Automatic update from web-platform-tests
textarea: Always add a placeholder break to empty elements
This CL ensures that empty TEXTAREA elements always contain a
placeholder break element. This provides a consistent line-height and
baseline, particularly for non-editable textareas (e.g., disabled,
read-only, or within an inert subtree) which previously might have
collapsed or had incorrect layout metrics.
Although the placeholder break is primarily needed for non-editable
states, it is added unconditionally because an element's editability
can change dynamically (e.g., via the 'inert' attribute on an ancestor),
making conditional management complex.
Implementation details:
- HTMLTextAreaElement: Injects the placeholder break into the inner
editor upon creation if the value is empty.
- TextControlElement: Manages the lifecycle of the placeholder break
when the value changes.
- RemoveNodeCommand: Updated to correctly handle 'ref_child' when it
points to a placeholder break, ensuring correct undo/redo behavior.
- SelectionController: Updated 'IsEditableBoxEmpty' to check the
actual text content instead of just 'HasChildren()', accounting for
the internal placeholder break.
trees. It affects <textarea> with a value ending with `\n`.
AX-Relnotes: Placeholder break elements are dropped from accessibility
Bug: 510170707
Change-Id: I5871a6890ceb50945b8995293fcbaafa7c6e25c5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7875830
Reviewed-by: David Tseng <dtseng@chromium.org>
Commit-Queue: Kent Tamura <tkent@chromium.org>
Reviewed-by: Koji Ishii <kojii@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1645788}
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wpt-commits: 640522942a690dae86b3deba5abaae021704e9a3
wpt-pr: 60569
Kent Tamura
9c9c4b56b8