It is 1:1 with ShadowRoot and has virtually no functionality.
Created attachment 208801 [details] yo
Comment on attachment 208801 [details] yo Attachment 208801 [details] did not pass gtk-ews (gtk): Output: http://webkit-queues.appspot.com/results/1469171
Comment on attachment 208801 [details] yo Attachment 208801 [details] did not pass gtk-ews (gtk): Output: http://webkit-queues.appspot.com/results/1465376
Created attachment 208803 [details] another
Comment on attachment 208803 [details] another Attachment 208803 [details] did not pass gtk-ews (gtk): Output: http://webkit-queues.appspot.com/results/1474124
https://trac.webkit.org/r154106