| <!DOCTYPE html> |
| <html> |
| <head> |
| <title>Custom Elements: Changes to the HTML parser</title> |
| <meta name="author" title="Ryosuke Niwa" href="mailto:rniwa@webkit.org"> |
| <meta name="assert" content="HTML parser must construct a custom element synchronously"> |
| <link rel="help" href="https://html.spec.whatwg.org/#create-an-element-for-the-token"> |
| <link rel="help" href="https://dom.spec.whatwg.org/#concept-create-element"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| </head> |
| <body> |
| <div id="log"></div> |
| <script> |
| |
| var childElementCountInConstructor; |
| var containerChildNodesInConstructor = []; |
| var containerNextSiblingInConstructor; |
| class MyCustomElement extends HTMLElement { |
| constructor() { |
| super(); |
| var container = document.getElementById('custom-element-container'); |
| for (var i = 0; i < container.childNodes.length; i++) |
| containerChildNodesInConstructor.push(container.childNodes[i]); |
| containerNextSiblingInConstructor = container.nextSibling; |
| } |
| }; |
| customElements.define('my-custom-element', MyCustomElement); |
| |
| </script> |
| <div id="custom-element-container"> |
| <span id="custom-element-previous-element"></span> |
| <my-custom-element></my-custom-element> |
| <div id="custom-element-next-element"></div> |
| </div> |
| <script> |
| |
| test(function () { |
| var instance = document.querySelector('my-custom-element'); |
| |
| assert_equals(containerChildNodesInConstructor.length, 3); |
| assert_equals(containerChildNodesInConstructor[0], instance.parentNode.firstChild); |
| assert_equals(containerChildNodesInConstructor[1], document.getElementById('custom-element-previous-element')); |
| assert_equals(containerChildNodesInConstructor[2], instance.previousSibling); |
| assert_equals(containerNextSiblingInConstructor, null); |
| |
| }, 'HTML parser must only append nodes that appear before a custom element before instantiating the custom element'); |
| |
| </script> |
| </body> |
| </html> |