custom-elements/attribute-changed-callback.html - external/w3c/web-platform-tests - Git at Google

 <!DOCTYPE html>
 <html>
 <head>
 <title>Custom Elements: attributeChangedCallback</title>
 <meta name="author" title="Ryosuke Niwa" href="mailto:rniwa@webkit.org">
 <meta name="assert" content="attributeChangedCallback must be enqueued whenever custom element's attribute is added, changed or removed">
 <link rel="help" href="https://w3c.github.io/webcomponents/spec/custom/#dfn-attribute-changed-callback">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <script src="resources/custom-elements-helpers.js"></script>
 </head>
 <body>
 <div id="log"></div>
 <parser-created-element title></parser-created-element>
 <script>

 var customElement = define_new_custom_element(['title', 'id', 'r']);

 test(function () {
     const instance = document.createElement(customElement.name);
     assert_array_equals(customElement.takeLog().types(), ['constructed']);

     instance.setAttribute('title', 'foo');
     assert_equals(instance.getAttribute('title'), 'foo');
     var logEntries = customElement.takeLog();
     assert_array_equals(logEntries.types(), ['attributeChanged']);
     assert_attribute_log_entry(logEntries.last(), {name: 'title', oldValue: null, newValue: 'foo', namespace: null});

     instance.removeAttribute('title');
     assert_equals(instance.getAttribute('title'), null);
     var logEntries = customElement.takeLog();
     assert_array_equals(logEntries.types(), ['attributeChanged']);
     assert_attribute_log_entry(logEntries.last(), {name: 'title', oldValue: 'foo', newValue: null, namespace: null});
 }, 'setAttribute and removeAttribute must enqueue and invoke attributeChangedCallback');

 test(function () {
     var instance = document.createElement(customElement.name);
     assert_array_equals(customElement.takeLog().types(), ['constructed']);

     instance.setAttributeNS('http://www.w3.org/2000/svg', 'title', 'hello');
     assert_equals(instance.getAttribute('title'), 'hello');
     var logEntries = customElement.takeLog();
     assert_array_equals(logEntries.types(), ['attributeChanged']);
     assert_attribute_log_entry(logEntries.last(), {name: 'title', oldValue: null, newValue: 'hello', namespace: 'http://www.w3.org/2000/svg'});

     instance.removeAttributeNS('http://www.w3.org/2000/svg', 'title');
     assert_equals(instance.getAttribute('title'), null);
     var logEntries = customElement.takeLog();
     assert_array_equals(logEntries.types(), ['attributeChanged']);
     assert_attribute_log_entry(logEntries.last(), {name: 'title', oldValue: 'hello', newValue: null, namespace: 'http://www.w3.org/2000/svg'});
 }, 'setAttributeNS and removeAttributeNS must enqueue and invoke attributeChangedCallback');

 test(function () {
     var instance = document.createElement(customElement.name);
     assert_array_equals(customElement.takeLog().types(), ['constructed']);

     var attr = document.createAttribute('id');
     attr.value = 'bar';
     instance.setAttributeNode(attr);

     assert_equals(instance.getAttribute('id'), 'bar');
     var logEntries = customElement.takeLog();
     assert_array_equals(logEntries.types(), ['attributeChanged']);
     assert_attribute_log_entry(logEntries.last(), {name: 'id', oldValue: null, newValue: 'bar', namespace: null});

     instance.removeAttributeNode(attr);
     assert_equals(instance.getAttribute('id'), null);
     var logEntries = customElement.takeLog();
     assert_array_equals(logEntries.types(), ['attributeChanged']);
     assert_attribute_log_entry(logEntries.last(), {name: 'id', oldValue: 'bar', newValue: null, namespace: null});
 }, 'setAttributeNode and removeAttributeNode must enqueue and invoke attributeChangedCallback for an HTML attribute');

 test(function () {
     const instance = document.createElement(customElement.name);
     assert_array_equals(customElement.takeLog().types(), ['constructed']);

     const attr = document.createAttributeNS('http://www.w3.org/2000/svg', 'r');
     attr.value = '100';
     instance.setAttributeNode(attr);

     assert_equals(instance.getAttribute('r'), '100');
     var logEntries = customElement.takeLog();
     assert_array_equals(logEntries.types(), ['attributeChanged']);
     assert_attribute_log_entry(logEntries.last(), {name: 'r', oldValue: null, newValue: '100', namespace: 'http://www.w3.org/2000/svg'});

