This attribute is being added to the spec, with tests:
It would be great if this simple addition were made to WebKit, so that web developers have fewer differences between browsers to accidentally depend on.
Similar Gecko bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1706275
Created attachment 427031 [details]
Adds the IDL attribute
Committed r276585 (237021@main): <https://commits.webkit.org/237021@main>
All reviewed patches have been landed. Closing bug and clearing flags on attachment 427031 [details].