The computed height for an embedded video is at 0px for Internet Explorer when the data-height for the .autosized-media iframe is set to 500. But on other browsers (Chrome, Safari, Firefox) the computed height matches the data-height.
When I manually set the height of the iframe to 500px, the video is visible and usable on IE. Until that point, the video is not visible (due to the 0px height).
I’ve tried to keep the sample as simple as possible, attached to jsfiddle below.
Screenshot from IE11 / Win7 on VMWare (IE Version 11.0.9600.16428):
Screenshot from Chrome on Mac (Chrome Version 41.0.2272.118 (64-bit)):