From 74e4ed9727b3c0414c350133564619ae2815b0d7 Mon Sep 17 00:00:00 2001
From: Marco Castelluccio <mcastelluccio@mozilla.com>
Date: Wed, 2 Oct 2019 22:13:19 +0000
Subject: [PATCH] Bug 1452123 [wpt PR 9955] - Sync mozilla reftests as of
 2018-03-09, a=testonly

Automatic update from web-platform-testsSync Mozilla tests as of https://hg.mozilla.org/mozilla-central/rev/415e9b18ca2a1532086d5e2d5d21343cd004b5fd .

This commit contains a single change:
* [bug 1444136](https://bugzilla.mozilla.org/show_bug.cgi?id=1444136) by me, already reviewed by gsnedders.  Fixes #9912.

--
Remove entries from the lint whitelist that are fixed by the fix for #9912.

wpt-commits: a94171ad6309b41271b08553302d11a2b544bb51, 27b759e2d99020a09911d252c953777ae150e381
wpt-pr: 9955
wpt-commits: a94171ad6309b41271b08553302d11a2b544bb51, 27b759e2d99020a09911d252c953777ae150e381
wpt-pr: 9955

UltraBlame original commit: 9011794a980089e9568bb1034f5dc7d4b34c391c
---
 testing/web-platform/meta/MANIFEST.json       | 198 +++++++++---------
 .../background-repeat-round-1-ref.html        |  32 +++
 .../background-repeat-round-1a.html           |  33 +++
 .../background-repeat-round-1b.html           |  33 +++
 .../background-repeat-round-1c.html           |  34 +++
 .../background-repeat-round-1d.html           |  34 +++
 .../background-repeat-round-1e.html           |  34 +++
 .../background-repeat-round-2-ref.html        |  31 +++
 .../background/background-repeat-round-2.html |  33 +++
 .../background-repeat-round-3-ref.html        |  31 +++
 .../background/background-repeat-round-3.html |  34 +++
 .../background-repeat-round-4-ref.html        |  33 +++
 .../background/background-repeat-round-4.html |  36 ++++
 .../background-repeat-space-1-ref.html        |  68 ++++++
 .../background-repeat-space-10-ref.html       |  41 ++++
 .../background-repeat-space-10.html           |  25 +++
 .../background-repeat-space-1a.html           |  34 +++
 .../background-repeat-space-1b.html           |  35 ++++
 .../background-repeat-space-1c.html           |  34 +++
 .../background-repeat-space-2-ref.html        |  32 +++
 .../background/background-repeat-space-2.html |  36 ++++
 .../background-repeat-space-3-ref.html        |  80 +++++++
 .../background/background-repeat-space-3.html |  64 ++++++
 .../background-repeat-space-4-ref.html        |  58 +++++
 .../background/background-repeat-space-4.html |  34 +++
 .../background-repeat-space-5-ref.html        |  58 +++++
 .../background/background-repeat-space-5.html |  34 +++
 .../background-repeat-space-6-ref.html        |  61 ++++++
 .../background/background-repeat-space-6.html |  35 ++++
 .../background-repeat-space-7-ref.html        |  61 ++++++
 .../background/background-repeat-space-7.html |  35 ++++
 .../background-repeat-space-8-ref.html        |  34 +++
 .../background/background-repeat-space-8.html |  35 ++++
 .../background-repeat-space-9-ref.html        |  41 ++++
 .../background/background-repeat-space-9.html |  25 +++
 .../border-image-repeat-round-1-ref.html      | 100 +++++++++
 .../border-image-repeat-round-1.html          |  27 +++
 .../border-image-repeat-round-2-ref.html      | 100 +++++++++
 .../border-image-repeat-round-2.html          |  27 +++
 .../border-image-repeat-space-1-ref.html      |  96 +++++++++
 .../border-image-repeat-space-1.html          |  27 +++
 .../border-image-repeat-space-2-ref.html      |  56 +++++
 .../border-image-repeat-space-2.html          |  27 +++
 .../border-image-repeat-space-3-ref.html      | 136 ++++++++++++
 .../border-image-repeat-space-3.html          |  27 +++
 .../border-image-repeat-space-4-ref-1.html    |  97 +++++++++
 .../border-image-repeat-space-4-ref-2.html    |  24 +++
 .../border-image-repeat-space-4.html          |  27 +++
 .../border-image-repeat-space-5-ref-1.html    | 177 ++++++++++++++++
 .../border-image-repeat-space-5-ref-2.html    |  24 +++
 .../border-image-repeat-space-5.html          |  27 +++
 .../border-image-repeat-space-6-ref.html      | 101 +++++++++
 .../border-image-repeat-space-6.html          |  27 +++
 .../border-image-repeat-space-7-ref.html      | 164 +++++++++++++++
 .../border-image-repeat-space-7.html          |  27 +++
 .../background/support/aqua-yellow-32x32.png  | Bin 0 -> 156 bytes
 .../background/support/aqua-yellow-37x37.png  | Bin 0 -> 287 bytes
 .../background/support/border.png             | Bin 0 -> 849 bytes
 .../background/support/reticule-bl.png        | Bin 0 -> 123 bytes
 .../background/support/reticule-bo.png        | Bin 0 -> 134 bytes
 .../background/support/reticule-br.png        | Bin 0 -> 121 bytes
 .../background/support/reticule-ct.png        | Bin 0 -> 127 bytes
 .../background/support/reticule-le.png        | Bin 0 -> 128 bytes
 .../background/support/reticule-ri.png        | Bin 0 -> 130 bytes
 .../background/support/reticule-tl.png        | Bin 0 -> 125 bytes
 .../background/support/reticule-to.png        | Bin 0 -> 128 bytes
 .../background/support/reticule-tr.png        | Bin 0 -> 126 bytes
 .../background/support/reticule.png           | Bin 0 -> 202 bytes
 testing/web-platform/tests/lint.whitelist     |  13 --
 69 files changed, 2775 insertions(+), 112 deletions(-)
 create mode 100644 testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-round-1-ref.html
 create mode 100644 testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-round-1a.html
 create mode 100644 testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-round-1b.html
 create mode 100644 testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-round-1c.html
 create mode 100644 testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-round-1d.html
 create mode 100644 testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-round-1e.html
 create mode 100644 testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-round-2-ref.html
 create mode 100644 testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-round-2.html
 create mode 100644 testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-round-3-ref.html
 create mode 100644 testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-round-3.html
 create mode 100644 testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-round-4-ref.html
 create mode 100644 testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-round-4.html
 create mode 100644 testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-1-ref.html
 create mode 100644 testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-10-ref.html
 create mode 100644 testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-10.html
 create mode 100644 testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-1a.html
 create mode 100644 testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-1b.html
 create mode 100644 testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-1c.html
 create mode 100644 testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-2-ref.html
 create mode 100644 testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-2.html
 create mode 100644 testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-3-ref.html
 create mode 100644 testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-3.html
 create mode 100644 testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-4-ref.html
 create mode 100644 testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-4.html
 create mode 100644 testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-5-ref.html
 create mode 100644 testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-5.html
 create mode 100644 testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-6-ref.html
 create mode 100644 testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-6.html
 create mode 100644 testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-7-ref.html
 create mode 100644 testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-7.html
 create mode 100644 testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-8-ref.html
 create mode 100644 testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-8.html
 create mode 100644 testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-9-ref.html
 create mode 100644 testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-9.html
 create mode 100644 testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-round-1-ref.html
 create mode 100644 testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-round-1.html
 create mode 100644 testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-round-2-ref.html
 create mode 100644 testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-round-2.html
 create mode 100644 testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-space-1-ref.html
 create mode 100644 testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-space-1.html
 create mode 100644 testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-space-2-ref.html
 create mode 100644 testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-space-2.html
 create mode 100644 testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-space-3-ref.html
 create mode 100644 testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-space-3.html
 create mode 100644 testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-space-4-ref-1.html
 create mode 100644 testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-space-4-ref-2.html
 create mode 100644 testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-space-4.html
 create mode 100644 testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-space-5-ref-1.html
 create mode 100644 testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-space-5-ref-2.html
 create mode 100644 testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-space-5.html
 create mode 100644 testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-space-6-ref.html
 create mode 100644 testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-space-6.html
 create mode 100644 testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-space-7-ref.html
 create mode 100644 testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-space-7.html
 create mode 100644 testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/support/aqua-yellow-32x32.png
 create mode 100644 testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/support/aqua-yellow-37x37.png
 create mode 100644 testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/support/border.png
 create mode 100644 testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/support/reticule-bl.png
 create mode 100644 testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/support/reticule-bo.png
 create mode 100644 testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/support/reticule-br.png
 create mode 100644 testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/support/reticule-ct.png
 create mode 100644 testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/support/reticule-le.png
 create mode 100644 testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/support/reticule-ri.png
 create mode 100644 testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/support/reticule-tl.png
 create mode 100644 testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/support/reticule-to.png
 create mode 100644 testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/support/reticule-tr.png
 create mode 100644 testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/support/reticule.png

diff --git a/testing/web-platform/meta/MANIFEST.json b/testing/web-platform/meta/MANIFEST.json
index e33485aadd7a..81fd79b96dd0 100644
--- a/testing/web-platform/meta/MANIFEST.json
+++ b/testing/web-platform/meta/MANIFEST.json
@@ -265217,16 +265217,6 @@
      {}
     ]
    ],
-   "css/vendor-imports/mozilla/mozilla-central-reftests/background/aqua-yellow-32x32.png": [
-    [
-     {}
-    ]
-   ],
-   "css/vendor-imports/mozilla/mozilla-central-reftests/background/aqua-yellow-37x37.png": [
-    [
-     {}
-    ]
-   ],
    "css/vendor-imports/mozilla/mozilla-central-reftests/background/background-attachment-fixed-inside-transform-1-ref.html": [
     [
      {}
@@ -265352,62 +265342,72 @@
      {}
     ]
    ],
-   "css/vendor-imports/mozilla/mozilla-central-reftests/background/border.png": [
+   "css/vendor-imports/mozilla/mozilla-central-reftests/background/reftest.list": [
+    [
+     {}
+    ]
+   ],
+   "css/vendor-imports/mozilla/mozilla-central-reftests/background/support/aqua-yellow-32x32.png": [
     [
      {}
     ]
    ],
-   "css/vendor-imports/mozilla/mozilla-central-reftests/background/reftest.list": [
+   "css/vendor-imports/mozilla/mozilla-central-reftests/background/support/aqua-yellow-37x37.png": [
+    [
+     {}
+    ]
+   ],
+   "css/vendor-imports/mozilla/mozilla-central-reftests/background/support/border.png": [
     [
      {}
     ]
    ],
-   "css/vendor-imports/mozilla/mozilla-central-reftests/background/reticule-bl.png": [
+   "css/vendor-imports/mozilla/mozilla-central-reftests/background/support/reticule-bl.png": [
     [
      {}
     ]
    ],
-   "css/vendor-imports/mozilla/mozilla-central-reftests/background/reticule-bo.png": [
+   "css/vendor-imports/mozilla/mozilla-central-reftests/background/support/reticule-bo.png": [
     [
      {}
     ]
    ],
-   "css/vendor-imports/mozilla/mozilla-central-reftests/background/reticule-br.png": [
+   "css/vendor-imports/mozilla/mozilla-central-reftests/background/support/reticule-br.png": [
     [
      {}
     ]
    ],
-   "css/vendor-imports/mozilla/mozilla-central-reftests/background/reticule-ct.png": [
+   "css/vendor-imports/mozilla/mozilla-central-reftests/background/support/reticule-ct.png": [
     [
      {}
     ]
    ],
-   "css/vendor-imports/mozilla/mozilla-central-reftests/background/reticule-le.png": [
+   "css/vendor-imports/mozilla/mozilla-central-reftests/background/support/reticule-le.png": [
     [
      {}
     ]
    ],
-   "css/vendor-imports/mozilla/mozilla-central-reftests/background/reticule-ri.png": [
+   "css/vendor-imports/mozilla/mozilla-central-reftests/background/support/reticule-ri.png": [
     [
      {}
     ]
    ],
-   "css/vendor-imports/mozilla/mozilla-central-reftests/background/reticule-tl.png": [
+   "css/vendor-imports/mozilla/mozilla-central-reftests/background/support/reticule-tl.png": [
     [
      {}
     ]
    ],
-   "css/vendor-imports/mozilla/mozilla-central-reftests/background/reticule-to.png": [
+   "css/vendor-imports/mozilla/mozilla-central-reftests/background/support/reticule-to.png": [
