title: Background-image in keyframe does not display in Firefox or Internet Explorer
body: <p>I have several animations on my site that I just realized do not even show up in Firefox or Internet Explorer. I have the <code>background-image</code> within the keyframes. I do this because I have different images in different percentages with the animation. </p>
  
  <p>Why doesn't the <code>background-image</code> display within the keyframes in Firefox and Internet Explorer and is there a way to make this work?</p>