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chromium/third_party/blink/web_tests/external/wpt/selection/addRange.htm 

<!DOCTYPE HTML>
<meta charset=utf-8>
<title>Selection: Add a range to the selection</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
window.onload = function() {
  test(function() {
    var selection = window.getSelection();
    var p1 = document.getElementById("p1");

    var range = document.createRange();
    range.selectNode(p1);
    selection.addRange(range);

    assert_equals(selection.anchorNode, range.startContainer);
    assert_equals(selection.anchorOffset, range.startOffset);
    assert_equals(selection.focusNode, range.endContainer);
    assert_equals(selection.focusOffset, range.endOffset);
    assert_equals(selection.isCollapsed, range.collapsed);
    assert_equals(selection.rangeCount, 1);
    assert_equals(selection.toString(), p1.firstChild.nodeValue);
  });
};
</script>
<div id=log></div>
<p id="p1">Add a range to the selection</p>
</body>
</html>