     [
      {}
     ]
    ],
-   "css/vendor-imports/mozilla/mozilla-central-reftests/background/reticule-tr.png": [
+   "css/vendor-imports/mozilla/mozilla-central-reftests/background/support/reticule-tr.png": [
     [
      {}
     ]
    ],
-   "css/vendor-imports/mozilla/mozilla-central-reftests/background/reticule.png": [
+   "css/vendor-imports/mozilla/mozilla-central-reftests/background/support/reticule.png": [
     [
      {}
     ]
@@ -390990,7 +390990,7 @@
    "support"
   ],
   "./lint.whitelist": [
-   "f99ce1b3cf312caac08a8a8bb6a970ba00e28160",
+   "82fc9107178a6f9aef6c978ad51afe2370c92de1",
    "support"
   ],
   "./serve.py": [
@@ -536605,14 +536605,6 @@
    "0332d163ba2a010b5a8102cf23d220342e007170",
    "support"
   ],
-  "css/vendor-imports/mozilla/mozilla-central-reftests/background/aqua-yellow-32x32.png": [
-   "a4c3777cf587ade235c71b27144eae3f307deb05",
-   "support"
-  ],
-  "css/vendor-imports/mozilla/mozilla-central-reftests/background/aqua-yellow-37x37.png": [
-   "fc2d8a4c94a5a7c19344d5fdeb6f2e0c97e0ea56",
-   "support"
-  ],
   "css/vendor-imports/mozilla/mozilla-central-reftests/background/background-attachment-fixed-inside-transform-1-ref.html": [
    "ac4a007e9956b008807349d6fb1a5e1d04fa70b0",
    "support"
@@ -536622,139 +536614,139 @@
    "reftest"
   ],
   "css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-round-1-ref.html": [
-   "29441a01afe2699a04c4d5ba99acd6b62dc5f96b",
+   "527a9e170665067a0be9c80d5a03e5e3762fb5d0",
    "support"
   ],
   "css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-round-1a.html": [
-   "809a3f95a27d65858ffb02e117730bb42736fb80",
+   "2e63657cd77715a2592071cecfe9a8b92ee25036",
    "reftest"
   ],
   "css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-round-1b.html": [
-   "4b52973ae50842378ad37f0e6f34446848730f25",
+   "bb8ecbae4c8679c8027dff5b2284a1ce02a8825c",
    "reftest"
   ],
   "css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-round-1c.html": [
-   "de76776ca724ba92bc74aef65ea735dfcb6cad93",
+   "e5ce00218cb4de53c98695e461fde4666ea7e54b",
    "reftest"
   ],
   "css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-round-1d.html": [
-   "cddb6225b1a0fba923df44c822a7e14c8dc83aec",
+   "07c2fd2fa564bee8fff8bcee5aea4088d4bc7a7d",
    "reftest"
   ],
   "css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-round-1e.html": [
-   "f09086d194fd800f60e87a8a9f173eb133975c8b",
+   "04449b9807337732367a4433a212d9d8a1f54846",
    "reftest"
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   "css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-round-2-ref.html": [
-   "ab1bd133eac072e7653bbb7ebdfb3ad25378150f",
+   "8b6156e33c36a7ff6100e4083888377233b03491",
    "support"
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   "css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-round-2.html": [
-   "451bbbdc1feaf8518f771929f1ba4fca98ca4561",
+   "6130e53d76ebddd25e67dd130bd5a69fe333de70",
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   "css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-round-3-ref.html": [
-   "e4ffb716a411e30f039b5b94c655b236285c7d5b",
+   "0ca8f34ec1bc5b92e99948479ed558cb37cde19f",
    "support"
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   "css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-round-3.html": [
-   "229eda2d0edd98f4fa1bce52652d3df3b8e25c57",
+   "68966b45847d9932aad774321a99aa79f15dbf81",
    "reftest"
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   "css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-round-4-ref.html": [
-   "a50788fabe6e09abb218f6e3c273674c3f427e98",
+   "985c3cdcb1995fe748b42a3a6225e94ce7faf8fc",
    "support"
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   "css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-round-4.html": [
-   "e670e2567908a5d95ef87fbf04f2099301dd837f",
+   "22f985cdcdd345f826396b4d0ea7078c015f3e2a",
    "reftest"
   ],
   "css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-1-ref.html": [
-   "47e4c35735316ccd63365dc393edb54b276ececd",
+   "74254368494287e55235f772459e658cab2c33c8",
    "support"
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   "css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-10-ref.html": [
-   "c5009e3b890996defe6a3ee814b0a7a608ccc6d1",
+   "bad3ec7df4823b5cf9d2f381d7786743c0bfb8b7",
    "support"
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    "support"
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diff --git a/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-round-1-ref.html b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-round-1-ref.html
new file mode 100644
index 000000000000..ecd58d762f9b
--- /dev/null
+++ b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-round-1-ref.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>CSS Background: background-repeat: background image repeat</title>
+    <link rel="author" title="Ethan Lin" href="mailto:ethlin@mozilla.com">
+    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
+    <style type="text/css">
+      .outer {
+        width: 72px;
+        height: 72px;
+        border: 1px solid black;
+        background-image: url(support/aqua-yellow-32x32.png);
+        background-size: 36px 36px;
+        background-repeat: repeat;
+      }
+      .outer_gradient {
+        width: 72px;
+        height: 72px;
+        border: 1px solid black;
+        background-size: 36px 36px;
+        background-image: linear-gradient(to top left, red, green);
+        background-repeat: repeat;
+      }
+      </style>
+    </head>
+    <body>
+      <div class="outer"></div>
+      <div class="outer_gradient"></div>
+    </body>
+</html>
+
diff --git a/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-round-1a.html b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-round-1a.html
new file mode 100644
index 000000000000..6717ce1b3485
--- /dev/null
+++ b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-round-1a.html
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>CSS Background: background-repeat: background image round</title>
+    <link rel="author" title="Ethan Lin" href="mailto:ethlin@mozilla.com">
+    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
+    <link rel="help" href="https://www.w3.org/TR/css3-background/#background-repeat">
+    <link rel="match" href="background-repeat-round-1-ref.html">
+    <meta name="assert" content="Test checks whether background-repeat: 'round' works correctly or not.">
+    <style type="text/css">
+      .outer {
+        width: 72px;
+        height: 72px;
+        border: 1px solid black;
+        background-image: url(support/aqua-yellow-32x32.png);
+        background-repeat: round;
+      }
+      .outer_gradient {
+        width: 72px;
+        height: 72px;
+        border: 1px solid black;
+        background-size: 32px 32px;
+        background-image: linear-gradient(to top left, red, green);
+        background-repeat: round;
+      }
+    </style>
+  </head>
+  <body>
+    <div class="outer"></div>
+    <div class="outer_gradient"></div>
+  </body>
+</html>
diff --git a/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-round-1b.html b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-round-1b.html
new file mode 100644
index 000000000000..b3e1e9684b85
--- /dev/null
+++ b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-round-1b.html
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>CSS Background: background-repeat: background image round</title>
+    <link rel="author" title="Ethan Lin" href="mailto:ethlin@mozilla.com">
+    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
+    <link rel="help" href="https://www.w3.org/TR/css3-background/#background-repeat">
+    <link rel="match" href="background-repeat-round-1-ref.html">
+    <meta name="assert" content="Test checks whether background-repeat: 'round round' works correctly or not.">
+    <style type="text/css">
+      .outer {
+        width: 72px;
+        height: 72px;
+        border: 1px solid black;
+        background-image: url(support/aqua-yellow-32x32.png);
+        background-repeat: round round;
+      }
+      .outer_gradient {
+        width: 72px;
+        height: 72px;
+        border: 1px solid black;
+        background-size: 32px 32px;
+        background-image: linear-gradient(to top left, red, green);
+        background-repeat: round round;
+      }
+    </style>
+  </head>
+  <body>
+    <div class="outer"></div>
+    <div class="outer_gradient"></div>
+  </body>
+</html>
diff --git a/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-round-1c.html b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-round-1c.html
new file mode 100644
index 000000000000..3fcfd80b1c79
--- /dev/null
+++ b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-round-1c.html
@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>CSS Background: background-repeat: background image round</title>
+    <link rel="author" title="Ethan Lin" href="mailto:ethlin@mozilla.com">
+    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
+    <link rel="help" href="https://www.w3.org/TR/css3-background/#background-repeat">
+    <link rel="match" href="background-repeat-round-1-ref.html">
+    <meta name="assert" content="Test checks whether background-repeat: 'repeat round' works correctly or not.">
+    <style type="text/css">
+      .outer {
+        width: 72px;
+        height: 72px;
+        border: 1px solid black;
+        background-size: 36px 36px;
+        background-image: url(support/aqua-yellow-32x32.png);
+        background-repeat: repeat round;
+      }
+      .outer_gradient {
+        width: 72px;
+        height: 72px;
+        border: 1px solid black;
+        background-size: 36px 36px;
+        background-image: linear-gradient(to top left, red, green);
+        background-repeat: repeat round;
+      }
+    </style>
+  </head>
+  <body>
+    <div class="outer"></div>
+    <div class="outer_gradient"></div>
+  </body>
+</html>
diff --git a/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-round-1d.html b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-round-1d.html
new file mode 100644
index 000000000000..69045cf605a2
--- /dev/null
+++ b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-round-1d.html
@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>CSS Background: background-repeat: background image round</title>
+    <link rel="author" title="Ethan Lin" href="mailto:ethlin@mozilla.com">
+    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
+    <link rel="help" href="https://www.w3.org/TR/css3-background/#background-repeat">
+    <link rel="match" href="background-repeat-round-1-ref.html">
+    <meta name="assert" content="Test checks whether background-repeat: 'round repeat' works correctly or not.">
+    <style type="text/css">
+      .outer {
+        width: 72px;
+        height: 72px;
+        border: 1px solid black;
+        background-size: 32px 36px;
+        background-image: url(support/aqua-yellow-32x32.png);
+        background-repeat: round repeat;
+      }
+      .outer_gradient {
+        width: 72px;
+        height: 72px;
+        border: 1px solid black;
+        background-size: 32px 36px;
+        background-image: linear-gradient(to top left, red, green);
+        background-repeat: round repeat;
+      }
+    </style>
+  </head>
+  <body>
+    <div class="outer"></div>
+    <div class="outer_gradient"></div>
+  </body>
+</html>
diff --git a/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-round-1e.html b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-round-1e.html
new file mode 100644
index 000000000000..5fd4973dcd8e
--- /dev/null
+++ b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-round-1e.html
@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>CSS Background: background-repeat: background image round</title>
+    <link rel="author" title="Ethan Lin" href="mailto:ethlin@mozilla.com">
+    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
+    <link rel="help" href="https://www.w3.org/TR/css3-background/#background-repeat">
+    <link rel="match" href="background-repeat-round-1-ref.html">
+    <meta name="assert" content="Test checks whether background-repeat: 'repeat round' works correctly or not.">
+    <style type="text/css">
+      .outer {
+        width: 72px;
+        height: 72px;
+        border: 1px solid black;
+        background-size: 36px 32px;
+        background-image: url(support/aqua-yellow-32x32.png);
+        background-repeat: repeat round;
+      }
+      .outer_gradient {
+        width: 72px;
+        height: 72px;
+        border: 1px solid black;
+        background-size: 36px 32px;
+        background-image: linear-gradient(to top left, red, green);
+        background-repeat: repeat round;
+      }
+    </style>
+  </head>
+  <body>
+    <div class="outer"></div>
+    <div class="outer_gradient"></div>
+  </body>
+</html>
diff --git a/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-round-2-ref.html b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-round-2-ref.html
new file mode 100644
index 000000000000..b530e61a6b53
--- /dev/null
+++ b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-round-2-ref.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>CSS Background: background-repeat: background image repeat</title>
+    <link rel="author" title="Ethan Lin" href="mailto:ethlin@mozilla.com">
+    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
+    <style type="text/css">
+    .outer {
+      width: 72px;
+      height: 72px;
+      border: 1px solid black;
+      background-image: url(support/aqua-yellow-32x32.png);
+      background-size: 36px 36px;
+      background-repeat: repeat-x;
+    }
+    .outer_gradient {
+      width: 72px;
+      height: 72px;
+      border: 1px solid black;
+      background-image: linear-gradient(to top left, red, green);
+      background-size: 36px 36px;
+      background-repeat: repeat-x;
+    }
+    </style>
+    </head>
+    <body>
+      <div class="outer"></div>
+      <div class="outer_gradient"></div>
+    </body>
+</html>
diff --git a/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-round-2.html b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-round-2.html
new file mode 100644
index 000000000000..702931abe849
--- /dev/null
+++ b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-round-2.html
