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chromium/third_party/blink/web_tests/external/wpt/dom/ranges/Range-attributes.html 

<!DOCTYPE html>
<title>Range attributes</title>
<link rel="author" title="Ms2ger" href="mailto:[email protected]">
<meta name=timeout content=long>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<div id=log></div>
<script>
test(function() {
  var r = document.createRange();
  assert_equals(r.startContainer, document)
  assert_equals(r.endContainer, document)
  assert_equals(r.startOffset, 0)
  assert_equals(r.endOffset, 0)
  assert_true(r.collapsed)
  r.detach()
  assert_equals(r.startContainer, document)
  assert_equals(r.endContainer, document)
  assert_equals(r.startOffset, 0)
  assert_equals(r.endOffset, 0)
  assert_true(r.collapsed)
})
</script>