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chromium/third_party/blink/web_tests/editing/selection/mixed-editability-9.html 

<!doctype html>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<script src="../assert_selection.js"></script>
<script>
selection_test(
  [
    '<div contenteditable>',
      'ab',
      '<table contenteditable="false"><tbody><tr><td>',
        '<div style="display:inline-block;">',
          '<span>CD</span><span contenteditable="plaintext-only">e|f</span>',
        '</div>',
      '</td></tr></tbody></table>',
      'gh',
    '</div>',
  ],
  selection => selection.modify('move', 'backward', 'lineboundary'),
  [
    '<div contenteditable>',
      'ab|',
      '<table contenteditable="false"><tbody><tr><td>',
        '<div style="display:inline-block;">',
          '<span>CD</span><span contenteditable="plaintext-only">ef</span>',
        '</div>',
      '</td></tr></tbody></table>',
      'gh',
    '</div>',
  ],
  'Home key moves caret crossing over editing boundaries');
</script>