[iframe-frameborder.html]
  [<iframe frameborder=""></iframe>]
    expected: FAIL

  [<iframe frameborder="-0"></iframe>]
    expected: FAIL

  [<iframe frameborder="0.5"></iframe>]
    expected: FAIL

  [<iframe frameborder="0.5e1"></iframe>]
    expected: FAIL

  [<iframe frameborder="none"></iframe>]
    expected: FAIL

  [<iframe frameborder="error"></iframe>]
    expected: FAIL