     instance.removeAttributeNode(attr);
     assert_equals(instance.getAttribute('r'), null);
     var logEntries = customElement.takeLog();
     assert_array_equals(logEntries.types(), ['attributeChanged']);
     assert_attribute_log_entry(logEntries.last(), {name: 'r', oldValue: '100', newValue: null, namespace: 'http://www.w3.org/2000/svg'});
 }, 'setAttributeNode and removeAttributeNS must enqueue and invoke attributeChangedCallback for an SVG attribute');

 test(function () {
     const instance = document.createElement(customElement.name);
     assert_array_equals(customElement.takeLog().types(), ['constructed']);

     instance.toggleAttribute('title', true);
     assert_equals(instance.hasAttribute('title'), true);
     var logEntries = customElement.takeLog();
     assert_array_equals(logEntries.types(), ['attributeChanged']);
     assert_attribute_log_entry(logEntries.last(), {name: 'title', oldValue: null, newValue: '', namespace: null});

     instance.toggleAttribute('title');
     assert_equals(instance.hasAttribute('title'), false);
     var logEntries = customElement.takeLog();
     assert_array_equals(logEntries.types(), ['attributeChanged']);
     assert_attribute_log_entry(logEntries.last(), {name: 'title', oldValue: '', newValue: null, namespace: null});
 }, 'toggleAttribute must enqueue and invoke attributeChangedCallback');

 test(function () {
     const callsToOld = [];
     const callsToNew = [];
     class CustomElement extends HTMLElement { }
     CustomElement.prototype.attributeChangedCallback = function (...args) {
         callsToOld.push(create_attribute_changed_callback_log(this, ...args));
     }
     CustomElement.observedAttributes = ['title'];
     customElements.define('element-with-mutated-attribute-changed-callback', CustomElement);
     CustomElement.prototype.attributeChangedCallback = function (...args) {
         callsToNew.push(create_attribute_changed_callback_log(this, ...args));
     }

     const instance = document.createElement('element-with-mutated-attribute-changed-callback');
     instance.setAttribute('title', 'hi');
     assert_equals(instance.getAttribute('title'), 'hi');
     assert_array_equals(callsToNew, []);
     assert_equals(callsToOld.length, 1);
     assert_attribute_log_entry(callsToOld[0], {name: 'title', oldValue: null, newValue: 'hi', namespace: null});
 }, 'Mutating attributeChangedCallback after calling customElements.define must not affect the callback being invoked');

 test(function () {
     const calls = [];
     class CustomElement extends HTMLElement {
         attributeChangedCallback(...args) {
             calls.push(create_attribute_changed_callback_log(this, ...args));
         }
     }
     CustomElement.observedAttributes = ['title'];
     customElements.define('element-not-observing-id-attribute', CustomElement);

     const instance = document.createElement('element-not-observing-id-attribute');
     assert_equals(calls.length, 0);
     instance.setAttribute('title', 'hi');
     assert_equals(calls.length, 1);
     assert_attribute_log_entry(calls[0], {name: 'title', oldValue: null, newValue: 'hi', namespace: null});
     instance.setAttribute('id', 'some');
     assert_equals(calls.length, 1);
     assert_attribute_log_entry(calls[0], {name: 'title', oldValue: null, newValue: 'hi', namespace: null});
 }, 'attributedChangedCallback must not be invoked when the observed attributes does not contain the attribute');

 test(function () {
     const calls = [];
     class CustomElement extends HTMLElement { }
     CustomElement.prototype.attributeChangedCallback = function (...args) {
         calls.push(create_attribute_changed_callback_log(this, ...args));
     }
     CustomElement.observedAttributes = ['title', 'lang'];
     customElements.define('element-with-mutated-observed-attributes', CustomElement);
     CustomElement.observedAttributes = ['title', 'id'];

     const instance = document.createElement('element-with-mutated-observed-attributes');
     instance.setAttribute('title', 'hi');
     assert_equals(calls.length, 1);
     assert_attribute_log_entry(calls[0], {name: 'title', oldValue: null, newValue: 'hi', namespace: null});

     instance.setAttribute('id', 'some');
     assert_equals(calls.length, 1);

     instance.setAttribute('lang', 'en');
     assert_equals(calls.length, 2);
     assert_attribute_log_entry(calls[1], {name: 'lang', oldValue: null, newValue: 'en', namespace: null});
 }, 'Mutating observedAttributes after calling customElements.define must not affect the set of attributes for which attributedChangedCallback is invoked');

