Meta: enable PR preview and link web-platform-tests

See whatwg/meta#16.

.pr-preview.json

@@ -0,0 +1,15 @@
+{
+    "src_file": "notifications.bs",
+    "type": "bikeshed",
+    "params": {
+        "force": 1,
+        "md-status": "LS-COMMIT",
+        "md-h1": "URL <small>(<a href=\"{{ pull_request.html_url }}\">PR #{{ pull_request.number }}</a>)</small>",
+        "md-warning": "Commit {{ short_sha }} {{ pull_request.head.repo.html_url }}/commit/{{ sha }} replaced by {{ config.ls_url }}",
+        "md-title": "{{ config.title }} (Pull Request Snapshot #{{ pull_request.number }})",
+        "md-Text-Macro": "SNAPSHOT-LINK {{ config.back_to_ls_link }}"
+    },
+    "ls_url": "https://notifications.spec.whatwg.org/",
+    "title": "Notifications API Standard",
+    "back_to_ls_link": "<a href=\"https://notifications.spec.whatwg.org/\" id=\"commit-snapshot-link\">Go to the living standard</a>"
+}

Makefile

@@ -1,5 +1,5 @@
 local: notifications.bs
-	bikeshed notifications.bs notifications.html --md-Text-Macro="SNAPSHOT-LINK LOCAL COPY"
+	bikeshed spec notifications.bs notifications.html --md-Text-Macro="SNAPSHOT-LINK LOCAL COPY"
 
 remote: notifications.bs
 	curl https://api.csswg.org/bikeshed/ -f -F [email protected] > notifications.html -F md-Text-Macro="SNAPSHOT-LINK LOCAL COPY"

notifications.bs

@@ -13,6 +13,7 @@ Boilerplate: omit feedback-header, omit conformance
 !Commits: <a href="https://github.com/whatwg/notifications/commits">GitHub whatwg/notifications/commits</a>
 !Commits: [SNAPSHOT-LINK]
 !Commits: <a href="https://twitter.com/notifyapi">@notifyapi</a>
+!Tests: <a href=https://github.com/w3c/web-platform-tests/tree/master/notifications>web-platform-tests notifications/</a> (<a href=https://github.com/w3c/web-platform-tests/labels/notifications>ongoing work</a>)
 !Translation (non-normative): <span title="Simplified Chinese"><a href=https://w3c-html-ig-zh.github.io/notifications/whatwg/ lang=zh hreflang=zh rel=alternate>简体中文</a></span>
 </pre>