In the same way that we add a CSS class to highlight differing content in diff and conflict views, we should also be adding accessibility markup so that screen-reading technology can say something like, "added text: 'blah'".
For comparison, a screen reader might say "link: 'link label'" when reading an inline link.
We kinda do now with the del/ins markup which is now read by JAWS and NVDA ... and I've heard VoiceOver on iOS at least also indicates it. I mentioned this in T280749.
I've heard VoiceOver on iOS at least also indicates it
I can confirm this. Just tested and ins and del now work on iOS, but not yet on macOS (although I haven't updated to the new macOS major version yet, so maybe it works in the new major version).
[Edit] Tested new version of macOS and it does not yet support ins and del.
Tested on Safari 17 and macOS Sonoma 14, and finally ins and del are supported ! If you use the inline diff mode now, it's a lot easier to follow in my opinion.
Also confirming that del/ins are read by JAWS and NVDA. Tested both with Firefox and Chrome. I'll close this task as resolved.
Just in case anyone else needs ins/del. I later discovered that this only works in VoiceOver due to the usage of the title= attribute. Without that attribute it ignores ins and del. I have no idea why. It doesn't make much sense. It could be an implementation error on the VoiceOver side.