custom-elements/reactions/HTMLMetaElement.html

<!DOCTYPE html>
<title>Custom Elements: CEReactions on HTMLMetaElement interface</title>
<link rel="author" title="Intel" href="http://www.intel.com">
<meta name="assert" content="name, httpEquiv, content of
  HTMLMetaElement interface must have CEReactions">
<meta name="help" content="https://html.spec.whatwg.org/#the-meta-element">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="../resources/custom-elements-helpers.js"></script>
<script src="./resources/reactions.js"></script>

<script>

function getParentElement() {
  return document.head;
}

function setAttributes(instance, attribute, value) {
  instance.setAttribute(attribute, value);
}

testReflectAttributeWithDependentAttributes(
  'name', 'name', 'description',
  'keywords', 'name on HTMLMetaElement', 'meta',
  getParentElement,
  instance => setAttributes(instance, 'content', 'HTMLMetaElement'),
  HTMLMetaElement
);
testReflectAttributeWithDependentAttributes(
  'content', 'content', 'name1',
  'name2', 'content on HTMLMetaElement', 'meta',
  getParentElement, instance => setAttributes(instance, 'name', 'author'),
  HTMLMetaElement
);

test(() => {
  let element = define_build_in_custom_element(
    ['http-equiv'], HTMLMetaElement, 'meta'
  );
  let instance = document.createElement('meta', { is: element.name });

  assert_array_equals(element.takeLog().types(), ['constructed']);
  document.head.appendChild(instance);
  assert_array_equals(element.takeLog().types(), ['connected']);
  instance['content'] = '300';
  instance['httpEquiv'] = 'refresh';
  let logEntries = element.takeLog();
  assert_array_equals(logEntries.types(), ['attributeChanged']);
  assert_attribute_log_entry(logEntries.last(), {
    name: 'http-equiv', oldValue: null, newValue: 'refresh', namespace: null
  });
}, 'httpEquiv on HTMLMetaElement must enqueue an attributeChanged'
  + ' reaction when adding a new attribute');

test(() => {
  let element = define_build_in_custom_element(
    ['http-equiv'], HTMLMetaElement, 'meta'
  );
  let instance = document.createElement('meta', { is: element.name });
  document.head.appendChild(instance);

  assert_array_equals(element.takeLog().types(), ['constructed', 'connected']);
  instance['content'] = 'text/html; charset=UTF-8';
  instance['httpEquiv'] = 'content-type';
  assert_array_equals(element.takeLog().types(), ['attributeChanged']);
  instance['content'] = '300';
  instance['httpEquiv'] = 'refresh';
  let logEntries = element.takeLog();
  assert_array_equals(logEntries.types(), ['attributeChanged']);
  assert_attribute_log_entry(logEntries.last(), {
    name: 'http-equiv', oldValue: 'content-type',
    newValue: 'refresh', namespace: null
  });
}, 'httpEquiv on HTMLMetaElement must enqueue an attributeChanged'
  + ' reaction when replacing an existing attribute');

</script>