<!DOCTYPE html>
<html>
<body>
<div contenteditable="true" id="target"><span></span></div>
</body>
<script>
if (window.testRunner)
    testRunner.dumpAsText();
getSelection().collapse(document.getElementById('target'), 0);
document.execCommand('Indent');
document.body.textContent = 'Pass if not crash.';
</script>
</html>