It shouldn't have exposed to the web at all. Blink already removed it here: https://src.chromium.org/viewvc/blink?revision=151756&view=revision
rdar://problem/25028481
Created attachment 274144 [details] Patch
Comment on attachment 274144 [details] Patch View in context: https://bugs.webkit.org/attachment.cgi?id=274144&action=review > LayoutTests/ChangeLog:11 > + * fast/css/getPropertyValue-webkit-marquee.html: Is this test still valid? Should it test a <marquee> element now?
Committed r198255: <http://trac.webkit.org/changeset/198255>
see: Intent to remove: overflow: -webkit-marquee https://groups.google.com/a/chromium.org/forum/#!topic/blink-dev/HSiFTKnMy4Q
fast/css/getPropertyValue-webkit-marquee.html has been failing since this change See: https://bugs.webkit.org/show_bug.cgi?id=155544