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chromium/third_party/blink/web_tests/editing/selection/5714333.html 

<body>
<div>This tests to make sure that document.getSelection() is supported and returns a Selection object for the document.</div>
<div id="div">xxx</div>
<div id="console"></div>
<script>
if (window.testRunner)
    testRunner.dumpAsText();
div = document.getElementById("div");
text = div.firstChild;
s = document.getSelection();
s.setBaseAndExtent(text, 1, text, 2);
document.getElementById("console").innerText = "Selection: (" + s.baseNode + ", " + s.baseOffset + ") to (" + s.extentNode + ", " + s.extentOffset + ")";
</script>
</body>