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>CSS Background: background-repeat: background image round no-repeat</title>
+    <link rel="author" title="Ethan Lin" href="mailto:ethlin@mozilla.com">
+    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
+    <link rel="help" href="https://www.w3.org/TR/css3-background/#background-repeat">
+    <link rel="match" href="background-repeat-round-2-ref.html">
+    <meta name="assert" content="Test checks whether background-repeat: 'round no-repeat' works correctly or not.">
+    <style type="text/css">
+    .outer {
+      width: 72px;
+      height: 72px;
+      border: 1px solid black;
+      background-image: url(support/aqua-yellow-32x32.png);
+      background-repeat: round no-repeat;
+    }
+    .outer_gradient {
+      width: 72px;
+      height: 72px;
+      border: 1px solid black;
+      background-size: 32px 36px;
+      background-image: linear-gradient(to top left, red, green);
+      background-repeat: round no-repeat;
+    }
+    </style>
+  </head>
+  <body>
+    <div class="outer"></div>
+    <div class="outer_gradient"></div>
+  </body>
+</html>
diff --git a/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-round-3-ref.html b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-round-3-ref.html
new file mode 100644
index 000000000000..e44cecd8f5c3
--- /dev/null
+++ b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-round-3-ref.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>CSS Background: background-repeat: background image repeat</title>
+    <link rel="author" title="Ethan Lin" href="mailto:ethlin@mozilla.com">
+    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
+    <style type="text/css">
+      #outer {
+        width: 72px;
+        height: 72px;
+        border: 1px solid black;
+        background-image: url(support/aqua-yellow-32x32.png);
+        background-size: 36px 36px;
+        background-repeat: repeat-y;
+      }
+      #outer_gradient {
+        width: 72px;
+        height: 72px;
+        border: 1px solid black;
+        background-image: linear-gradient(to top left, red, green);
+        background-size: 36px 36px;
+        background-repeat: repeat-y;
+      }
+    </style>
+    </head>
+    <body>
+      <div id="outer"><div id=inner></div></div>
+      <div id="outer_gradient"><div id=inner></div></div>
+    </body>
+</html>
diff --git a/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-round-3.html b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-round-3.html
new file mode 100644
index 000000000000..c3b5e2b2d003
--- /dev/null
+++ b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-round-3.html
@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>CSS Background: background-repeat: background image no-repeat round</title>
+    <link rel="author" title="Ethan Lin" href="mailto:ethlin@mozilla.com">
+    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
+    <link rel="help" href="https://www.w3.org/TR/css3-background/#background-repeat">
+    <link rel="match" href="background-repeat-round-3-ref.html">
+    <meta name="assert" content="Test checks whether background-repeat: 'no-repeat round' works correctly or not.">
+    <style type="text/css">
+      .outer {
+        width: 72px;
+        height: 72px;
+        border: 1px solid black;
+        background-image: url(support/aqua-yellow-32x32.png);
+        background-size: 36px auto;
+        background-repeat: no-repeat round;
+      }
+      .outer_gradient {
+        width: 72px;
+        height: 72px;
+        border: 1px solid black;
+        background-image: linear-gradient(to top left, red, green);
+        background-size: 36px 32px;
+        background-repeat: no-repeat round;
+      }
+    </style>
+  </head>
+  <body>
+    <div class="outer"></div>
+    <div class="outer_gradient"></div>
+  </body>
+</html>
diff --git a/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-round-4-ref.html b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-round-4-ref.html
new file mode 100644
index 000000000000..8139ace8dad4
--- /dev/null
+++ b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-round-4-ref.html
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>CSS Background: background-repeat: background image repeat with specified position</title>
+    <link rel="author" title="Ethan Lin" href="mailto:ethlin@mozilla.com">
+    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
+    <style type="text/css">
+      .outer {
+        width: 72px;
+        height: 72px;
+        border: 1px solid black;
+        background-image: url(support/aqua-yellow-32x32.png);
+        background-size: 36px 36px;
+        background-repeat: repeat;
+        background-position: 5px 5px;
+      }
+      .outer_gradient {
+        width: 72px;
+        height: 72px;
+        border: 1px solid black;
+        background-image: linear-gradient(to top left, red, green);
+        background-size: 36px 36px;
+        background-repeat: repeat;
+        background-position: 5px 5px;
+      }
+    </style>
+    </head>
+    <body>
+      <div class="outer"></div>
+      <div class="outer_gradient"></div>
+    </body>
+</html>
diff --git a/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-round-4.html b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-round-4.html
new file mode 100644
index 000000000000..be1a4c8ae9ce
--- /dev/null
+++ b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-round-4.html
@@ -0,0 +1,36 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>CSS Background: background-repeat: background image round with specified position</title>
+    <link rel="author" title="Ethan Lin" href="mailto:ethlin@mozilla.com">
+    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
+    <link rel="help" href="https://www.w3.org/TR/css3-background/#background-repeat">
+    <link rel="match" href="background-repeat-round-4-ref.html">
+    <meta name="assert" content="Test checks whether background-repeat: 'round' works correctly or not.">
+    <style type="text/css">
+      #outer {
+        width: 72px;
+        height: 72px;
+        border: 1px solid black;
+        background-image: url(support/aqua-yellow-32x32.png);
+        background-repeat: round;
+        background-position: 5px 5px;
+      }
+      #outer_gradient {
+        width: 72px;
+        height: 72px;
+        border: 1px solid black;
+        background-size: 32px 32px;
+        background-image: linear-gradient(to top left, red, green);
+        background-repeat: round;
+        background-position: 5px 5px;
+      }
+    </style>
+  </head>
+  <body>
+    <div id="outer"></div>
+    <div id="outer_gradient"></div>
+  </body>
+</html>
+
diff --git a/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-1-ref.html b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-1-ref.html
new file mode 100644
index 000000000000..11ea2c7bc1e4
--- /dev/null
+++ b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-1-ref.html
@@ -0,0 +1,68 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>CSS Background: background-repeat: position background image</title>
+    <link rel="author" title="Ethan Lin" href="mailto:ethlin@mozilla.com">
+    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
+    <style type="text/css">
+      .outer
+      {
+        border: 1px solid black;
+        width: 106px;
+        height: 106px;
+        display: flex;
+        justify-content: space-between;
+        align-content: space-between;
+        flex-wrap: wrap;
+      }
+      .inner
+      {
+        height: 32px;
+        width: 32px;
+        background-image: url(support/aqua-yellow-32x32.png);
+      }
+      .outer_gradient
+      {
+        border: 1px solid black;
+        width: 106px;
+        height: 106px;
+        display: flex;
+        justify-content: space-between;
+        align-content: space-between;
+        flex-wrap: wrap;
+      }
+      .inner_gradient
+      {
+        height: 32px;
+        width: 32px;
+        background-image: linear-gradient(to top left, red, green);
+      }
+    </style>
+  </head>
+  <body>
+    <div class="outer">
+      <div class="inner"></div>
+      <div class="inner"></div>
+      <div class="inner"></div>
+      <div class="inner"></div>
+      <div class="inner"></div>
+      <div class="inner"></div>
+      <div class="inner"></div>
+      <div class="inner"></div>
+      <div class="inner"></div>
+    </div>
+    <div class="outer_gradient">
+      <div class="inner_gradient"></div>
+      <div class="inner_gradient"></div>
+      <div class="inner_gradient"></div>
+      <div class="inner_gradient"></div>
+      <div class="inner_gradient"></div>
+      <div class="inner_gradient"></div>
+      <div class="inner_gradient"></div>
+      <div class="inner_gradient"></div>
+      <div class="inner_gradient"></div>
+    </div>
+  </body>
+</html>
+
diff --git a/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-10-ref.html b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-10-ref.html
new file mode 100644
index 000000000000..f4c2b7c18e21
--- /dev/null
+++ b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-10-ref.html
@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>CSS Background: background-repeat: position background image</title>
+    <link rel="author" title="Ethan Lin" href="mailto:ethlin@mozilla.com">
+    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
+    <style type="text/css">
+      .outer
+      {
+        border: 1px solid black;
+        width: 96px;
+        height: 106px;
+        display: flex;
+        justify-content: space-between;
+        align-content: space-between;
+        flex-wrap: wrap;
+      }
+      .inner
+      {
+        height: 32px;
+        width: 32px;
+        background-image: url(support/aqua-yellow-32x32.png);
+      }
+    </style>
+  </head>
+  <body>
+    <div class="outer">
+      <div class="inner"></div>
+      <div class="inner"></div>
+      <div class="inner"></div>
+      <div class="inner"></div>
+      <div class="inner"></div>
+      <div class="inner"></div>
+      <div class="inner"></div>
+      <div class="inner"></div>
+      <div class="inner"></div>
+    </div>
+  </body>
+</html>
+
diff --git a/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-10.html b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-10.html
new file mode 100644
index 000000000000..00205a938b81
--- /dev/null
+++ b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-10.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>CSS Background: background-repeat: background image space</title>
+    <link rel="author" title="Ethan Lin" href="mailto:ethlin@mozilla.com">
+    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
+    <link rel="help" href="https://www.w3.org/TR/css3-background/#background-repeat">
+    <link rel="match" href="background-repeat-space-10-ref.html">
+    <meta name="assert" content="Test checks whether background-repeat: 'space' works correctly or not.">
+    <style type="text/css">
+      .outer {
+        width: 96px;
+        height: 106px;
+        border: 1px solid black;
+        background-image: url(support/aqua-yellow-32x32.png);
+        background-repeat: space;
+      }
+    </style>
+  </head>
+  <body>
+    <div class="outer"></div>
+  </body>
+</html>
+
diff --git a/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-1a.html b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-1a.html
new file mode 100644
index 000000000000..e4376c6391d5
--- /dev/null
+++ b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-1a.html
@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>CSS Background: background-repeat: background image space</title>
+    <link rel="author" title="Ethan Lin" href="mailto:ethlin@mozilla.com">
+    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
+    <link rel="help" href="https://www.w3.org/TR/css3-background/#background-repeat">
+    <link rel="match" href="background-repeat-space-1-ref.html">
+    <meta name="assert" content="Test checks whether background-repeat: 'space' works correctly or not.">
+    <style type="text/css">
+      .outer {
+        width: 106px;
+        height: 106px;
+        border: 1px solid black;
+        background-image: url(support/aqua-yellow-32x32.png);
+        background-repeat: space;
+      }
+      .outer_gradient {
+        width: 106px;
+        height: 106px;
+        border: 1px solid black;
+        background-size: 32px 32px;
+        background-image: linear-gradient(to top left, red, green);
+        background-repeat: space;
+      }
+    </style>
+  </head>
+  <body>
+    <div class="outer"></div>
+    <div class="outer_gradient"></div>
+  </body>
+</html>
+
diff --git a/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-1b.html b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-1b.html
new file mode 100644
index 000000000000..55bc6dc704dc
--- /dev/null
+++ b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-1b.html
@@ -0,0 +1,35 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>CSS Background: background-repeat: background image space with position</title>
+    <link rel="author" title="Ethan Lin" href="mailto:ethlin@mozilla.com">
+    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
+    <link rel="help" href="https://www.w3.org/TR/css3-background/#background-repeat">
+    <link rel="match" href="background-repeat-space-1-ref.html">
+    <meta name="assert" content="Test checks whether background-repeat: 'space' works correctly or not.">
+    <style type="text/css">
+      .outer {
+        width: 106px;
+        height: 106px;
+        border: 1px solid black;
+        background-image: url(support/aqua-yellow-32x32.png);
+        background-position: 15px 15px;
+        background-repeat: space;
+      }
+      .outer_gradient {
+        width: 106px;
+        height: 106px;
+        border: 1px solid black;
+        background-size: 32px 32px;
+        background-image: linear-gradient(to top left, red, green);
+        background-position: 15px 15px;
+        background-repeat: space;
+      }
+    </style>
+  </head>
+  <body>
+    <div class="outer"></div>
+    <div class="outer_gradient"></div>
+  </body>
+</html>
diff --git a/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-1c.html b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-1c.html
new file mode 100644
index 000000000000..27470f9e0c07
--- /dev/null
