ControlBar fails with SCRIPT87 Invalid Argument on Edge

Created by: davemevans

When playing http://rdmedia.bbc.co.uk/dash/ondemand/testcard/1/client_manifest-events.mpd, for example, on Edge, an Invalid Argument exception is thrown.

This appears to be because the ControlBar is setting the type attribute on a new <li> element it is creating.

HTMLLIElement.type is obsolete (https://developer.mozilla.org/en/docs/Web/API/HTMLLIElement), but Edge still seems to be doing some input checking. Since type is not one of disc, circle, square etc, it appears to be rejecting the input.

The type attribute is being used to store the mediaType. I would imagine renaming the type attribute would solve the issue.

Predictably, the problem also exists in IE11.