layout/style/crashtests/1400926.html

   1 <!DOCTYPE html>
   2 <style>
   3 @keyframes anim {
   4   0% { background-color: black; }
   5   100% { background-color: yellow; }
   6 }
   7 </style>
   8 <script>
   9 document.styleSheets[0].cssRules[0].cssRules[0].style.setProperty('background-color', 'red', 'important');
  10 </script>