Following r198251 (bug #155275), -[UIWebView mediaPlaybackRequiresUserAction] defaults to NO. But it should default to YES as per <https://developer.apple.com/reference/uikit/uiwebview/1617954-mediaplaybackrequiresuseraction?language=objc>.
<rdar://problem/28680515>
Created attachment 291196 [details] Patch
Comment on attachment 291196 [details] Patch Clearing flags on attachment: 291196 Committed r207160: <http://trac.webkit.org/changeset/207160>
All reviewed patches have been landed. Closing bug.