[insertparagraph-in-non-splittable-element.html]
  [insertParagraph in iframe of <div><iframe srcdoc="abc"></iframe></div>]
    expected: FAIL

  [insertParagraph in optgroup of <div><select><optgroup><option>abc</option></optgroup></select></div>]
    expected: FAIL

  [insertParagraph in select of <div><select><option>abc</option></select></div>]
    expected: FAIL