 test(function () {
     var calls = [];
     class CustomElement extends HTMLElement { }
     CustomElement.prototype.attributeChangedCallback = function (...args) {
         calls.push(create_attribute_changed_callback_log(this, ...args));
     }
     CustomElement.observedAttributes = { [Symbol.iterator]: function *() { yield 'lang'; yield 'style'; } };
     customElements.define('element-with-generator-observed-attributes', CustomElement);

     var instance = document.createElement('element-with-generator-observed-attributes');
     instance.setAttribute('lang', 'en');
     assert_equals(calls.length, 1);
     assert_attribute_log_entry(calls[0], {name: 'lang', oldValue: null, newValue: 'en', namespace: null});

     instance.setAttribute('lang', 'ja');
     assert_equals(calls.length, 2);
     assert_attribute_log_entry(calls[1], {name: 'lang', oldValue: 'en', newValue: 'ja', namespace: null});

     instance.setAttribute('title', 'hello');
     assert_equals(calls.length, 2);

     instance.setAttribute('style', 'font-size: 2rem');
     assert_equals(calls.length, 3);
     assert_attribute_log_entry(calls[2], {name: 'style', oldValue: null, newValue: 'font-size: 2rem', namespace: null});
 }, 'attributedChangedCallback must be enqueued for attributes specified in a non-Array iterable observedAttributes');

 test(function () {
     var calls = [];
     class CustomElement extends HTMLElement { }
     CustomElement.prototype.attributeChangedCallback = function (...args) {
         calls.push(create_attribute_changed_callback_log(this, ...args));
     }
     CustomElement.observedAttributes = ['style'];
     customElements.define('element-with-style-attribute-observation', CustomElement);

     var instance = document.createElement('element-with-style-attribute-observation');
     assert_equals(calls.length, 0);

     instance.style.fontSize = '10px';
     assert_equals(calls.length, 1);
     assert_attribute_log_entry(calls[0], {name: 'style', oldValue: null, newValue: 'font-size: 10px;', namespace: null});

     instance.style.fontSize = '20px';
     assert_equals(calls.length, 2);
     assert_attribute_log_entry(calls[1], {name: 'style', oldValue: 'font-size: 10px;', newValue: 'font-size: 20px;', namespace: null});

 }, 'attributedChangedCallback must be enqueued for style attribute change by mutating inline style declaration');

 test(function () {
     var calls = [];
     class CustomElement extends HTMLElement { }
     CustomElement.prototype.attributeChangedCallback = function (...args) {
         calls.push(create_attribute_changed_callback_log(this, ...args));
     }
     CustomElement.observedAttributes = ['title'];
     customElements.define('element-with-no-style-attribute-observation', CustomElement);

     var instance = document.createElement('element-with-no-style-attribute-observation');
     assert_equals(calls.length, 0);
     instance.style.fontSize = '10px';
     assert_equals(calls.length, 0);
     instance.title = 'hello';
     assert_attribute_log_entry(calls[0], {name: 'title', oldValue: null, newValue: 'hello', namespace: null});
 }, 'attributedChangedCallback must not be enqueued when mutating inline style declaration if the style attribute is not observed');

 test(function () {
     var calls = [];
     class CustomElement extends HTMLElement { }
     CustomElement.prototype.attributeChangedCallback = function (...args) {
         calls.push(create_attribute_changed_callback_log(this, ...args));
     }
     CustomElement.observedAttributes = ['title'];
     customElements.define('parser-created-element', CustomElement);
     assert_attribute_log_entry(calls[0], {name: 'title', oldValue: null, newValue: '', namespace: null});
 }, 'Upgrading a parser created element must enqueue and invoke attributeChangedCallback for an HTML attribute');

 test(function () {
     var calls = [];
     class CustomElement extends HTMLElement { }
     CustomElement.prototype.attributeChangedCallback = function (...args) {
         calls.push(create_attribute_changed_callback_log(this, ...args));
     }
     CustomElement.observedAttributes = ['title'];
     customElements.define('cloned-element-with-attribute', CustomElement);

     var instance = document.createElement('cloned-element-with-attribute');
     assert_equals(calls.length, 0);
     instance.title = '';
     assert_attribute_log_entry(calls[0], {name: 'title', oldValue: null, newValue: '', namespace: null});

     calls = [];
     var clone = instance.cloneNode(false);
     assert_attribute_log_entry(calls[0], {name: 'title', oldValue: null, newValue: '', namespace: null});
 }, 'Upgrading a cloned element must enqueue and invoke attributeChangedCallback for an HTML attribute');

