"progress" and "stalled" events make no sense in context of MSE: https://github.com/w3c/media-source/issues/88 and hence they will likely be removed soon: https://w3c.github.io/media-source/#h-note-19
Created attachment 431089 [details] Patch
<rdar://problem/79454993>
Comment on attachment 431089 [details] Patch LGTM, r+ conditional on tests not regressing.
Created attachment 437419 [details] Patch
Uploaded a new version of the patch. It doesn't require additional review because only a gardening-like change in the expectations of imported/w3c/web-platform-tests/media-source/mediasource-append-buffer-expected.html has been added, in order to avoid regressions in the tests.
Committed r282059 (241359@main): <https://commits.webkit.org/241359@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 437419 [details].
(In reply to EWS from comment #6) > Committed r282059 (241359@main): <https://commits.webkit.org/241359@main> > > All reviewed patches have been landed. Closing bug and clearing flags on > attachment 437419 [details]. This made the test media/media-source/media-source-stalled-holds-sleep-assertion.html to timeout. Check bug 229979