Bug 1574282 [wpt PR 18469] - Create Web Platform Tests for Scroll to text, a=testonly

Automatic update from web-platform-tests
Create Web Platform Tests for Scroll to text

Add a web platform test that performs navigations to a test page with
various targetText parameters and checks if the target page
successfully scrolled as expected. Using a BroadcastChannel is the only
way to communicate whether the target page scrolled, since scroll to
text is specifically restricted from iframes or pages with an opener,
so there's no other way for the test page to track the status of the
child target page.

Bug: 994299
Change-Id: I69243e739c3a7469ac48647508e379f204ccfbf6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1756707
Commit-Queue: Nick Burris <nburrischromium.org>
Reviewed-by: Robert Ma <robertmachromium.org>
Cr-Commit-Position: refs/heads/master{#689453}

--

wpt-commits: 3c56e312080b972189b3dcfe57107b60527bb436
wpt-pr: 18469

UltraBlame original commit: 33a19ec20cf62c07d8337f2772a79808a974290b

Author: marco-c

testing/web-platform/tests/scroll-to-text-fragment/scroll-to-text-fragment-target.html

@@ -0,0 +1,131 @@
+<
+!
+doctype
+html
+>
+<
+title
+>
+Navigating
+to
+a
+text
+fragment
+anchor
+<
+/
+title
+>
+<
+script
+>
+function
+checkScroll
+(
+)
+{
+let
+bc
+=
+new
+BroadcastChannel
+(
+'
+scroll
+-
+to
+-
+text
+-
+fragment
+'
+)
+;
+bc
+.
+postMessage
+(
+{
+didScrollToTarget
+:
+window
+.
+scrollY
+>
+0
+}
+)
+;
+bc
+.
+close
+(
+)
+;
+window
+.
+close
+(
+)
+;
+}
+<
+/
+script
+>
+<
+style
+>
+body
+{
+height
+:
+3200px
+;
+}
+p
+{
+position
+:
+absolute
+;
+top
+:
+3000px
+;
+}
+<
+/
+style
+>
+<
+body
+onload
+=
+"
+checkScroll
+(
+)
+"
+>
+<
+p
+id
+=
+"
+text
+"
+>
+This
+is
+a
+test
+page
+<
+/
+p
+>
+<
+/
+body
+>