 </script>
 </body>
 </html>
	<!DOCTYPE html>
	<html>
	<head>
	<title>Custom Elements: attributeChangedCallback</title>
	<meta name="author" title="Ryosuke Niwa" href="mailto:rniwa@webkit.org">
	<meta name="assert" content="attributeChangedCallback must be enqueued whenever custom element's attribute is added, changed or removed">
	<link rel="help" href="https://w3c.github.io/webcomponents/spec/custom/#dfn-attribute-changed-callback">
	<script src="/resources/testharness.js"></script>
	<script src="/resources/testharnessreport.js"></script>
	<script src="resources/custom-elements-helpers.js"></script>
	</head>
	<body>
	<div id="log"></div>
	<parser-created-element title></parser-created-element>
	<script>

	var customElement = define_new_custom_element(['title', 'id', 'r']);

	test(function () {
	const instance = document.createElement(customElement.name);
	assert_array_equals(customElement.takeLog().types(), ['constructed']);

	instance.setAttribute('title', 'foo');
	assert_equals(instance.getAttribute('title'), 'foo');
	var logEntries = customElement.takeLog();
	assert_array_equals(logEntries.types(), ['attributeChanged']);
	assert_attribute_log_entry(logEntries.last(), {name: 'title', oldValue: null, newValue: 'foo', namespace: null});

	instance.removeAttribute('title');
	assert_equals(instance.getAttribute('title'), null);
	var logEntries = customElement.takeLog();
	assert_array_equals(logEntries.types(), ['attributeChanged']);
	assert_attribute_log_entry(logEntries.last(), {name: 'title', oldValue: 'foo', newValue: null, namespace: null});
	}, 'setAttribute and removeAttribute must enqueue and invoke attributeChangedCallback');

	test(function () {
	var instance = document.createElement(customElement.name);
	assert_array_equals(customElement.takeLog().types(), ['constructed']);

	instance.setAttributeNS('http://www.w3.org/2000/svg', 'title', 'hello');
	assert_equals(instance.getAttribute('title'), 'hello');
	var logEntries = customElement.takeLog();
	assert_array_equals(logEntries.types(), ['attributeChanged']);
	assert_attribute_log_entry(logEntries.last(), {name: 'title', oldValue: null, newValue: 'hello', namespace: 'http://www.w3.org/2000/svg'});

	instance.removeAttributeNS('http://www.w3.org/2000/svg', 'title');
	assert_equals(instance.getAttribute('title'), null);
	var logEntries = customElement.takeLog();
	assert_array_equals(logEntries.types(), ['attributeChanged']);
	assert_attribute_log_entry(logEntries.last(), {name: 'title', oldValue: 'hello', newValue: null, namespace: 'http://www.w3.org/2000/svg'});
	}, 'setAttributeNS and removeAttributeNS must enqueue and invoke attributeChangedCallback');

	test(function () {
	var instance = document.createElement(customElement.name);
	assert_array_equals(customElement.takeLog().types(), ['constructed']);

	var attr = document.createAttribute('id');
	attr.value = 'bar';
	instance.setAttributeNode(attr);

	assert_equals(instance.getAttribute('id'), 'bar');
	var logEntries = customElement.takeLog();
	assert_array_equals(logEntries.types(), ['attributeChanged']);
	assert_attribute_log_entry(logEntries.last(), {name: 'id', oldValue: null, newValue: 'bar', namespace: null});

	instance.removeAttributeNode(attr);
	assert_equals(instance.getAttribute('id'), null);
	var logEntries = customElement.takeLog();
	assert_array_equals(logEntries.types(), ['attributeChanged']);
	assert_attribute_log_entry(logEntries.last(), {name: 'id', oldValue: 'bar', newValue: null, namespace: null});
	}, 'setAttributeNode and removeAttributeNode must enqueue and invoke attributeChangedCallback for an HTML attribute');

	test(function () {
	const instance = document.createElement(customElement.name);
	assert_array_equals(customElement.takeLog().types(), ['constructed']);

	const attr = document.createAttributeNS('http://www.w3.org/2000/svg', 'r');
	attr.value = '100';
	instance.setAttributeNode(attr);

	assert_equals(instance.getAttribute('r'), '100');
	var logEntries = customElement.takeLog();
	assert_array_equals(logEntries.types(), ['attributeChanged']);
	assert_attribute_log_entry(logEntries.last(), {name: 'r', oldValue: null, newValue: '100', namespace: 'http://www.w3.org/2000/svg'});

