Disallow recursive custom element constructions #20465
Merged
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
With this CL, recursive custom element constructions are no
longer allowed. I.e. this will now only run the constructor once:
class extends HTMLElement {
constructor() {
super();
customElements.upgrade(this);
}
}
Previously, the code and spec had a bug which caused the above
code snippet to infinitely recurse. In [1] the spec has changed,
to set the custom element state to "failed" before the constructor
is called. With this change in place, recursive calls will
early-out at step #2 (of [2]), and avoid the recursion.
[1] whatwg/html#5126
[2] https://html.spec.whatwg.org/multipage/custom-elements.html#upgrades
Bug: 966472
Change-Id: I76e88c0b70132eee2482c304ef9e727ae1fe8fc7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1931644
Reviewed-by: Kent Tamura <tkent@chromium.org>
Commit-Queue: Mason Freed <masonfreed@chromium.org>
Auto-Submit: Mason Freed <masonfreed@chromium.org>
Cr-Commit-Position: refs/heads/master@{#727841}