mozilla-central: changeset 585881:836c9f7cb430f112cedbdbebb83750ec182a3f7a

☠☠ backed out by dec0a179f851 ☠ ☠
author	Ian Kilpatrick <ikilpatrick@chromium.org>
	Sat, 17 Jul 2021 09:55:27 +0000
changeset 585881	836c9f7cb430f112cedbdbebb83750ec182a3f7a
parent 585880	a163466c7f99e6211f4c192a5cc97a02b6a70a60
child 585882	b6444ae3b8239365999053781a62af0e9fad0538
push id	38620
push user	csabou@mozilla.com
push date	Sun, 18 Jul 2021 09:08:29 +0000
treeherder	mozilla-central@cc4e5ea0c986 [default view] [failures only]
perfherder	[talos] [build metrics] [platform microbench] (compared to previous push)
reviewers	testonly
bugs	1720813, 29685, 1225548, 3033195, 902402
milestone	92.0a1
first release with	nightly linux32 cc4e5ea0c986 / 92.0a1 / 20210718090829 / files nightly linux64 cc4e5ea0c986 / 92.0a1 / 20210718090829 / files nightly mac cc4e5ea0c986 / 92.0a1 / 20210718090829 / files nightly win32 cc4e5ea0c986 / 92.0a1 / 20210718090829 / files nightly win64 cc4e5ea0c986 / 92.0a1 / 20210718090829 / files
last release without	nightly linux32 b02183638a54 / 92.0a1 / 20210717093616 / files nightly linux64 b02183638a54 / 92.0a1 / 20210717093616 / files nightly mac b02183638a54 / 92.0a1 / 20210717093616 / files nightly win32 b02183638a54 / 92.0a1 / 20210717093616 / files nightly win64 b02183638a54 / 92.0a1 / 20210717093616 / files

Bug 1720813 [wpt PR 29685] - [LayoutNG] Consider OOF positioned nodes as IsManagedByLayoutNG., a=testonly Automatic update from web-platform-tests [LayoutNG] Consider OOF positioned nodes as IsManagedByLayoutNG. positioned: fixed NG elements whose containing block was the LayoutView had issues (the legacy kind) with scrollbars. We can avoid these issues by letting IsManagedByLayoutNG return true when OOF. These are basically "managed" by NG as they are laid out via. the NGOutOfFlowLayoutPart. The other callers of IsManagedByLayoutNG should also be fine with this change. 1) https://source.chromium.org/chromium/chromium/src/+/main:third_party/blink/renderer/core/frame/local_frame_view.cc;l=1539?q=ismanagedbylayoutng&ss=chromium Should be fine, OOF doesn't need to be pre-laid-out. 2) https://source.chromium.org/chromium/chromium/src/+/main:third_party/blink/renderer/core/layout/depth_ordered_layout_object_list.cc;l=53?q=ismanagedbylayoutng&ss=chromium Should also be fine as OOF? Bug: 1225548 Change-Id: I42c4551382553ea52edc5f2ada94ce74d570c6bc Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3033195 Reviewed-by: Morten Stenshorne <mstensho@chromium.org> Commit-Queue: Ian Kilpatrick <ikilpatrick@chromium.org> Cr-Commit-Position: refs/heads/master@{#902402} -- wpt-commits: 43315228ce863f064e2702e22804ecd381e5da70 wpt-pr: 29685

new file mode 100644
--- /dev/null
+++ b/testing/web-platform/tests/css/css-position/position-absolute-dynamic-auto-overflow.html
@@ -0,0 +1,14 @@
+<!DOCTYPE html>
+<link rel="match" href="../reference/ref-filled-green-100px-square.xht">
+<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=1225548">
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+<div style="position: fixed; background: red; max-height: 150px; overflow-y: auto;">
+  <div id="target" style="width: 100px; background: green;"></div>
+</div>
+<script>
+document.body.offsetTop;
+const target = document.getElementById('target');
+target.style.height = '200px';
+document.body.offsetTop;
+target.style.height = '100px';
+</script>