tree 8e76e29d7406b8f1cfcb8394bdf6dcbf1ed9fb44
parent a0038b4dd3636b518fe268ba097a92b9ad558842
author Dominic Farolino <dom@chromium.org> 1709176640 -0800
committer Blink WPT Bot <blink-w3c-test-autoroller@chromium.org> 1709177255 -0800

DOM: Add WPTs for removing steps

This CL adds WPTs for removing steps, to ensure that script is never
executed during the removing steps hook [1], which are invoked
synchronously during per-node removal (that is, they are not batched,
but run this way per-node).

This CL:
 1. Augments the existing iframe removing steps WPT, to include
    `pagehide` events. At the time of writing this, all browsers deviate
    from the HTML Standard, and fail this test.
 2. Adds new tests for `<input>` and `<button>` to assert that when they
    are focused and subsequently removed from the DOM, the `blur` event
    is *not* fired, per the HTML Standard. Chromium fails this test,
    while Safari and Firefox pass it.

[1]: https://dom.spec.whatwg.org/#concept-node-remove-ext

Bug: 40150299
Change-Id: I0aa43755ccac8ea432056800c5c4167d8e4460e8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5323158
Commit-Queue: Dominic Farolino <dom@chromium.org>
Reviewed-by: Mason Freed <masonf@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1266801}