@webcomponents/custom-elements
Version:
HTML Custom Elements Polyfill
66 lines (56 loc) • 1.93 kB
HTML
<html>
<head>
<title>customElements#polyfillWrapFlushCallback</title>
<script>
(window.customElements = window.customElements || {}).forcePolyfill = true;
</script>
<script src="../../../../es6-promise/dist/es6-promise.auto.min.js"></script>
<script src="../../../../web-component-tester/browser.js"></script>
<script src="../../../custom-elements.min.js"></script>
<script>
/**
* @license
* Copyright (c) 2017 The Polymer Project Authors. All rights reserved.
* This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
* The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
* The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
* Code distributed by Google as part of the polymer project is also
* subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
*/
test('Each installed flush callback blocks flushing.', function() {
const element = document.querySelector('custom-element');
const calls = [];
let flushA = undefined;
let flushB = undefined;
customElements.polyfillWrapFlushCallback(function callbackA(flush){
calls.push('callbackA');
flushA = flush;
});
customElements.polyfillWrapFlushCallback(function callbackB(flush){
calls.push('callbackB');
flushB = flush;
});
assert(!element.upgraded);
assert.deepEqual(calls, []);
customElements.define('custom-element', class extends HTMLElement {
constructor() {
super();
this.upgraded = true;
}
});
assert(!element.upgraded);
assert.deepEqual(calls, ['callbackB']);
flushB();
assert(!element.upgraded);
assert.deepEqual(calls, ['callbackB', 'callbackA']);
flushA();
assert(element.upgraded);
assert.deepEqual(calls, ['callbackB', 'callbackA']);
});
</script>
</head>
<body>
<custom-element></custom-element>
</body>
</html>