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chromium/third_party/blink/web_tests/editing/execCommand/insert-paragraph-into-table.html 

<!doctype html>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<script src="../assert_selection.js"></script>
<script>
//This is a test case for crbug.com/535510
test(()=> assert_selection(
  [
  '<div contenteditable>',
    '<table>',
      '<tbody>',
        '<td style="display:inline-block">',
          '<ruby><rt>a|</rt></ruby>',
        '</td>',
      '</tbody>',
    '</table>^',
  '</div>'],
  'InsertParagraph',
  [
  '<div contenteditable>',
    '<table>',
      '<tbody>',
        '<tr><td style="display:inline-block">',
          '<ruby><rt>a</rt></ruby>',
        '</td></tr>',
        '<tr><font size="1">|<br></font></tr>',
      '</tbody>',
    '</table>',
  '</div>'
  ]),
  "This InsertParagraph non-table layout item into table layout.");
</script>