Media Fragments - Video fragment temporal loop

I would like to propose looping of video fragments as well as entire videos.

When rendering the following video element (in Chrome 33 and Firefox 27)

<video loop autoplay>
    <source src="video.webm#t=00:00.000,00:04.395" type="video/webm" />
     Your browser doesn't support the <code>video</code> element.
</video>


I expect it to loop the portion of the video from the start to 0 minutes 4
seconds.
But instead it pauses at 0 minutes 4 seconds.

If you can, please help me address this issue in the correct place.
Thank you!