We incorrectly use a new WhitespaceAttacher for <content> elements during RebuildLayoutTree. We should instead handle it like display:contents.
The following revision refers to this bug: https://chromium.googlesource.com/chromium/src.git/+/157d9c65bb9a5b9c5fb0fb37543830679e1846d4 commit 157d9c65bb9a5b9c5fb0fb37543830679e1846d4 Author: Rune Lillesveen <futhark@chromium.org> Date: Mon Dec 17 19:50:19 2018 Do not use a local WhitespaceAttacher for <content>. <content> elements are not in the flat tree and should be treated like display:contents in order to attach whitespace LayoutText objects correctly. This bug caused regressions for the unification of ComputedStyle storage. Bug: 915669 , 914784 Change-Id: I8afce3bd7fd67244a8784e17acbefc6dd068a8e3 Reviewed-on: https://chromium-review.googlesource.com/c/1379767 Reviewed-by: Morten Stenshorne <mstensho@chromium.org> Commit-Queue: Rune Lillesveen <futhark@chromium.org> Cr-Commit-Position: refs/heads/master@{#617193} [modify] https://crrev.com/157d9c65bb9a5b9c5fb0fb37543830679e1846d4/third_party/blink/renderer/core/dom/element.cc [add] https://crrev.com/157d9c65bb9a5b9c5fb0fb37543830679e1846d4/third_party/blink/web_tests/fast/dom/shadow/content-whitespace-attach-expected.html [add] https://crrev.com/157d9c65bb9a5b9c5fb0fb37543830679e1846d4/third_party/blink/web_tests/fast/dom/shadow/content-whitespace-attach-expected.txt [add] https://crrev.com/157d9c65bb9a5b9c5fb0fb37543830679e1846d4/third_party/blink/web_tests/fast/dom/shadow/content-whitespace-attach.html
Comment 1 by futhark@chromium.org
, Dec 17