+++ b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-1c.html
@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>CSS Background: background-repeat: background image space</title>
+    <link rel="author" title="Ethan Lin" href="mailto:ethlin@mozilla.com">
+    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
+    <link rel="help" href="https://www.w3.org/TR/css3-background/#background-repeat">
+    <link rel="match" href="background-repeat-space-1-ref.html">
+    <meta name="assert" content="Test checks whether background-repeat: 'space space' works correctly or not.">
+    <style type="text/css">
+      .outer {
+        width: 106px;
+        height: 106px;
+        border: 1px solid black;
+        background-image: url(support/aqua-yellow-32x32.png);
+        background-repeat: space space;
+      }
+      .outer_gradient {
+        width: 106px;
+        height: 106px;
+        border: 1px solid black;
+        background-size: 32px 32px;
+        background-image: linear-gradient(to top left, red, green);
+        background-repeat: space space;
+      }
+    </style>
+  </head>
+  <body>
+    <div class="outer"></div>
+    <div class="outer_gradient"></div>
+  </body>
+</html>
+
diff --git a/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-2-ref.html b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-2-ref.html
new file mode 100644
index 000000000000..5dbd30d550ae
--- /dev/null
+++ b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-2-ref.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>CSS Background: background-repeat: position background image</title>
+    <link rel="author" title="Ethan Lin" href="mailto:ethlin@mozilla.com">
+    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
+    <style type="text/css">
+      .outer {
+        width: 48px;
+        height: 48px;
+        border: 1px solid black;
+        background-image: url(support/aqua-yellow-32x32.png);
+        background-repeat: no-repeat;
+        background-position: 5px 5px;
+      }
+      .outer_gradient {
+        width: 48px;
+        height: 48px;
+        border: 1px solid black;
+        background-size: 32px 32px;
+        background-image: linear-gradient(to top left, red, green);
+        background-repeat: no-repeat;
+        background-position: 5px 5px;
+      }
+    </style>
+  </head>
+  <body>
+    <div class="outer"></div>
+    <div class="outer_gradient"></div>
+  </body>
+</html>
diff --git a/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-2.html b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-2.html
new file mode 100644
index 000000000000..ac9664482c57
--- /dev/null
+++ b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-2.html
@@ -0,0 +1,36 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>CSS Background: background-repeat: background image round with specified position</title>
+    <link rel="author" title="Ethan Lin" href="mailto:ethlin@mozilla.com">
+    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
+    <link rel="help" href="https://www.w3.org/TR/css3-background/#background-repeat">
+    <link rel="match" href="background-repeat-space-2-ref.html">
+    <meta name="assert" content="Test checks whether background-repeat: 'space' works correctly or not.">
+    <style type="text/css">
+      .outer {
+        width: 48px;
+        height: 48px;
+        border: 1px solid black;
+        background-image: url(support/aqua-yellow-32x32.png);
+        background-repeat: space;
+        background-position: 5px 5px;
+      }
+      .outer_gradient {
+        width: 48px;
+        height: 48px;
+        border: 1px solid black;
+        background-size: 32px 32px;
+        background-image: linear-gradient(to top left, red, green);
+        background-repeat: space;
+        background-position: 5px 5px;
+      }
+    </style>
+  </head>
+  <body>
+    <div class="outer"></div>
+    <div class="outer_gradient"></div>
+  </body>
+</html>
+
diff --git a/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-3-ref.html b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-3-ref.html
new file mode 100644
index 000000000000..f132f2eceac7
--- /dev/null
+++ b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-3-ref.html
@@ -0,0 +1,80 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>CSS Background: background-repeat: position background image</title>
+    <link rel="author" title="Ethan Lin" href="mailto:ethlin@mozilla.com">
+    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
+    <style type="text/css">
+      .outer1
+      {
+        border: 1px solid black;
+        width: 106px;
+        height: 106px;
+        display: flex;
+        justify-content: space-between;
+      }
+      .inner1
+      {
+        height: 32px;
+        width: 32px;
+        background-image: url(support/aqua-yellow-32x32.png);
+        margin-top: 40px;
+      }
+      .outer2
+      {
+        border: 1px solid black;
+        width: 106px;
+        height: 106px;
+        display: flex;
+        align-content: space-between;
+        flex-wrap: wrap;
+      }
+      .inner2
+      {
+        height: 32px;
+        width: 32px;
+        background-image: url(support/aqua-yellow-32x32.png);
+        margin-left: 40px;
+      }
+      .inner_gradient1
+      {
+        height: 32px;
+        width: 32px;
+        background-size: 32px 32px;
+        background-image: linear-gradient(to top left, red, green);
+        margin-top: 40px;
+      }
+      .inner_gradient2
+      {
+        height: 32px;
+        width: 32px;
+        background-size: 32px 32px;
+        background-image: linear-gradient(to top left, red, green);
+        margin-left: 40px;
+      }
+    </style>
+  </head>
+  <body>
+    <div class="outer1">
+      <div class="inner1"></div>
+      <div class="inner1"></div>
+      <div class="inner1"></div>
+    </div>
+    <div class="outer2">
+      <div class="inner2"></div>
+      <div class="inner2"></div>
+      <div class="inner2"></div>
+    </div>
+    <div class="outer1">
+      <div class="inner_gradient1"></div>
+      <div class="inner_gradient1"></div>
+      <div class="inner_gradient1"></div>
+    </div>
+    <div class="outer2">
+      <div class="inner_gradient2"></div>
+      <div class="inner_gradient2"></div>
+      <div class="inner_gradient2"></div>
+    </div>
+  </body>
+</html>
diff --git a/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-3.html b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-3.html
new file mode 100644
index 000000000000..9ea709b81f32
--- /dev/null
+++ b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-3.html
@@ -0,0 +1,64 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>CSS Background: background-repeat: background image round with specified position</title>
+    <link rel="author" title="Ethan Lin" href="mailto:ethlin@mozilla.com">
+    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
+    <link rel="help" href="https://www.w3.org/TR/css3-background/#background-repeat">
+    <link rel="match" href="background-repeat-space-3-ref.html">
+    <meta name="assert" content="Test checks whether background-repeat: 'no-repeat space' and 'space no-repeat' works correctly or not.">
+    <style type="text/css">
+      .outer {
+        width: 106px;
+        height: 106px;
+        border: 1px solid black;
+      }
+      .inner1 {
+        width: 106px;
+        height: 106px;
+        background-image: url(support/aqua-yellow-32x32.png);
+        background-repeat: space no-repeat;
+        background-position: 7px 40px;
+      }
+      .inner2 {
+        width: 106px;
+        height: 106px;
+        background-image: url(support/aqua-yellow-32x32.png);
+        background-repeat: no-repeat space;
+        background-position: 40px 7px;
+      }
+      .inner_gradient1 {
+        width: 106px;
+        height: 106px;
+        background-size: 32px 32px;
+        background-image: linear-gradient(to top left, red, green);
+        background-repeat: space no-repeat;
+        background-position: 7px 40px;
+      }
+      .inner_gradient2 {
+        width: 106px;
+        height: 106px;
+        background-size: 32px 32px;
+        background-image: linear-gradient(to top left, red, green);
+        background-repeat: no-repeat space;
+        background-position: 40px 7px;
+      }
+    </style>
+  </head>
+  <body>
+    <div class="outer">
+      <div class="inner1"></div>
+    </div>
+    <div class="outer">
+      <div class="inner2"></div>
+    </div>
+    <div class="outer">
+      <div class="inner_gradient1"></div>
+    </div>
+    <div class="outer">
+      <div class="inner_gradient2"></div>
+    </div>
+</body>
+</html>
+
diff --git a/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-4-ref.html b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-4-ref.html
new file mode 100644
index 000000000000..a375db50cd07
--- /dev/null
+++ b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-4-ref.html
@@ -0,0 +1,58 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>CSS Background: background-repeat: position background image</title>
+    <link rel="author" title="Ethan Lin" href="mailto:ethlin@mozilla.com">
+    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
+    <style type="text/css">
+      .outer
+      {
+        border: 1px solid black;
+        width: 96px;
+        height: 106px;
+        display: flex;
+        align-content: space-between;
+        flex-wrap: wrap;
+      }
+      .inner
+      {
+        height: 32px;
+        width: 32px;
+        background-image: url(support/aqua-yellow-32x32.png);
+      }
+      .inner_gradient
+      {
+        height: 32px;
+        width: 32px;
+        background-size: 32px 32px;
+        background-image: linear-gradient(to top left, red, green);
+      }
+    </style>
+  </head>
+  <body>
+    <div class="outer">
+      <div class="inner"></div>
+      <div class="inner"></div>
+      <div class="inner"></div>
+      <div class="inner"></div>
+      <div class="inner"></div>
+      <div class="inner"></div>
+      <div class="inner"></div>
+      <div class="inner"></div>
+      <div class="inner"></div>
+    </div>
+    <div class="outer">
+      <div class="inner_gradient"></div>
+      <div class="inner_gradient"></div>
+      <div class="inner_gradient"></div>
+      <div class="inner_gradient"></div>
+      <div class="inner_gradient"></div>
+      <div class="inner_gradient"></div>
+      <div class="inner_gradient"></div>
+      <div class="inner_gradient"></div>
+      <div class="inner_gradient"></div>
+    </div>
+  </body>
+</html>
+
diff --git a/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-4.html b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-4.html
new file mode 100644
index 000000000000..834381c76fec
--- /dev/null
+++ b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-4.html
@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>CSS Background: background-repeat: background image space</title>
+    <link rel="author" title="Ethan Lin" href="mailto:ethlin@mozilla.com">
+    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
+    <link rel="help" href="https://www.w3.org/TR/css3-background/#background-repeat">
+    <link rel="match" href="background-repeat-space-4-ref.html">
+    <meta name="assert" content="Test checks whether background-repeat: 'repeat space' works correctly or not.">
+    <style type="text/css">
+      .outer {
+        width: 96px;
+        height: 106px;
+        border: 1px solid black;
+        background-image: url(support/aqua-yellow-32x32.png);
+        background-repeat: repeat space;
+      }
+      .outer_graident {
+        width: 96px;
+        height: 106px;
+        border: 1px solid black;
+        background-size: 32px 32px;
+        background-image: linear-gradient(to top left, red, green);
+        background-repeat: repeat space;
+      }
+    </style>
+  </head>
+  <body>
+    <div class="outer"></div>
+    <div class="outer_graident"></div>
+  </body>
+</html>
+
diff --git a/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-5-ref.html b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-5-ref.html
new file mode 100644
index 000000000000..d9d3ca11842a
--- /dev/null
+++ b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-5-ref.html
@@ -0,0 +1,58 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>CSS Background: background-repeat: position background image</title>
+    <link rel="author" title="Ethan Lin" href="mailto:ethlin@mozilla.com">
+    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
+    <style type="text/css">
+      .outer
+      {
+        border: 1px solid black;
+        width: 106px;
+        height: 96px;
+        display: flex;
+        justify-content: space-between;
+        flex-wrap: wrap;
+      }
+      .inner
+      {
+        height: 32px;
+        width: 32px;
+        background-image: url(support/aqua-yellow-32x32.png);
+      }
+      .inner_gradient
+      {
+        height: 32px;
+        width: 32px;
+        background-size: 32px 32px;
+        background-image: linear-gradient(to top left, red, green);
+      }
+    </style>
+  </head>
+  <body>
+    <div class="outer">
+      <div class="inner"></div>
+      <div class="inner"></div>
+      <div class="inner"></div>
+      <div class="inner"></div>
+      <div class="inner"></div>
+      <div class="inner"></div>
+      <div class="inner"></div>
+      <div class="inner"></div>
+      <div class="inner"></div>
+    </div>
+    <div class="outer">
+      <div class="inner_gradient"></div>
+      <div class="inner_gradient"></div>
+      <div class="inner_gradient"></div>
+      <div class="inner_gradient"></div>
+      <div class="inner_gradient"></div>
+      <div class="inner_gradient"></div>
+      <div class="inner_gradient"></div>
+      <div class="inner_gradient"></div>
+      <div class="inner_gradient"></div>
+    </div>
+  </body>
+</html>
+
diff --git a/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-5.html b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-5.html
new file mode 100644
index 000000000000..0beca23d9640
--- /dev/null
+++ b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-5.html
@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>CSS Background: background-repeat: background image space</title>
+    <link rel="author" title="Ethan Lin" href="mailto:ethlin@mozilla.com">
+    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
