Implement <popup> focus, autofocus, delegatesfocus #28827
Merged
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This CL implements most of the focus behavior for <popup. This includes
the default focus behavior, plus the implementation of the autofocus
and delegatesfocus attributes. See [1] for more context. A WPT is
added here that exercised all new functionality.
[1] https://open-ui.org/components/popup.research.explainer
Bug: 1168738
Change-Id: I6ec607c7dc250c8edb0d8bd4245e0f21303599a8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2869490
Commit-Queue: Mason Freed <masonf@chromium.org>
Reviewed-by: Ionel Popescu <iopopesc@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#879576}