	instance.removeAttributeNode(attr);
	assert_equals(instance.getAttribute('r'), null);
	var logEntries = customElement.takeLog();
	assert_array_equals(logEntries.types(), ['attributeChanged']);
	assert_attribute_log_entry(logEntries.last(), {name: 'r', oldValue: '100', newValue: null, namespace: 'http://www.w3.org/2000/svg'});
	}, 'setAttributeNode and removeAttributeNS must enqueue and invoke attributeChangedCallback for an SVG attribute');

	test(function () {
	const instance = document.createElement(customElement.name);
	assert_array_equals(customElement.takeLog().types(), ['constructed']);

	instance.toggleAttribute('title', true);
	assert_equals(instance.hasAttribute('title'), true);
	var logEntries = customElement.takeLog();
	assert_array_equals(logEntries.types(), ['attributeChanged']);
	assert_attribute_log_entry(logEntries.last(), {name: 'title', oldValue: null, newValue: '', namespace: null});

	instance.toggleAttribute('title');
	assert_equals(instance.hasAttribute('title'), false);
	var logEntries = customElement.takeLog();
	assert_array_equals(logEntries.types(), ['attributeChanged']);
	assert_attribute_log_entry(logEntries.last(), {name: 'title', oldValue: '', newValue: null, namespace: null});
	}, 'toggleAttribute must enqueue and invoke attributeChangedCallback');

	test(function () {
	const callsToOld = [];
	const callsToNew = [];
	class CustomElement extends HTMLElement { }
	CustomElement.prototype.attributeChangedCallback = function (...args) {
	callsToOld.push(create_attribute_changed_callback_log(this, ...args));
	}
	CustomElement.observedAttributes = ['title'];
	customElements.define('element-with-mutated-attribute-changed-callback', CustomElement);
	CustomElement.prototype.attributeChangedCallback = function (...args) {
	callsToNew.push(create_attribute_changed_callback_log(this, ...args));
	}

	const instance = document.createElement('element-with-mutated-attribute-changed-callback');
	instance.setAttribute('title', 'hi');
	assert_equals(instance.getAttribute('title'), 'hi');
	assert_array_equals(callsToNew, []);
	assert_equals(callsToOld.length, 1);
	assert_attribute_log_entry(callsToOld[0], {name: 'title', oldValue: null, newValue: 'hi', namespace: null});
	}, 'Mutating attributeChangedCallback after calling customElements.define must not affect the callback being invoked');

	test(function () {
	const calls = [];
	class CustomElement extends HTMLElement {
	attributeChangedCallback(...args) {
	calls.push(create_attribute_changed_callback_log(this, ...args));
	}
	}
	CustomElement.observedAttributes = ['title'];
	customElements.define('element-not-observing-id-attribute', CustomElement);

	const instance = document.createElement('element-not-observing-id-attribute');
	assert_equals(calls.length, 0);
	instance.setAttribute('title', 'hi');
	assert_equals(calls.length, 1);
	assert_attribute_log_entry(calls[0], {name: 'title', oldValue: null, newValue: 'hi', namespace: null});
	instance.setAttribute('id', 'some');
	assert_equals(calls.length, 1);
	assert_attribute_log_entry(calls[0], {name: 'title', oldValue: null, newValue: 'hi', namespace: null});
	}, 'attributedChangedCallback must not be invoked when the observed attributes does not contain the attribute');

	test(function () {
	const calls = [];
	class CustomElement extends HTMLElement { }
	CustomElement.prototype.attributeChangedCallback = function (...args) {
	calls.push(create_attribute_changed_callback_log(this, ...args));
	}
	CustomElement.observedAttributes = ['title', 'lang'];
	customElements.define('element-with-mutated-observed-attributes', CustomElement);
	CustomElement.observedAttributes = ['title', 'id'];

	const instance = document.createElement('element-with-mutated-observed-attributes');
	instance.setAttribute('title', 'hi');
	assert_equals(calls.length, 1);
	assert_attribute_log_entry(calls[0], {name: 'title', oldValue: null, newValue: 'hi', namespace: null});

	instance.setAttribute('id', 'some');
	assert_equals(calls.length, 1);

	instance.setAttribute('lang', 'en');
	assert_equals(calls.length, 2);
	assert_attribute_log_entry(calls[1], {name: 'lang', oldValue: null, newValue: 'en', namespace: null});
	}, 'Mutating observedAttributes after calling customElements.define must not affect the set of attributes for which attributedChangedCallback is invoked');

