Implement <selectedoption> for StylableSelect #45096
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This patch adds support for the <selectedoption> element to <select>. The <selectedoption> element replaces its innerHTML with the ancestor <select>'s selected <option>s innerHTML whenever the selected <option> changes. This patch implements it using a SynchronousMutationObserver with an IsDescendantOf check, which might be slow. I added some comments in the header with ideas of how to improve the performance. Bug: 1511354 Change-Id: I38be4657e11dd766cef1fc974e16da173fdf829d Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5370555 Reviewed-by: David Baron <[email protected]> Commit-Queue: Joey Arhar <[email protected]> Cr-Commit-Position: refs/heads/main@{#1280361}
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I recreated the [original PR](w3c/html-aam#566) by @josepharhar The `<selectedoption>` element is part of the [customizable select feature](whatwg/html#9799) and is being added to HTML [here](whatwg/html#10633). ## Implementation * WPT tests: web-platform-tests/wpt#45096 * Implementations (link to issue or when done, link to commit): * WebKit: TODO * Gecko: TODO * Blink: https://chromium.googlesource.com/chromium/src/+/18b5eac27b14b409503aa8047cf9358082a0e0df Co-authored-by: Joey Arhar @josepharhar
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This patch adds support for the <selectedoption> element to <select>.
The <selectedoption> element replaces its innerHTML with the ancestor
<select>'s selected <option>s innerHTML whenever the selected <option>
changes.
This patch implements it using a SynchronousMutationObserver with an
IsDescendantOf check, which might be slow. I added some comments in the
header with ideas of how to improve the performance.
Bug: 1511354
Change-Id: I38be4657e11dd766cef1fc974e16da173fdf829d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5370555
Reviewed-by: David Baron <[email protected]>
Commit-Queue: Joey Arhar <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1280361}