+    <link rel="help" href="https://www.w3.org/TR/css3-background/#background-repeat">
+    <link rel="match" href="background-repeat-space-5-ref.html">
+    <meta name="assert" content="Test checks whether background-repeat: 'space repeat' works correctly or not.">
+    <style type="text/css">
+      .outer {
+        width: 106px;
+        height: 96px;
+        border: 1px solid black;
+        background-image: url(support/aqua-yellow-32x32.png);
+        background-repeat: space repeat;
+      }
+      .outer_gradient {
+        width: 106px;
+        height: 96px;
+        border: 1px solid black;
+        background-size: 32px 32px;
+        background-image: linear-gradient(to top left, red, green);
+        background-repeat: space repeat;
+      }
+    </style>
+  </head>
+  <body>
+    <div class="outer"></div>
+    <div class="outer_gradient"></div>
+  </body>
+</html>
+
diff --git a/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-6-ref.html b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-6-ref.html
new file mode 100644
index 000000000000..c07440184b6f
--- /dev/null
+++ b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-6-ref.html
@@ -0,0 +1,61 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>CSS Background: background-repeat: position background image</title>
+    <link rel="author" title="Ethan Lin" href="mailto:ethlin@mozilla.com">
+    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
+    <style type="text/css">
+      .outer
+      {
+        border: 1px solid black;
+        width: 192px;
+        height: 106px;
+        display: flex;
+        align-content: space-between;
+        flex-wrap: wrap;
+      }
+      .inner
+      {
+        height: 32px;
+        width: 64px;
+        background-image: url(support/aqua-yellow-32x32.png);
+        background-repeat: no-repeat;
+        background-size: 64px 32px;
+      }
+      .inner_gradient
+      {
+        height: 32px;
+        width: 64px;
+        background-image: linear-gradient(to top left, red, green);
+        background-repeat: no-repeat;
+        background-size: 64px 32px;
+      }
+    </style>
+  </head>
+  <body>
+    <div class="outer">
+      <div class="inner"></div>
+      <div class="inner"></div>
+      <div class="inner"></div>
+      <div class="inner"></div>
+      <div class="inner"></div>
+      <div class="inner"></div>
+      <div class="inner"></div>
+      <div class="inner"></div>
+      <div class="inner"></div>
+    </div>
+    <div class="outer">
+      <div class="inner_gradient"></div>
+      <div class="inner_gradient"></div>
+      <div class="inner_gradient"></div>
+      <div class="inner_gradient"></div>
+      <div class="inner_gradient"></div>
+      <div class="inner_gradient"></div>
+      <div class="inner_gradient"></div>
+      <div class="inner_gradient"></div>
+      <div class="inner_gradient"></div>
+    </div>
+  </body>
+</html>
+
diff --git a/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-6.html b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-6.html
new file mode 100644
index 000000000000..ae2c0fa8f633
--- /dev/null
+++ b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-6.html
@@ -0,0 +1,35 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>CSS Background: background-repeat: background image space</title>
+    <link rel="author" title="Ethan Lin" href="mailto:ethlin@mozilla.com">
+    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
+    <link rel="help" href="https://www.w3.org/TR/css3-background/#background-repeat">
+    <link rel="match" href="background-repeat-space-6-ref.html">
+    <meta name="assert" content="Test checks whether background-repeat: 'round space' works correctly or not.">
+    <style type="text/css">
+      .outer {
+        width: 192px;
+        height: 106px;
+        border: 1px solid black;
+        background-size: 60px 32px;
+        background-image: url(support/aqua-yellow-32x32.png);
+        background-repeat: round space;
+      }
+      .outer_gradient {
+        width: 192px;
+        height: 106px;
+        border: 1px solid black;
+        background-size: 60px 32px;
+        background-image: linear-gradient(to top left, red, green);
+        background-repeat: round space;
+      }
+    </style>
+  </head>
+  <body>
+    <div class="outer"></div>
+    <div class="outer_gradient"></div>
+  </body>
+</html>
+
diff --git a/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-7-ref.html b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-7-ref.html
new file mode 100644
index 000000000000..541fbd4ddc2e
--- /dev/null
+++ b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-7-ref.html
@@ -0,0 +1,61 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>CSS Background: background-repeat: position background image</title>
+    <link rel="author" title="Ethan Lin" href="mailto:ethlin@mozilla.com">
+    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
+    <style type="text/css">
+      .outer
+      {
+        border: 1px solid black;
+        width: 106px;
+        height: 192px;
+        display: flex;
+        justify-content: space-between;
+        flex-wrap: wrap;
+      }
+      .inner
+      {
+        height: 64px;
+        width: 32px;
+        background-image: url(support/aqua-yellow-32x32.png);
+        background-repeat: no-repeat;
+        background-size: 32px 64px;
+      }
+      .inner_gradient
+      {
+        height: 64px;
+        width: 32px;
+        background-image: linear-gradient(to top left, red, green);
+        background-repeat: no-repeat;
+        background-size: 32px 64px;
+      }
+    </style>
+  </head>
+  <body>
+    <div class="outer">
+      <div class="inner"></div>
+      <div class="inner"></div>
+      <div class="inner"></div>
+      <div class="inner"></div>
+      <div class="inner"></div>
+      <div class="inner"></div>
+      <div class="inner"></div>
+      <div class="inner"></div>
+      <div class="inner"></div>
+    </div>
+    <div class="outer">
+      <div class="inner_gradient"></div>
+      <div class="inner_gradient"></div>
+      <div class="inner_gradient"></div>
+      <div class="inner_gradient"></div>
+      <div class="inner_gradient"></div>
+      <div class="inner_gradient"></div>
+      <div class="inner_gradient"></div>
+      <div class="inner_gradient"></div>
+      <div class="inner_gradient"></div>
+    </div>
+  </body>
+</html>
+
diff --git a/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-7.html b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-7.html
new file mode 100644
index 000000000000..809875f57be0
--- /dev/null
+++ b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-7.html
@@ -0,0 +1,35 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>CSS Background: background-repeat: background image space</title>
+    <link rel="author" title="Ethan Lin" href="mailto:ethlin@mozilla.com">
+    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
+    <link rel="help" href="https://www.w3.org/TR/css3-background/#background-repeat">
+    <link rel="match" href="background-repeat-space-7-ref.html">
+    <meta name="assert" content="Test checks whether background-repeat: 'space round' works correctly or not.">
+    <style type="text/css">
+      .outer {
+        width: 106px;
+        height: 192px;
+        border: 1px solid black;
+        background-size: 32px 60px;
+        background-image: url(support/aqua-yellow-32x32.png);
+        background-repeat: space round;
+      }
+      .outer_gradient {
+        width: 106px;
+        height: 192px;
+        border: 1px solid black;
+        background-size: 32px 60px;
+        background-image: linear-gradient(to top left, red, green);
+        background-repeat: space round;
+      }
+    </style>
+  </head>
+  <body>
+    <div class="outer"></div>
+    <div class="outer_gradient"></div>
+  </body>
+</html>
+
diff --git a/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-8-ref.html b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-8-ref.html
new file mode 100644
index 000000000000..584640917135
--- /dev/null
+++ b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-8-ref.html
@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>CSS Background: background-repeat: position background image</title>
+    <link rel="author" title="Ethan Lin" href="mailto:ethlin@mozilla.com">
+    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
+    <style type="text/css">
+      .outer
+      {
+        border: 20px solid rgba(0, 0, 0, 0.5);
+        width: 106px;
+        height: 106px;
+        background-image: url(support/aqua-yellow-37x37.png);
+        background-repeat: repeat;
+      }
+      .outer_gradient
+      {
+        border: 20px solid rgba(0, 0, 0, 0.5);
+        width: 32px;
+        height: 32px;
+        background-size: 50px 50px;
+        background-image: linear-gradient(to top left, red, green);
+        background-repeat: no-repeat;
+        background-position: -10px -10px;
+      }
+    </style>
+  </head>
+  <body>
+    <div class="outer"></div>
+    <div class="outer_gradient"></div>
+  </body>
+</html>
+
diff --git a/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-8.html b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-8.html
new file mode 100644
index 000000000000..473d115ba690
--- /dev/null
+++ b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-8.html
@@ -0,0 +1,35 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>CSS Background: background-repeat: background image space</title>
+    <link rel="author" title="Ethan Lin" href="mailto:ethlin@mozilla.com">
+    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
+    <link rel="help" href="https://www.w3.org/TR/css3-background/#background-repeat">
+    <link rel="match" href="background-repeat-space-8-ref.html">
+    <meta name="assert" content="Test checks whether background-repeat: 'space' works correctly or not.">
+    <style type="text/css">
+      .outer {
+        width: 106px;
+        height: 106px;
+        border: 20px solid rgba(0, 0, 0, .5);
+        background-image: url(support/aqua-yellow-32x32.png);
+        background-repeat: space;
+      }
+      .outer_gradient {
+        width: 32px;
+        height: 32px;
+        border: 20px solid rgba(0, 0, 0, .5);
+        background-size: 50px 50px;
+        background-image: linear-gradient(to top left, red, green);
+        background-repeat: space;
+        background-position: -10px -10px;
+      }
+    </style>
+  </head>
+  <body>
+    <div class="outer"></div>
+    <div class="outer_gradient"></div>
+  </body>
+</html>
+
diff --git a/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-9-ref.html b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-9-ref.html
new file mode 100644
index 000000000000..6aa9c7321551
--- /dev/null
+++ b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-9-ref.html
@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>CSS Background: background-repeat: position background image</title>
+    <link rel="author" title="Ethan Lin" href="mailto:ethlin@mozilla.com">
+    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
+    <style type="text/css">
+      .outer
+      {
+        border: 1px solid black;
+        width: 106px;
+        height: 96px;
+        display: flex;
+        justify-content: space-between;
+        align-content: space-between;
+        flex-wrap: wrap;
+      }
+      .inner
+      {
+        height: 32px;
+        width: 32px;
+        background-image: url(support/aqua-yellow-32x32.png);
+      }
+    </style>
+  </head>
+  <body>
+    <div class="outer">
+      <div class="inner"></div>
+      <div class="inner"></div>
+      <div class="inner"></div>
+      <div class="inner"></div>
+      <div class="inner"></div>
+      <div class="inner"></div>
+      <div class="inner"></div>
+      <div class="inner"></div>
+      <div class="inner"></div>
+    </div>
+  </body>
+</html>
+
diff --git a/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-9.html b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-9.html
new file mode 100644
index 000000000000..28ff46473be4
--- /dev/null
+++ b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/background-repeat-space-9.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>CSS Background: background-repeat: background image space</title>
+    <link rel="author" title="Ethan Lin" href="mailto:ethlin@mozilla.com">
+    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
+    <link rel="help" href="https://www.w3.org/TR/css3-background/#background-repeat">
+    <link rel="match" href="background-repeat-space-9-ref.html">
+    <meta name="assert" content="Test checks whether background-repeat: 'space' works correctly or not.">
+    <style type="text/css">
+      .outer {
+        width: 106px;
+        height: 96px;
+        border: 1px solid black;
+        background-image: url(support/aqua-yellow-32x32.png);
+        background-repeat: space;
+      }
+    </style>
+  </head>
+  <body>
+    <div class="outer"></div>
+  </body>
+</html>
+
diff --git a/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-round-1-ref.html b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-round-1-ref.html
new file mode 100644
index 000000000000..298b46dd1284
--- /dev/null
+++ b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-round-1-ref.html
@@ -0,0 +1,100 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>CSS Border Image: border-image-repeat: round</title>
+    <link rel="author" title="Ethan Lin" href="mailto:ethlin@mozilla.com">
+    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
+    <style type="text/css">
+      .outer {
+        width: 81px;
+        height: 81px;
+      }
+      .inner1 {
+        position: absolute;
+        top: 0px;
+        left: 0px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/border.png");
+      }
+      .inner2 {
+        position: absolute;
+        top: 0px;
+        left: 27px;
+        width: 34px;
+        height: 27px;
+        background-size: 102px 81px;
+        background-image: url("support/border.png");
+        background-position: -34px 0px;
+      }
+      .inner3 {
+        position: absolute;
+        top: 0px;
+        left: 61px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/border.png");
+      }
+      .inner4 {
+        position: absolute;
+        top: 27px;
+        left: 0px;
