<html>
<head>
<script>
if (window.testRunner)
  testRunner.dumpAsText();
window.onload = function() {
    document.designMode = 'on';
    document.execCommand('selectAll');
    document.execCommand('indent');
}
</script>
<style>
* {
    -webkit-appearance: checkbox;
}
</style>
</head>
<body>Pass if no assert in debug.<div>foo</div></body>
</html>