Test playing video in a detached document

Many tests don't insert the media element into a document and this
doesn't seem to be a problem. However, all of Opera 20 (Blink), Safari 7
(WebKit), Firefox 30 (Gecko) and IE11 (Trident) fail this test. Only
Opera 12.16 (Presto) passes it, but only after playing to the end; it
seems like timeupdate events aren't being fired correctly.