I am having the same problems as outlined in this post (basically that ios7 has a rendering bug and flickering 'borders' appear around some objects), but i can not get the posted solution (2nd post from the bottom) to work for me.
I put this in the <head>
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no" />, and it gets rid of the squiggly render bug, but the animation plays at 100%, the size at which i designed it in edge, instead of resizing to fit the frame like it usually does. if i resize the animatinon, setting the scale= values to .25, so it fits entirely in the iphone window, the outlines reappear.
Any help would be much appreciated!