+        width: 27px;
+        height: 34px;
+        background-size: 81px 102px;
+        background-image: url("support/border.png");
+        background-position: 0px -34px;
+      }
+      .inner5 {
+        position: absolute;
+        top: 27px;
+        left: 61px;
+        width: 27px;
+        height: 34px;
+        background-size: 81px 102px;
+        background-image: url("support/border.png");
+        background-position: -54px -34px;
+      }
+      .inner6 {
+        position: absolute;
+        top: 61px;
+        left: 0px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/border.png");
+      }
+      .inner7 {
+        position: absolute;
+        top: 61px;
+        left: 27px;
+        width: 34px;
+        height: 27px;
+        background-size: 102px 81px;
+        background-image: url("support/border.png");
+        background-position: -34px -54px;
+      }
+      .inner8 {
+        position: absolute;
+        top: 61px;
+        left: 61px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/border.png");
+      }
+    </style>
+    </head>
+    <body>
+      <div class="outer">
+        <div class="inner1"></div>
+        <div class="inner2"></div>
+        <div class="inner3"></div>
+        <div class="inner4"></div>
+        <div class="inner5"></div>
+        <div class="inner6"></div>
+        <div class="inner7"></div>
+        <div class="inner8"></div>
+      </div>
+    </body>
+</html>
+
diff --git a/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-round-1.html b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-round-1.html
new file mode 100644
index 000000000000..832126ef3dff
--- /dev/null
+++ b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-round-1.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>CSS Border Image: border-image-repeat: round</title>
+    <link rel="author" title="Ethan Lin" href="mailto:ethlin@mozilla.com">
+    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
+    <link rel="help" href="https://www.w3.org/TR/css3-background/#background-repeat">
+    <link rel="match" href="border-image-repeat-round-1-ref.html">
+    <meta name="assert" content="The test checks whether border-image-repeat: 'round' uses the correct rounding formula.">
+    <style type="text/css">
+      .outer {
+        position: absolute;
+        left: 0px;
+        top: 0px;
+        border: 27px solid transparent;
+        border-image: url("support/border.png") 27;
+        border-image-repeat: round round;
+        width: 34px;
+        height: 34px;
+      }
+    </style>
+  </head>
+  <body>
+    <div class="outer"></div>
+  </body>
+</html>
diff --git a/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-round-2-ref.html b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-round-2-ref.html
new file mode 100644
index 000000000000..e76f7cee8321
--- /dev/null
+++ b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-round-2-ref.html
@@ -0,0 +1,100 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>CSS Border Image: border-image-repeat: round</title>
+    <link rel="author" title="Ethan Lin" href="mailto:ethlin@mozilla.com">
+    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
+    <style type="text/css">
+      .outer {
+        width: 81px;
+        height: 81px;
+      }
+      .inner1 {
+        position: absolute;
+        top: 0px;
+        left: 0px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/border.png");
+      }
+      .inner2 {
+        position: absolute;
+        top: 0px;
+        left: 27px;
+        width: 13px;
+        height: 27px;
+        background-size: 39px 81px;
+        background-image: url("support/border.png");
+        background-position: -13px 0px;
+      }
+      .inner3 {
+        position: absolute;
+        top: 0px;
+        left: 40px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/border.png");
+      }
+      .inner4 {
+        position: absolute;
+        top: 27px;
+        left: 0px;
+        width: 27px;
+        height: 13px;
+        background-size: 81px 39px;
+        background-image: url("support/border.png");
+        background-position: 0px -13px;
+      }
+      .inner5 {
+        position: absolute;
+        top: 27px;
+        left: 40px;
+        width: 27px;
+        height: 13px;
+        background-size: 81px 39px;
+        background-image: url("support/border.png");
+        background-position: -54px -13px;
+      }
+      .inner6 {
+        position: absolute;
+        top: 40px;
+        left: 0px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/border.png");
+      }
+      .inner7 {
+        position: absolute;
+        top: 40px;
+        left: 27px;
+        width: 13px;
+        height: 27px;
+        background-size: 39px 81px;
+        background-image: url("support/border.png");
+        background-position: -13px -54px;
+      }
+      .inner8 {
+        position: absolute;
+        top: 40px;
+        left: 40px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/border.png");
+      }
+    </style>
+    </head>
+    <body>
+      <div class="outer">
+        <div class="inner1"></div>
+        <div class="inner2"></div>
+        <div class="inner3"></div>
+        <div class="inner4"></div>
+        <div class="inner5"></div>
+        <div class="inner6"></div>
+        <div class="inner7"></div>
+        <div class="inner8"></div>
+      </div>
+    </body>
+</html>
+
diff --git a/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-round-2.html b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-round-2.html
new file mode 100644
index 000000000000..4e08ae036650
--- /dev/null
+++ b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-round-2.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>CSS Border Image: border-image-repeat: round</title>
+    <link rel="author" title="Ethan Lin" href="mailto:ethlin@mozilla.com">
+    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
+    <link rel="help" href="https://www.w3.org/TR/css3-background/#background-repeat">
+    <link rel="match" href="border-image-repeat-round-2-ref.html">
+    <meta name="assert" content="The test checks whether border-image-repeat: 'round' uses the correct rounding formula.">
+    <style type="text/css">
+      .outer {
+        position: absolute;
+        left: 0px;
+        top: 0px;
+        border: 27px solid transparent;
+        border-image: url("support/border.png") 27;
+        border-image-repeat: round round;
+        width: 13px;
+        height: 13px;
+      }
+    </style>
+  </head>
+  <body>
+    <div class="outer"></div>
+  </body>
+</html>
diff --git a/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-space-1-ref.html b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-space-1-ref.html
new file mode 100644
index 000000000000..7c6555a0ae49
--- /dev/null
+++ b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-space-1-ref.html
@@ -0,0 +1,96 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>CSS Border Image: border-image-repeat: space</title>
+    <link rel="author" title="Ethan Lin" href="mailto:ethlin@mozilla.com">
+    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
+    <style type="text/css">
+      .outer {
+        width: 81px;
+        height: 81px;
+      }
+      .inner1 {
+        position: absolute;
+        top: 0px;
+        left: 0px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/border.png");
+      }
+      .inner2 {
+        position: absolute;
+        top: 0px;
+        left: 31px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/border.png");
+        background-position: -27px 0px;
+      }
+      .inner3 {
+        position: absolute;
+        top: 0px;
+        left: 62px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/border.png");
+      }
+      .inner4 {
+        position: absolute;
+        top: 31px;
+        left: 0px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/border.png");
+        background-position: 0px -27px;
+      }
+      .inner5 {
+        position: absolute;
+        top: 31px;
+        left: 62px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/border.png");
+        background-position: -54px -27px;
+      }
+      .inner6 {
+        position: absolute;
+        top: 62px;
+        left: 0px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/border.png");
+      }
+      .inner7 {
+        position: absolute;
+        top: 62px;
+        left: 31px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/border.png");
+        background-position: -27px -54px;
+      }
+      .inner8 {
+        position: absolute;
+        top: 62px;
+        left: 62px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/border.png");
+      }
+    </style>
+    </head>
+    <body>
+      <div class="outer">
+        <div class="inner1"></div>
+        <div class="inner2"></div>
+        <div class="inner3"></div>
+        <div class="inner4"></div>
+        <div class="inner5"></div>
+        <div class="inner6"></div>
+        <div class="inner7"></div>
+        <div class="inner8"></div>
+      </div>
+    </body>
+</html>
+
diff --git a/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-space-1.html b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-space-1.html
new file mode 100644
index 000000000000..c186a3139fe4
--- /dev/null
+++ b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-space-1.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>CSS Border Image: border-image-repeat: space</title>
+    <link rel="author" title="Ethan Lin" href="mailto:ethlin@mozilla.com">
+    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
+    <link rel="help" href="https://www.w3.org/TR/css3-background/#the-border-image-repeat">
+    <link rel="match" href="border-image-repeat-space-1-ref.html">
+    <meta name="assert" content="The test checks whether border-image-repeat: 'space' uses the correct formula when a single image fits.">
+    <style type="text/css">
+      .outer {
+        position: absolute;
+        left: 0px;
+        top: 0px;
+        border: 27px solid transparent;
+        border-image: url("support/border.png") 27;
+        border-image-repeat: space space;
+        width: 35px;
+        height: 35px;
+      }
+    </style>
+  </head>
+  <body>
+    <div class="outer"></div>
+  </body>
+</html>
diff --git a/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-space-2-ref.html b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-space-2-ref.html
new file mode 100644
index 000000000000..6afc0733880c
--- /dev/null
+++ b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-space-2-ref.html
@@ -0,0 +1,56 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>CSS Border Image: border-image-repeat: round</title>
+    <link rel="author" title="Ethan Lin" href="mailto:ethlin@mozilla.com">
+    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
+    <style type="text/css">
+      .outer {
+        width: 67px;
+        height: 67px;
+      }
+      .inner1 {
+        position: absolute;
+        top: 0px;
+        left: 0px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/border.png");
+      }
+      .inner2 {
+        position: absolute;
+        top: 0px;
+        left: 40px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/border.png");
+      }
+      .inner3 {
+        position: absolute;
+        top: 40px;
+        left: 0px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/border.png");
+      }
+      .inner4 {
+        position: absolute;
+        top: 40px;
+        left: 40px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/border.png");
+      }
+    </style>
+    </head>
+    <body>
+      <div class="outer">
+        <div class="inner1"></div>
+        <div class="inner2"></div>
+        <div class="inner3"></div>
+        <div class="inner4"></div>
+      </div>
+    </body>
+</html>
+
diff --git a/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-space-2.html b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-space-2.html
new file mode 100644
index 000000000000..b38bc8473428
--- /dev/null
+++ b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-space-2.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>CSS Border Image: border-image-repeat: space</title>
+    <link rel="author" title="Ethan Lin" href="mailto:ethlin@mozilla.com">
+    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
+    <link rel="help" href="https://www.w3.org/TR/css3-background/#the-border-image-repeat">
+    <link rel="match" href="border-image-repeat-space-2-ref.html">
+    <meta name="assert" content="The test checks whether border-image-repeat: 'space' uses the correct formula when no images fit.">
+    <style type="text/css">
+      .outer {
+        position: absolute;
+        left: 0px;
+        top: 0px;
+        border: 27px solid transparent;
+        border-image: url("support/border.png") 27;
+        border-image-repeat: space space;
+        width: 13px;
+        height: 13px;
+      }
+    </style>
+  </head>
+  <body>
+    <div class="outer"></div>
+  </body>
+</html>
diff --git a/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-space-3-ref.html b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-space-3-ref.html
new file mode 100644
index 000000000000..904b325ccdcd
--- /dev/null
+++ b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-space-3-ref.html
@@ -0,0 +1,136 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>CSS Border Image: border-image-repeat: space</title>
+    <link rel="author" title="Ethan Lin" href="mailto:ethlin@mozilla.com">
+    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
+    <style type="text/css">
+      .outer {
+        width: 114px;
+        height: 114px;
+      }
+      .inner1 {
+        position: absolute;
+        top: 0px;
+        left: 0px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/border.png");
+      }
+      .inner2_1 {
+        position: absolute;
+        top: 0px;
+        left: 29px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/border.png");
+        background-position: -27px 0px;
+      }
+      .inner2_2 {
+        position: absolute;
+        top: 0px;
+        left: 58px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/border.png");
+        background-position: -27px 0px;
+      }
+      .inner3 {
+        position: absolute;
+        top: 0px;
+        left: 87px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/border.png");
