Implement custom elements API:
based on the consensus we've reached during Jan F2F:
*** Bug 187907 has been marked as a duplicate of this bug. ***
I came across the tests for custom built-in elements in WPT:
This bug is about the custom elements API overall, is there a bug about built-in elements specifically?
(In reply to Philip Jägenstedt from comment #3)
> I came across the tests for custom built-in elements in WPT:
> This bug is about the custom elements API overall, is there a bug about
> built-in elements specifically?
That would be https://bugs.webkit.org/show_bug.cgi?id=182671 (with the resolution of WONTFIX).
Thanks Ryosuke! I've linked to that bug in https://github.com/web-platform-tests/wpt-metadata/pull/145. It isn't displayed inline on wpt.fyi yet, but would in the future make it clear that these failures are associated with a closed bug and not a new/unknown failure.