FWIW, in nightly Gecko builds we have an implementation of canPlayType per spec. It parses the "codecs" parameter of the provided MIME type, so we can answer "no", "maybe" or "probably" depending on what's in the type. E.g.:<br>
<a href="http://mxr.mozilla.org/mozilla-central/source/content/media/video/test/can_play_type_ogg.js">http://mxr.mozilla.org/mozilla-central/source/content/media/video/test/can_play_type_ogg.js</a><br clear="all"><br>Rob<br>
-- <br>"He was pierced for our transgressions, he was crushed for our iniquities; the punishment that brought us peace was upon him, and by his wounds we are healed. We all, like sheep, have gone astray, each of us has turned to his own way; and the LORD has laid on him the iniquity of us all." [Isaiah 53:5-6]<br>