#4828 - Implement onbeforematch event for tabs/accordions/etc (on hold)

Identifier #4828
Issue type Feature request or suggestion
Title Implement onbeforematch event for tabs/accordions/etc (on hold)
Status Open
Tags

Type: Standards compliance (custom)

Handling member Deleted
Addon core
Description The W3C is specifying an onbeforematch event, which helps reveal content hidden under different tabs/etc when using the "find in page" feature in browsers.

https://groups.google.com/a/chromium.org/g/blink-dev/c/e8n8Z5dzMs0/m/SWTK7yL1AAAJ?pli=1

Implement this for Composr's own tab implementation, and other UIs that hide content.
Steps to reproduce

Funded? No
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