Restrict attachInternals() to be run inside or after the constructor #25402
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Per the discussion at [1], the intention of this change is to prevent calls to attachInternals() prior to the constructor of the custom element having a chance to do so. The spec PR is at [2]. This change is gated behind the DeclarativeShadowDOM flag. With the flag disabled (the default), a use counter is added for checking on the web compatibility of this change. The use counter will measure the cases where attachInternals() is being called in a to-be-outlawed way. [1] WICG/webcomponents#871 (comment) [2] whatwg/html#5909 Bug: 1042130 Change-Id: Iacf97a49133b5f7f44710e5c0287f01cfebe4c44 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2392975 Reviewed-by: Alexei Svitkine <asvitkine@chromium.org> Reviewed-by: Kouhei Ueno <kouhei@chromium.org> Commit-Queue: Mason Freed <masonfreed@chromium.org> Auto-Submit: Mason Freed <masonfreed@chromium.org> Cr-Commit-Position: refs/heads/master@{#806830}
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Per the discussion at [1], the intention of this change is to prevent
calls to attachInternals() prior to the constructor of the custom
element having a chance to do so. The spec PR is at [2].
This change is gated behind the DeclarativeShadowDOM flag. With the
flag disabled (the default), a use counter is added for checking on
the web compatibility of this change. The use counter will measure
the cases where attachInternals() is being called in a to-be-outlawed
way.
[1] WICG/webcomponents#871 (comment)
[2] whatwg/html#5909
Bug: 1042130
Change-Id: Iacf97a49133b5f7f44710e5c0287f01cfebe4c44
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2392975
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Reviewed-by: Kouhei Ueno <kouhei@chromium.org>
Commit-Queue: Mason Freed <masonfreed@chromium.org>
Auto-Submit: Mason Freed <masonfreed@chromium.org>
Cr-Commit-Position: refs/heads/master@{#806830}