Object.getOwnPropertyNames(el.attributes),
                      ["0", "1", "2", "3", "4", "5", "A:B", "c:D", "e:F", "g:h", "I", "j"])
  for (var propName of Object.getOwnPropertyNames(el.attributes)) {
    assert_true(el.attributes[propName] instanceof Attr,
                "el.attributes has an Attr for property name " + propName);
  }
}, "Own property names should include all qualified names for a non-HTML element in an HTML document");

test(function() {
  var doc = document.implementation.createDocumen