	test(function () {
	var calls = [];
	class CustomElement extends HTMLElement { }
	CustomElement.prototype.attributeChangedCallback = function (...args) {
	calls.push(create_attribute_changed_callback_log(this, ...args));
	}
	CustomElement.observedAttributes = { [Symbol.iterator]: function *() { yield 'lang'; yield 'style'; } };
	customElements.define('element-with-generator-observed-attributes', CustomElement);

	var instance = document.createElement('element-with-generator-observed-attributes');
	instance.setAttribute('lang', 'en');
	assert_equals(calls.length, 1);
	assert_attribute_log_entry(calls[0], {name: 'lang', oldValue: null, newValue: 'en', namespace: null});

	instance.setAttribute('lang', 'ja');
	assert_equals(calls.length, 2);
	assert_attribute_log_entry(calls[1], {name: 'lang', oldValue: 'en', newValue: 'ja', namespace: null});

	instance.setAttribute('title', 'hello');
	assert_equals(calls.length, 2);

	instance.setAttribute('style', 'font-size: 2rem');
	assert_equals(calls.length, 3);
	assert_attribute_log_entry(calls[2], {name: 'style', oldValue: null, newValue: 'font-size: 2rem', namespace: null});
	}, 'attributedChangedCallback must be enqueued for attributes specified in a non-Array iterable observedAttributes');

	test(function () {
	var calls = [];
	class CustomElement extends HTMLElement { }
	CustomElement.prototype.attributeChangedCallback = function (...args) {
	calls.push(create_attribute_changed_callback_log(this, ...args));
	}
	CustomElement.observedAttributes = ['style'];
	customElements.define('element-with-style-attribute-observation', CustomElement);

	var instance = document.createElement('element-with-style-attribute-observation');
	assert_equals(calls.length, 0);

	instance.style.fontSize = '10px';
	assert_equals(calls.length, 1);
	assert_attribute_log_entry(calls[0], {name: 'style', oldValue: null, newValue: 'font-size: 10px;', namespace: null});

	instance.style.fontSize = '20px';
	assert_equals(calls.length, 2);
	assert_attribute_log_entry(calls[1], {name: 'style', oldValue: 'font-size: 10px;', newValue: 'font-size: 20px;', namespace: null});

	}, 'attributedChangedCallback must be enqueued for style attribute change by mutating inline style declaration');

	test(function () {
	var calls = [];
	class CustomElement extends HTMLElement { }
	CustomElement.prototype.attributeChangedCallback = function (...args) {
	calls.push(create_attribute_changed_callback_log(this, ...args));
	}
	CustomElement.observedAttributes = ['title'];
	customElements.define('element-with-no-style-attribute-observation', CustomElement);

	var instance = document.createElement('element-with-no-style-attribute-observation');
	assert_equals(calls.length, 0);
	instance.style.fontSize = '10px';
	assert_equals(calls.length, 0);
	instance.title = 'hello';
	assert_attribute_log_entry(calls[0], {name: 'title', oldValue: null, newValue: 'hello', namespace: null});
	}, 'attributedChangedCallback must not be enqueued when mutating inline style declaration if the style attribute is not observed');

	test(function () {
	var calls = [];
	class CustomElement extends HTMLElement { }
	CustomElement.prototype.attributeChangedCallback = function (...args) {
	calls.push(create_attribute_changed_callback_log(this, ...args));
	}
	CustomElement.observedAttributes = ['title'];
	customElements.define('parser-created-element', CustomElement);
	assert_attribute_log_entry(calls[0], {name: 'title', oldValue: null, newValue: '', namespace: null});
	}, 'Upgrading a parser created element must enqueue and invoke attributeChangedCallback for an HTML attribute');

	test(function () {
	var calls = [];
	class CustomElement extends HTMLElement { }
	CustomElement.prototype.attributeChangedCallback = function (...args) {
	calls.push(create_attribute_changed_callback_log(this, ...args));
	}
	CustomElement.observedAttributes = ['title'];
	customElements.define('cloned-element-with-attribute', CustomElement);

	var instance = document.createElement('cloned-element-with-attribute');
	assert_equals(calls.length, 0);
	instance.title = '';
	assert_attribute_log_entry(calls[0], {name: 'title', oldValue: null, newValue: '', namespace: null});

	calls = [];
	var clone = instance.cloneNode(false);
	assert_attribute_log_entry(calls[0], {name: 'title', oldValue: null, newValue: '', namespace: null});
	}, 'Upgrading a cloned element must enqueue and invoke attributeChangedCallback for an HTML attribute');

	</script>
	</body>
	</html>