<script>
if (window.testRunner)
     testRunner.dumpEditingCallbacks();
</script>
<body>
<div contenteditable="true">
OnlyThe<span id="base" style="font-weight:bold;" contenteditable="false">Bold</span>TextShould<span id="extent">Be</span>Selected
</div>
<script>
var s = window.getSelection();
var base = document.getElementById("base");
var extent = document.getElementById("extent");
s.setBaseAndExtent(base, 0, extent, 0);
</script>
</body>