LayoutTests/editing/execCommand/nsresponder-indent.html

<script>
if (window.testRunner)
     testRunner.dumpEditingCallbacks();
</script>
<p>This tests the NSResponder method indent:.  You should see an indented 'foo' below.</p>
<div id="div" contenteditable="true">foo</div>

<script>
var div = document.getElementById("div");
var sel = window.getSelection();

sel.setPosition(div, 0);

document.execCommand("Indent");
</script>