Intent to Ship: Dialog Toggle Events

[Keith Cirkel]

Summary: Dispatch Toggle events on Dialog opne/close

Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1876762

Specification: https://github.com/whatwg/html/pull/10091

Standards Body: HTML WG

Platform coverage: All

Preference: dom.element.dialog.toggle_events.enabled

Devtools bug: N/A

Other browsers:

  - Blink: I2S (https://chromestatus.com/feature/5078613609938944).

  - WebKit: No Signals (https://github.com/WebKit/standards-positions/issues/418).

web-platform-tests: Tests available at https://wpt.fyi/results/html/semantics/interactive-elements/the-dialog-element/toggle-events.tentative.html

Gecko-only tests were introduced: N/A

I have shipped this enabled-by-default in Nightly. Barring any issues I intend this to go live in 133, but I am prepared to flip the flag off if need be. The Firefox implementation is complete and passing all WPTs, and the Chromium implementation is very close to complete with one small patch remaining, and is targeting for a ship in 132 (provided that I2S gets the requisite LGTMs).

If anyone has any concerns please let me know!

Happy browsing.