+      }
+      .inner4_1 {
+        position: absolute;
+        top: 29px;
+        left: 0px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/border.png");
+        background-position: 0px -27px;
+      }
+      .inner4_2 {
+        position: absolute;
+        top: 58px;
+        left: 0px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/border.png");
+        background-position: 0px -27px;
+      }
+      .inner5_1 {
+        position: absolute;
+        top: 29px;
+        left: 87px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/border.png");
+        background-position: -54px -27px;
+      }
+      .inner5_2 {
+        position: absolute;
+        top: 58px;
+        left: 87px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/border.png");
+        background-position: -54px -27px;
+      }
+      .inner6 {
+        position: absolute;
+        top: 87px;
+        left: 0px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/border.png");
+      }
+      .inner7_1 {
+        position: absolute;
+        top: 87px;
+        left: 29px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/border.png");
+        background-position: -27px -54px;
+      }
+      .inner7_2 {
+        position: absolute;
+        top: 87px;
+        left: 58px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/border.png");
+        background-position: -27px -54px;
+      }
+      .inner8 {
+        position: absolute;
+        top: 87px;
+        left: 87px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/border.png");
+      }
+    </style>
+    </head>
+    <body>
+      <div class="outer">
+        <div class="inner1"></div>
+        <div class="inner2_1"></div>
+        <div class="inner2_2"></div>
+        <div class="inner3"></div>
+        <div class="inner4_1"></div>
+        <div class="inner4_2"></div>
+        <div class="inner5_1"></div>
+        <div class="inner5_2"></div>
+        <div class="inner6"></div>
+        <div class="inner7_1"></div>
+        <div class="inner7_2"></div>
+        <div class="inner8"></div>
+      </div>
+    </body>
+</html>
+
diff --git a/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-space-3.html b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-space-3.html
new file mode 100644
index 000000000000..085498f76a94
--- /dev/null
+++ b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-space-3.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>CSS Border Image: border-image-repeat: space</title>
+    <link rel="author" title="Ethan Lin" href="mailto:ethlin@mozilla.com">
+    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
+    <link rel="help" href="https://www.w3.org/TR/css3-background/#the-border-image-repeat">
+    <link rel="match" href="border-image-repeat-space-3-ref.html">
+    <meta name="assert" content="The test checks whether border-image-repeat: 'space' uses the correct formula when multiple images fit.">
+    <style type="text/css">
+      .outer {
+        position: absolute;
+        left: 0px;
+        top: 0px;
+        border: 27px solid transparent;
+        border-image: url("support/border.png") 27;
+        border-image-repeat: space space;
+        width: 60px;
+        height: 60px;
+      }
+    </style>
+  </head>
+  <body>
+    <div class="outer"></div>
+  </body>
+</html>
diff --git a/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-space-4-ref-1.html b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-space-4-ref-1.html
new file mode 100644
index 000000000000..ff7700e9af15
--- /dev/null
+++ b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-space-4-ref-1.html
@@ -0,0 +1,97 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>CSS Border Image: border-image-repeat: space</title>
+    <link rel="author" title="Ethan Lin" href="mailto:ethlin@mozilla.com">
+    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
+    <link rel="match" href="border-image-repeat-space-4-ref-2.html">
+    <style type="text/css">
+      .outer {
+        width: 81px;
+        height: 81px;
+      }
+      .inner1 {
+        position: absolute;
+        top: 0px;
+        left: 0px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/border.png");
+      }
+      .inner2 {
+        position: absolute;
+        top: 0px;
+        left: 27px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/border.png");
+        background-position: -27px 0px;
+      }
+      .inner3 {
+        position: absolute;
+        top: 0px;
+        left: 54px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/border.png");
+      }
+      .inner4 {
+        position: absolute;
+        top: 27px;
+        left: 0px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/border.png");
+        background-position: 0px -27px;
+      }
+      .inner5 {
+        position: absolute;
+        top: 27px;
+        left: 54px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/border.png");
+        background-position: -54px -27px;
+      }
+      .inner6 {
+        position: absolute;
+        top: 54px;
+        left: 0px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/border.png");
+      }
+      .inner7 {
+        position: absolute;
+        top: 54px;
+        left: 27px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/border.png");
+        background-position: -27px -54px;
+      }
+      .inner8 {
+        position: absolute;
+        top: 54px;
+        left: 54px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/border.png");
+      }
+    </style>
+    </head>
+    <body>
+      <div class="outer">
+        <div class="inner1"></div>
+        <div class="inner2"></div>
+        <div class="inner3"></div>
+        <div class="inner4"></div>
+        <div class="inner5"></div>
+        <div class="inner6"></div>
+        <div class="inner7"></div>
+        <div class="inner8"></div>
+      </div>
+    </body>
+</html>
+
diff --git a/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-space-4-ref-2.html b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-space-4-ref-2.html
new file mode 100644
index 000000000000..dda3de638a2d
--- /dev/null
+++ b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-space-4-ref-2.html
@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>CSS Border Image: border-image-repeat: space</title>
+    <link rel="author" title="Ethan Lin" href="mailto:ethlin@mozilla.com">
+    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
+    <style type="text/css">
+      .outer {
+        position: absolute;
+        left: 0px;
+        top: 0px;
+        border: 27px solid transparent;
+        border-image: url("support/border.png") 27;
+        border-image-repeat: stretch stretch;
+        width: 27px;
+        height: 27px;
+      }
+    </style>
+  </head>
+  <body>
+    <div class="outer"></div>
+  </body>
+</html>
diff --git a/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-space-4.html b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-space-4.html
new file mode 100644
index 000000000000..d82969d71c40
--- /dev/null
+++ b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-space-4.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>CSS Border Image: border-image-repeat: space</title>
+    <link rel="author" title="Ethan Lin" href="mailto:ethlin@mozilla.com">
+    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
+    <link rel="help" href="https://www.w3.org/TR/css3-background/#the-border-image-repeat">
+    <link rel="match" href="border-image-repeat-space-4-ref-1.html">
+    <meta name="assert" content="The test checks whether border-image-repeat: 'space' uses the correct formula when a single image fits exactly.">
+    <style type="text/css">
+      .outer {
+        position: absolute;
+        left: 0px;
+        top: 0px;
+        border: 27px solid transparent;
+        border-image: url("support/border.png") 27;
+        border-image-repeat: space space;
+        width: 27px;
+        height: 27px;
+      }
+    </style>
+  </head>
+  <body>
+    <div class="outer"></div>
+  </body>
+</html>
diff --git a/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-space-5-ref-1.html b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-space-5-ref-1.html
new file mode 100644
index 000000000000..d52cab5bbe96
--- /dev/null
+++ b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-space-5-ref-1.html
@@ -0,0 +1,177 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>CSS Border Image: border-image-repeat: space</title>
+    <link rel="author" title="Ethan Lin" href="mailto:ethlin@mozilla.com">
+    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
+    <link rel="match" href="border-image-repeat-space-5-ref-2.html">
+    <style type="text/css">
+      .outer {
+        width: 135px;
+        height: 135px;
+      }
+      .inner1 {
+        position: absolute;
+        top: 0px;
+        left: 0px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/border.png");
+      }
+      .inner2_1 {
+        position: absolute;
+        top: 0px;
+        left: 27px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/border.png");
+        background-position: -27px 0px;
+      }
+      .inner2_2 {
+        position: absolute;
+        top: 0px;
+        left: 54px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/border.png");
+        background-position: -27px 0px;
+      }
+      .inner2_3 {
+        position: absolute;
+        top: 0px;
+        left: 81px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/border.png");
+        background-position: -27px 0px;
+      }
+      .inner3 {
+        position: absolute;
+        top: 0px;
+        left: 108px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/border.png");
+      }
+      .inner4_1 {
+        position: absolute;
+        top: 27px;
+        left: 0px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/border.png");
+        background-position: 0px -27px;
+      }
+      .inner4_2 {
+        position: absolute;
+        top: 54px;
+        left: 0px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/border.png");
+        background-position: 0px -27px;
+      }
+      .inner4_3 {
+        position: absolute;
+        top: 81px;
+        left: 0px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/border.png");
+        background-position: 0px -27px;
+      }
+      .inner5_1 {
+        position: absolute;
+        top: 27px;
+        left: 108px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/border.png");
+        background-position: -54px -27px;
+      }
+      .inner5_2 {
+        position: absolute;
+        top: 54px;
+        left: 108px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/border.png");
+        background-position: -54px -27px;
+      }
+      .inner5_3 {
+        position: absolute;
+        top: 81px;
+        left: 108px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/border.png");
+        background-position: -54px -27px;
+      }
+      .inner6 {
+        position: absolute;
+        top: 108px;
+        left: 0px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/border.png");
+      }
+      .inner7_1 {
+        position: absolute;
+        top: 108px;
+        left: 27px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/border.png");
+        background-position: -27px -54px;
+      }
+      .inner7_2 {
+        position: absolute;
+        top: 108px;
+        left: 54px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/border.png");
+        background-position: -27px -54px;
+      }
+      .inner7_3 {
+        position: absolute;
+        top: 108px;
+        left: 81px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/border.png");
+        background-position: -27px -54px;
+      }
+      .inner8 {
+        position: absolute;
+        top: 108px;
+        left: 108px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/border.png");
+      }
+    </style>
+    </head>
+    <body>
+      <div class="outer">
+        <div class="inner1"></div>
+        <div class="inner2_1"></div>
+        <div class="inner2_2"></div>
+        <div class="inner2_3"></div>
+        <div class="inner3"></div>
+        <div class="inner4_1"></div>
+        <div class="inner4_2"></div>
+        <div class="inner4_3"></div>
+        <div class="inner5_1"></div>
+        <div class="inner5_2"></div>
+        <div class="inner5_3"></div>
+        <div class="inner6"></div>
+        <div class="inner7_1"></div>
+        <div class="inner7_2"></div>
+        <div class="inner7_3"></div>
+        <div class="inner8"></div>
+      </div>
+    </body>
+</html>
+
diff --git a/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-space-5-ref-2.html b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-space-5-ref-2.html
new file mode 100644
index 000000000000..bda8d7237f35
--- /dev/null
+++ b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-space-5-ref-2.html
@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>CSS Border Image: border-image-repeat: space</title>
+    <link rel="author" title="Ethan Lin" href="mailto:ethlin@mozilla.com">
+    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
+    <style type="text/css">
+      .outer {
+        position: absolute;
+        left: 0px;
+        top: 0px;
+        border: 27px solid transparent;
+        border-image: url("support/border.png") 27;
+        border-image-repeat: repeat repeat;
+        width: 81px;
+        height: 81px;
+      }
+    </style>
+  </head>
+  <body>
+    <div class="outer"></div>
+  </body>
+</html>
diff --git a/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-space-5.html b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-space-5.html
new file mode 100644
index 000000000000..db21548af867
--- /dev/null
+++ b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-space-5.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>CSS Border Image: border-image-repeat: space</title>
+    <link rel="author" title="Ethan Lin" href="mailto:ethlin@mozilla.com">
+    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
+    <link rel="help" href="https://www.w3.org/TR/css3-background/#the-border-image-repeat">
+    <link rel="match" href="border-image-repeat-space-5-ref-1.html">
+    <meta name="assert" content="The test checks whether border-image-repeat: 'space' uses the correct formula when multiple images fit exactly.">
+    <style type="text/css">
