src/third_party/WebKit/LayoutTests/fast/dynamic/focus-clear-resolver-crash.html

   1 <!DOCTYPE html>
   2 <style>
   3 div { color: pink }
   4 :focus { outline: none }
   5 :focus #inner { color: green }
   6 </style>
   7 <div id="focused" tabIndex="1" onfocus="document.styleSheets[0].deleteRule(0);">
   8     <span id="inner">This text should be green - no crash.</span>
   9 </div>
  10 <script>
  11 document.getElementById("focused").focus();
  12 </script>