[attribute-changed-callback-set-attribute-test.html]
  type: testharness
  [Test attributeChanged callback of the custom element that extends some HTML element. Test that the callback is called]
    expected: FAIL

  [Test attributeChanged callback is called if attribute is set by method classList.add(). The custom element extends some HTML element.]
    expected: FAIL

  [Test attributeChanged callback arguments if attribute value is set by method setAttribute(). The custom element extends some HTML element.]
    expected: FAIL

  [Test attributeChanged callback is called if attribute value is set by method setAttribute(). The document has browsing context. The custom element extends some HTML element.]
    expected: FAIL

  [Test attributeChanged callback arguments if attribute value is set by method setAttribute(). The document has browsing context. The custom element extends some HTML element.]
    expected: FAIL

