diff --git a/tools/manifest/item.py b/tools/manifest/item.py
index ea0c9b1742c63a..9619813fc9bead 100644
--- a/tools/manifest/item.py
+++ b/tools/manifest/item.py
@@ -329,12 +329,6 @@ class VisualTest(URLManifestItem):
     item_type = "visual"
 
 
-class Stub(URLManifestItem):
-    __slots__ = ()
-
-    item_type = "stub"
-
-
 class WebDriverSpecTest(URLManifestItem):
     __slots__ = ()
 
diff --git a/tools/manifest/manifest.py b/tools/manifest/manifest.py
index 616f95eb2c692d..8aace771cba32a 100644
--- a/tools/manifest/manifest.py
+++ b/tools/manifest/manifest.py
@@ -5,7 +5,7 @@
 from six import iteritems, iterkeys, itervalues, string_types, binary_type, text_type
 
 from . import vcs
-from .item import (ConformanceCheckerTest, ManifestItem, ManualTest, RefTest, RefTestNode, Stub,
+from .item import (ConformanceCheckerTest, ManifestItem, ManualTest, RefTest, RefTestNode,
                    SupportFile, TestharnessTest, VisualTest, WebDriverSpecTest)
 from .log import get_logger
 from .sourcefile import SourceFile
@@ -51,7 +51,6 @@ class ManifestVersionMismatch(ManifestError):
                 "reftest": RefTest,
                 "reftest_node": RefTestNode,
                 "manual": ManualTest,
-                "stub": Stub,
                 "wdspec": WebDriverSpecTest,
                 "conformancechecker": ConformanceCheckerTest,
                 "visual": VisualTest,
@@ -471,6 +470,14 @@ def from_json(cls, tests_root, obj, types=None):
         self._path_hash = {to_os_path(k): v for k, v in iteritems(obj["paths"])}
 
         for test_type, type_paths in iteritems(obj["items"]):
+            # Drop "stub" items, which are no longer supported but may be
+            # present when doing an incremental manifest update.
+            # See https://github.com/web-platform-tests/rfcs/pull/27 for background.
+            #
+            # TODO(MANIFESTv7): remove this condition
+            if test_type == "stub":
+                continue
+
             if test_type not in item_classes:
                 raise ManifestError
 
diff --git a/tools/manifest/sourcefile.py b/tools/manifest/sourcefile.py
index 54cd3b744886f7..4788fc9bdb6404 100644
--- a/tools/manifest/sourcefile.py
+++ b/tools/manifest/sourcefile.py
@@ -33,7 +33,7 @@
 import html5lib
 
 from . import XMLParser
-from .item import (ManifestItem, Stub, ManualTest, WebDriverSpecTest, RefTestNode, TestharnessTest,
+from .item import (ManifestItem, ManualTest, WebDriverSpecTest, RefTestNode, TestharnessTest,
                    SupportFile, ConformanceCheckerTest, VisualTest)
 from .utils import ContextManagerBytesIO, cached_property
 
@@ -352,13 +352,6 @@ def name_is_conformance_support(self):
         # type: () -> bool
         return self.in_conformance_checker_dir()
 
-    @property
-    def name_is_stub(self):
-        # type: () -> bool
-        """Check if the file name matches the conditions for the file to
-        be a stub file"""
-        return self.name_prefix("stub-")
-
     @property
     def name_is_manual(self):
         # type: () -> bool
@@ -793,15 +786,6 @@ def manifest_items(self):
                     self.rel_path
                 )]  # type: Tuple[Text, List[ManifestItem]]
 
-        elif self.name_is_stub:
-            rv = Stub.item_type, [
-                Stub(
-                    self.tests_root,
-                    self.rel_path,
-                    self.url_base,
-                    self.rel_url
-                )]
-
         elif self.name_is_manual:
             rv = ManualTest.item_type, [
                 ManualTest(
diff --git a/tools/manifest/tests/test_manifest.py b/tools/manifest/tests/test_manifest.py
index 5717173b3f268b..8e008be091181d 100644
--- a/tools/manifest/tests/test_manifest.py
+++ b/tools/manifest/tests/test_manifest.py
@@ -50,7 +50,7 @@ def rel_dir_file_path(draw):
 @hs.composite
 def sourcefile_strategy(draw):
     item_classes = [item.TestharnessTest, item.RefTestNode,
-                    item.ManualTest, item.Stub, item.WebDriverSpecTest,
+                    item.ManualTest, item.WebDriverSpecTest,
                     item.ConformanceCheckerTest, item.SupportFile]
     cls = draw(hs.sampled_from(item_classes))
 
diff --git a/tools/wptrunner/wptrunner/metadata.py b/tools/wptrunner/wptrunner/metadata.py
index ca6165f7ad09bb..c614cbaa888720 100644
--- a/tools/wptrunner/wptrunner/metadata.py
+++ b/tools/wptrunner/wptrunner/metadata.py
@@ -454,7 +454,7 @@ def create_test_tree(metadata_path, test_manifest):
     """
     do_delayed_imports()
     id_test_map = {}
-    exclude_types = frozenset(["stub", "manual", "support", "conformancechecker"])
+    exclude_types = frozenset(["manual", "support", "conformancechecker"])
     all_types = set(manifestitem.item_types.keys())
     assert all_types > exclude_types
     include_types = all_types - exclude_types
diff --git a/tools/wptrunner/wptrunner/tests/test_update.py b/tools/wptrunner/wptrunner/tests/test_update.py
index 3860ba6f36d1f6..b6a564216cc212 100644
--- a/tools/wptrunner/wptrunner/tests/test_update.py
+++ b/tools/wptrunner/wptrunner/tests/test_update.py
@@ -31,7 +31,6 @@ def SourceFileWithTest(path, hash, cls, *args):
                 "reftest": manifest_item.RefTest,
                 "reftest_node": manifest_item.RefTestNode,
                 "manual": manifest_item.ManualTest,
-                "stub": manifest_item.Stub,
                 "wdspec": manifest_item.WebDriverSpecTest,
                 "conformancechecker": manifest_item.ConformanceCheckerTest,
                 "visual": manifest_item.VisualTest,