The spec went to Candidate Recommendation in July. And IE10 and Opera 12.10 both shipped it unprefixed (IE10 keeps ms version too).
I intend to unprefix without preserving the prefixed properties.
Created attachment 202895 [details]
Comment on attachment 202895 [details]
Attachment 202895 [details] did not pass efl-ews (efl):
https://trac.webkit.org/r150695 with EFL fix.