Bug 1609733 [wpt PR 21222] - [IntersectionObserver] Allow Document ar…

…gument to constructor, a=testonly

Automatic update from web-platform-tests
[IntersectionObserver] Allow Document argument to constructor

This implements a behavioral change as described in:

w3c/IntersectionObserver#372

If the 'root' argument to the IntersectionObserver constructor is a
Document, then the observer will clip to the Document's root
scroller. For the top Document, this is the same behavior as the
implicit root. For an iframe Document, this is new behavior which is
unobtainable by other means.

BUG=1015183

Change-Id: I234bfce28ab954bb15b8d157bc22ee2d2469d5e4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2003750
Reviewed-by: Chris Harrelson <chrishtrchromium.org>
Reviewed-by: vmpstr <vmpstrchromium.org>
Commit-Queue: Stefan Zager <szagerchromium.org>
Cr-Commit-Position: refs/heads/master{#734268}

--

wpt-commits: aebf5e72a429c448637c388512bcadd4d4e3fa65
wpt-pr: 21222

UltraBlame original commit: ec3f916509c9a7ac7e2d170db1a1d1e6ac027d55

testing/web-platform/tests/css/css-flexbox/percentage-heights-010.html

@@ -0,0 +1,239 @@
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testing/web-platform/tests/intersection-observer/document-scrolling-element-root.html

@@ -205,27 +205,6 @@
 "
 )
 ;
-root
-=
-iframe
-.
-contentDocument
-.
-scrollingElement
-;
-assert_true
-(
-!
-!
-root
-"
-Root
-element
-exists
-.
-"
-)
-;
 target
 =
 iframe
@@ -275,7 +254,9 @@
 {
 root
 :
-root
+iframe
+.
+contentDocument
 }
 )
 ;
@@ -333,10 +314,6 @@
 is
 the
 document
-'
-s
-scrolling
-element
 .
 "
 )