I believe it should have, according to the spec.
Created attachment 396002 [details] Patch
Created attachment 396012 [details] Patch
Comment on attachment 396012 [details] Patch r=me
Committed r259835: <https://trac.webkit.org/changeset/259835>
<rdar://problem/61545983>
*** Bug 186888 has been marked as a duplicate of this bug. ***
*** Bug 202044 has been marked as a duplicate of this bug. ***