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chromium/content/test/data/accessibility/html/element-class-id-src-attr.html 

<!--
@WIN-ALLOW:class:*
@WIN-ALLOW:id:*
@WIN-ALLOW:src:*
@WIN-ALLOW:tag:*
@UIA-WIN-ALLOW:ClassName*
@AURALINUX-ALLOW:class:*
@AURALINUX-ALLOW:id:*
@AURALINUX-ALLOW:src:*
@AURALINUX-ALLOW:tag:*
@BLINK-ALLOW:htmlTag*
@BLINK-ALLOW:className*
@MAC-ALLOW:AXDOMClassList=*
@MAC-DENY:AXDOMClassList=[]
@EXECUTE-AND-WAIT-FOR:changeClass()
-->
<!DOCTYPE html>
<html>
  <body>
    <h1 id="headerID" class="headerClass">Image</h1>
    <img id="imageID" class="imageClass" src="greenbox.png" alt="ImageAlt" height="100" width="200">
  </body>
<script>
function changeClass() {
  document.querySelector('h1').className = 'newClass';
  document.title = 'changed-class';
  return 'changed-class';
}
</script>
</html>