+      .outer {
+        position: absolute;
+        left: 0px;
+        top: 0px;
+        border: 27px solid transparent;
+        border-image: url("support/border.png") 27;
+        border-image-repeat: space space;
+        width: 81px;
+        height: 81px;
+      }
+    </style>
+  </head>
+  <body>
+    <div class="outer"></div>
+  </body>
+</html>
diff --git a/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-space-6-ref.html b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-space-6-ref.html
new file mode 100644
index 000000000000..307eda0ea524
--- /dev/null
+++ b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-space-6-ref.html
@@ -0,0 +1,101 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>CSS Border Image: border-image-repeat: space</title>
+    <link rel="author" title="Ethan Lin" href="mailto:ethlin@mozilla.com">
+    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
+    <style type="text/css">
+      .outer {
+        width: 81px;
+        height: 81px;
+      }
+      .inner1 {
+        position: absolute;
+        top: 0px;
+        left: 0px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/reticule-tl.png");
+      }
+      .inner2 {
+        position: absolute;
+        top: 0px;
+        left: 27px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/reticule-to.png");
+      }
+      .inner3 {
+        position: absolute;
+        top: 0px;
+        left: 54px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/reticule-tr.png");
+      }
+      .inner4 {
+        position: absolute;
+        top: 27px;
+        left: 0px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/reticule-le.png");
+      }
+      .inner5 {
+        position: absolute;
+        top: 27px;
+        left: 27px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/reticule-ct.png");
+      }
+      .inner6 {
+        position: absolute;
+        top: 27px;
+        left: 54px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/reticule-ri.png");
+      }
+      .inner7 {
+        position: absolute;
+        top: 54px;
+        left: 0px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/reticule-bl.png");
+      }
+      .inner8 {
+        position: absolute;
+        top: 54px;
+        left: 27px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/reticule-bo.png");
+      }
+      .inner9 {
+        position: absolute;
+        top: 54px;
+        left: 54px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/reticule-br.png");
+      }
+    </style>
+    </head>
+    <body>
+      <div class="outer">
+        <div class="inner1"></div>
+        <div class="inner2"></div>
+        <div class="inner3"></div>
+        <div class="inner4"></div>
+        <div class="inner5"></div>
+        <div class="inner6"></div>
+        <div class="inner7"></div>
+        <div class="inner8"></div>
+        <div class="inner9"></div>
+      </div>
+    </body>
+</html>
+
diff --git a/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-space-6.html b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-space-6.html
new file mode 100644
index 000000000000..045cde139d7c
--- /dev/null
+++ b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-space-6.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>CSS Border Image: border-image-repeat: space</title>
+    <link rel="author" title="Ethan Lin" href="mailto:ethlin@mozilla.com">
+    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
+    <link rel="help" href="https://www.w3.org/TR/css3-background/#the-border-image-repeat">
+    <link rel="match" href="border-image-repeat-space-6-ref.html">
+    <meta name="assert" content="The test checks whether border-image-repeat: 'space' with 'fill' uses the correct formula when a single image fits exactly.">
+    <style type="text/css">
+      .outer {
+        position: absolute;
+        left: 0px;
+        top: 0px;
+        border-width: 27px;
+        border-style: solid;
+        border-image: url("support/reticule.png") 27 fill space;
+        width: 27px;
+        height: 27px;
+      }
+    </style>
+  </head>
+  <body>
+    <div class="outer"></div>
+  </body>
+</html>
diff --git a/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-space-7-ref.html b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-space-7-ref.html
new file mode 100644
index 000000000000..44b07f7696a7
--- /dev/null
+++ b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-space-7-ref.html
@@ -0,0 +1,164 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>CSS Border Image: border-image-repeat: space</title>
+    <link rel="author" title="Ethan Lin" href="mailto:ethlin@mozilla.com">
+    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
+    <style type="text/css">
+      .outer {
+        width: 132px;
+        height: 132px;
+      }
+      .inner1 {
+        position: absolute;
+        top: 0px;
+        left: 0px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/reticule-tl.png");
+      }
+      .inner2_1 {
+        position: absolute;
+        top: 0px;
+        left: 35px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/reticule-to.png");
+      }
+      .inner2_2 {
+        position: absolute;
+        top: 0px;
+        left: 70px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/reticule-to.png");
+      }
+      .inner3 {
+        position: absolute;
+        top: 0px;
+        left: 105px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/reticule-tr.png");
+      }
+      .inner4_1 {
+        position: absolute;
+        top: 35px;
+        left: 0px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/reticule-le.png");
+      }
+      .inner4_2 {
+        position: absolute;
+        top: 70px;
+        left: 0px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/reticule-le.png");
+      }
+      .inner5_1 {
+        position: absolute;
+        top: 35px;
+        left: 35px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/reticule-ct.png");
+      }
+      .inner5_2 {
+        position: absolute;
+        top: 35px;
+        left: 70px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/reticule-ct.png");
+      }
+      .inner5_3 {
+        position: absolute;
+        top: 70px;
+        left: 35px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/reticule-ct.png");
+      }
+      .inner5_4 {
+        position: absolute;
+        top: 70px;
+        left: 70px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/reticule-ct.png");
+      }
+      .inner6_1 {
+        position: absolute;
+        top: 35px;
+        left: 105px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/reticule-ri.png");
+      }
+      .inner6_2 {
+        position: absolute;
+        top: 70px;
+        left: 105px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/reticule-ri.png");
+      }
+      .inner7 {
+        position: absolute;
+        top: 105px;
+        left: 0px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/reticule-bl.png");
+      }
+      .inner8_1 {
+        position: absolute;
+        top: 105px;
+        left: 35px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/reticule-bo.png");
+      }
+      .inner8_2 {
+        position: absolute;
+        top: 105px;
+        left: 70px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/reticule-bo.png");
+      }
+      .inner9 {
+        position: absolute;
+        top: 105px;
+        left: 105px;
+        width: 27px;
+        height: 27px;
+        background-image: url("support/reticule-br.png");
+      }
+    </style>
+    </head>
+    <body>
+      <div class="outer">
+        <div class="inner1"></div>
+        <div class="inner2_1"></div>
+        <div class="inner2_2"></div>
+        <div class="inner3"></div>
+        <div class="inner4_1"></div>
+        <div class="inner4_2"></div>
+        <div class="inner5_1"></div>
+        <div class="inner5_2"></div>
+        <div class="inner5_3"></div>
+        <div class="inner5_4"></div>
+        <div class="inner6_1"></div>
+        <div class="inner6_2"></div>
+        <div class="inner7"></div>
+        <div class="inner8_1"></div>
+        <div class="inner8_2"></div>
+        <div class="inner9"></div>
+      </div>
+    </body>
+</html>
+
diff --git a/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-space-7.html b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-space-7.html
new file mode 100644
index 000000000000..367657858ea2
--- /dev/null
+++ b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/border-image-repeat-space-7.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>CSS Border Image: border-image-repeat: space</title>
+    <link rel="author" title="Ethan Lin" href="mailto:ethlin@mozilla.com">
+    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
+    <link rel="help" href="https://www.w3.org/TR/css3-background/#the-border-image-repeat">
+    <link rel="match" href="border-image-repeat-space-7-ref.html">
+    <meta name="assert" content="The test checks whether border-image-repeat: 'space' with 'fill' uses the correct formula when multiple image fit.">
+    <style type="text/css">
+      .outer {
+        position: absolute;
+        left: 0px;
+        top: 0px;
+        border-width: 27px;
+        border-style: solid;
+        border-image: url("support/reticule.png") 27 fill space;
+        width: 78px;
+        height: 78px;
+      }
+    </style>
+  </head>
+  <body>
+    <div class="outer"></div>
+  </body>
+</html>
diff --git a/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/support/aqua-yellow-32x32.png b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/support/aqua-yellow-32x32.png
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diff --git a/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/support/border.png b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/support/border.png
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diff --git a/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/support/reticule-bl.png b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/support/reticule-bl.png
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diff --git a/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/support/reticule-bo.png b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/support/reticule-bo.png
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diff --git a/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/support/reticule-br.png b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/support/reticule-br.png
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diff --git a/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/support/reticule-ct.png b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/support/reticule-ct.png
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diff --git a/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/support/reticule-ri.png b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/support/reticule-ri.png
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diff --git a/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/support/reticule-tl.png b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/support/reticule-tl.png
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diff --git a/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/support/reticule-to.png b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/support/reticule-to.png
new file mode 100644
index 0000000000000000000000000000000000000000..d1b082c9ba22e903dd5eaa2c7bc49f818e32f574
GIT binary patch
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diff --git a/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/support/reticule-tr.png b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/support/reticule-tr.png
new file mode 100644
index 0000000000000000000000000000000000000000..cd9bb5a5a40baea3d82e2e70de34fce8fb67435b
GIT binary patch
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diff --git a/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/support/reticule.png b/testing/web-platform/tests/css/vendor-imports/mozilla/mozilla-central-reftests/background/support/reticule.png
new file mode 100644
index 0000000000000000000000000000000000000000..02c7d10e76b372e6ff8f4f8ecc58d2756c803a2c
GIT binary patch
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diff --git a/testing/web-platform/tests/lint.whitelist b/testing/web-platform/tests/lint.whitelist
index 032303aeca18..74ecc09bf41d 100644
--- a/testing/web-platform/tests/lint.whitelist
+++ b/testing/web-platform/tests/lint.whitelist
@@ -403,19 +403,6 @@ SUPPORT-WRONG-DIR: css/filter-effects/filter-external-002-filter.svg
 SUPPORT-WRONG-DIR: css/vendor-imports/mozilla/mozilla-central-reftests/check-for-references.sh
 SUPPORT-WRONG-DIR: css/vendor-imports/mozilla/mozilla-central-reftests/sync-tests-filter
 SUPPORT-WRONG-DIR: css/vendor-imports/mozilla/mozilla-central-reftests/sync-tests.sh
-SUPPORT-WRONG-DIR: css/vendor-imports/mozilla/mozilla-central-reftests/background/aqua-yellow-32x32.png
-SUPPORT-WRONG-DIR: css/vendor-imports/mozilla/mozilla-central-reftests/background/aqua-yellow-37x37.png
-SUPPORT-WRONG-DIR: css/vendor-imports/mozilla/mozilla-central-reftests/background/border.png
-SUPPORT-WRONG-DIR: css/vendor-imports/mozilla/mozilla-central-reftests/background/reticule-bl.png
-SUPPORT-WRONG-DIR: css/vendor-imports/mozilla/mozilla-central-reftests/background/reticule-bo.png
-SUPPORT-WRONG-DIR: css/vendor-imports/mozilla/mozilla-central-reftests/background/reticule-br.png
-SUPPORT-WRONG-DIR: css/vendor-imports/mozilla/mozilla-central-reftests/background/reticule-ct.png
-SUPPORT-WRONG-DIR: css/vendor-imports/mozilla/mozilla-central-reftests/background/reticule-le.png
-SUPPORT-WRONG-DIR: css/vendor-imports/mozilla/mozilla-central-reftests/background/reticule-ri.png
-SUPPORT-WRONG-DIR: css/vendor-imports/mozilla/mozilla-central-reftests/background/reticule-tl.png
-SUPPORT-WRONG-DIR: css/vendor-imports/mozilla/mozilla-central-reftests/background/reticule-to.png
-SUPPORT-WRONG-DIR: css/vendor-imports/mozilla/mozilla-central-reftests/background/reticule-tr.png
-SUPPORT-WRONG-DIR: css/vendor-imports/mozilla/mozilla-central-reftests/background/reticule.png
 SUPPORT-WRONG-DIR: css/vendor-imports/mozilla/mozilla-central-reftests/masking/blank.html
 SUPPORT-WRONG-DIR: css/WOFF2/testcaseindex.xht
 NON-EXISTENT-REF: css/css-masking/clip-path-svg-content/clip-path-clip-rule-008.svg