Bug 302049 – AX: `contextmenu` event is not fired for either keyboard event or AT event (e.g. VoiceOver's VO+Shift+M) in iframes

• Component: Accessibility
• Status: RESOLVED FIXED

[James Craig]

AX: `contextmenu` event is not fired for either keyboard event or AT event (e.g. VoiceOver's VO+Shift+M)

A colleague at Slack reached out to mention their web app is lacking functionality related to context menus, due to this WebKit bug.

Keyboard Access
- Ctrl+Return is the AppKit convention for triggering a contextual menu in native apps, but this doesn't trigger the menu or the `contextmenu` event in Safari/WebKit 

Assistive Technology
- Easiest example is probably VoiceOver's VO+Shift+M (depending on VO settings, Ctrl+Opt+Shift+M) which triggers the menu as intended, but doesn't fire the `contextmenu` event. 

Both of these should be fixed in WebKit.
https://codepen.io/toddlr/pen/MYKdJqO?editors=1111

[Radar WebKit Bug Importer]

<rdar://problem/164128676>

[James Craig]

Created attachment 477317 [details]
screen shot showing platform convention

[Tyler Wilcock]

I can reproduce the issue only when the element is inside an iframe (let me know if anyone experiences otherwise).

[Tyler Wilcock]

Pull request: https://github.com/WebKit/WebKit/pull/62278

[EWS]

Committed 310897@main (38d9120295b6): <https://commits.webkit.org/310897@main>

Reviewed commits have been landed. Closing PR #62278 and removing active labels.