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chromium/third_party/blink/web_tests/external/wpt/selection/toString-ff-bug-001.html 

<!doctype html>
<title>Can serialize a range which starts at the end of an element</title>
<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1571517">
<link rel="author" title="Emilio Cobos Álvarez" href="mailto:[email protected]">
<link rel="author" title="Mozilla" href="https://mozilla.org">
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<table>
  <tr>
    <td id="left">Foo</td>
    <td id="right">Hello</td>
  </tr>
</table>
<script>
test(function() {
  let s = getSelection();
  let r = new Range();
  r.setStart(document.getElementById("left"), 1);
  r.setEnd(document.getElementById("right").firstChild, 4);
  s.addRange(r);
  assert_equals(s.toString().trim(), "Hell");
}, "Can serialize a range which starts at the end of an element");
</script>