I am trying to get MediaElements to work responsively over multiple browsers.
I am testing it at this link.
http://testing.grappler.tk/mediaelement-js/
It works fine in Chrome. It will not play in FF and when I test it in IE8 it looks like this. In IE8+9 the play button disappears.

Thank you for any help.
After taking more time to test the code in different situations I found that the IE9 button problem was due to some css that the WordPress theme was using.
The IE8 problem was due to FitVids that was loaded with the theme. FitVids was trying to make the
objectresponsive but it was not needed.The Firefox problem of not playing the video was due to MiroVideoConverter. After trying another converter it worked fine.