<rdar://problem/7337717>
Created attachment 103846 [details] Patch
I suspect that the Windows builds failure is due to WebKit.idl not being touched by the patch.
Comment on attachment 103846 [details] Patch r=me I do wonder if there should be a way for web authors to opt in to this behavior in the browser.
Committed r93014. http://trac.webkit.org/r93014
Windows build fix in r93015. <http://trac.webkit.org/r93015>
Defaults key renamed in r93027. <http://trac.webkit.org/r93027>
As Simon alluded to, there should be a way to opt in to this behavior: Bug 114304