parser-sets-attributes-and-children.html (4993B)
1 <!DOCTYPE html> 2 <html> 3 <head> 4 <title>Custom Elements: Changes to the HTML parser</title> 5 <meta name="author" title="Ryosuke Niwa" href="mailto:rniwa@webkit.org"> 6 <meta name="assert" content="HTML parser must set the attributes and append the children on a custom element"> 7 <link rel="help" href="https://html.spec.whatwg.org/#create-an-element-for-the-token"> 8 <link rel="help" href="https://html.spec.whatwg.org/multipage/parsing.html#insert-a-foreign-element"> 9 <link rel="help" href="https://dom.spec.whatwg.org/#concept-create-element"> 10 <script src="/resources/testharness.js"></script> 11 <script src="/resources/testharnessreport.js"></script> 12 <script src="../resources/custom-elements-helpers.js"></script> 13 </head> 14 <body> 15 <div id="log"></div> 16 <script> 17 18 var numberOfAttributesInConstructor = 0; 19 var numberOfChildNodesInConstructor = 0; 20 var numberOfChildNodesInAttributeChangedCallback = 0; 21 var numberOfChildNodesInConnectedCallback = 0; 22 var attributesChangedCalls = []; 23 24 class MyCustomElement extends HTMLElement { 25 constructor(...args) { 26 super(...args); 27 numberOfAttributesInConstructor = this.attributes.length; 28 numberOfChildNodesInConstructor = this.childNodes.length; 29 } 30 31 attributeChangedCallback(...args) { 32 attributesChangedCalls.push(create_attribute_changed_callback_log(this, ...args)); 33 numberOfChildNodesInAttributeChangedCallback = this.childNodes.length; 34 } 35 36 static get observedAttributes() { 37 return ['id', 'class']; 38 } 39 40 connectedCallback() { 41 numberOfChildNodesInConnectedCallback = this.childNodes.length; 42 } 43 }; 44 customElements.define('my-custom-element', MyCustomElement); 45 46 </script> 47 <my-custom-element id="custom-element-id" class="class1 class2">hello <b>world</b></my-custom-element> 48 <script> 49 50 var customElement = document.querySelector('my-custom-element'); 51 52 test(function () { 53 assert_equals(customElement.getAttribute('id'), 'custom-element-id', 'HTML parser must preserve the id attribute'); 54 assert_equals(customElement.id, 'custom-element-id', 'HTML parser must preserve the semantics of reflect for the id attribute'); 55 assert_equals(customElement.getAttribute('class'), 'class1 class2', 'HTML parser must preserve the class attribute'); 56 assert_equals(customElement.classList.length, 2, 'HTML parser must initialize classList on custom elements'); 57 assert_equals(customElement.classList[0], 'class1', 'HTML parser must initialize classList on custom elements'); 58 assert_equals(customElement.classList[1], 'class2', 'HTML parser must initialize classList on custom elements'); 59 }, 'HTML parser must set the attributes'); 60 61 test(function () { 62 assert_equals(customElement.childNodes.length, 2, 'HTML parser must append child nodes'); 63 assert_true(customElement.firstChild instanceof Text, 'HTML parser must append Text node child to a custom element'); 64 assert_equals(customElement.firstChild.data, 'hello ', 'HTML parser must append Text node child to a custom element'); 65 assert_true(customElement.lastChild instanceof HTMLElement, 'HTML parser must append a builtin element child to a custom element'); 66 assert_true(customElement.lastChild.firstChild instanceof Text, 'HTML parser must preserve grandchild nodes of a custom element'); 67 assert_equals(customElement.lastChild.firstChild.data, 'world', 'HTML parser must preserve grandchild nodes of a custom element'); 68 }, 'HTML parser must append child nodes'); 69 70 test(function () { 71 assert_equals(numberOfAttributesInConstructor, 0, 'HTML parser must not set attributes on a custom element before invoking the constructor'); 72 assert_equals(numberOfChildNodesInConstructor, 0, 'HTML parser must not append child nodes to a custom element before invoking the constructor'); 73 }, 'HTML parser must set the attributes or append children before calling constructor'); 74 75 test(function () { 76 // https://html.spec.whatwg.org/multipage/parsing.html#insert-a-foreign-element 77 // 3.3. Pop the element queue from the custom element reactions 78 // stack, and invoke custom element reactions in that queue. 79 assert_equals(numberOfChildNodesInConnectedCallback, 0); 80 }, 'HTML parser should call connectedCallback before appending child nodes.'); 81 82 test(function () { 83 assert_equals(attributesChangedCalls.length, 2); 84 assert_attribute_log_entry(attributesChangedCalls[0], {name: 'id', oldValue: null, newValue: 'custom-element-id', namespace: null}); 85 assert_attribute_log_entry(attributesChangedCalls[1], {name: 'class', oldValue: null, newValue: 'class1 class2', namespace: null}); 86 // https://html.spec.whatwg.org/multipage/parsing.html#create-an-element-for-the-token 87 // 9.2. Invoke custom element reactions in queue. 88 assert_equals(numberOfChildNodesInAttributeChangedCallback, 0, 89 'attributeChangedCallback should be called ' + 90 'before appending a child'); 91 }, 'HTML parser must enqueue attributeChanged reactions'); 92 93 </script> 94 </body> 95 </html>