Dialog BeforeToggle/Toggle events

[keithamus]

Request for Mozilla Position on an Emerging Web Specification

• Specification title: dispatch toggleevents for dialog open/close
• Specification or proposal URL (if available): dispatch toggleevents for dialog open/close whatwg/html#10091
• Explainer URL (if available):
• Proposal author(s) (@-mention GitHub accounts): @keithamus
• Caniuse.com URL (optional):
• Bugzilla URL (optional): https://bugzilla.mozilla.org/show_bug.cgi?id=1876762
• Mozillians who can provide input (optional): @smaug----
• WebKit standards-position: dispatch toggleevents for dialog open/close WebKit/standards-positions#418

Other information

This is kind of retroactively ensuring we catalogue the standards position for this for the due diligence on spec, but it's already shipping in Firefox nightly.

[smaug----]

This was discussed already at 2023 TPAC. Seems a fine small addition.