36 lines
1.6 KiB
JavaScript
36 lines
1.6 KiB
JavaScript
'use strict';
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/**
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* @license
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* Copyright (c) 2016 The Polymer Project Authors. All rights reserved.
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* This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
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* The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
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* The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
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* Code distributed by Google as part of the polymer project is also
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* subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
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*/
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/**
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* This shim allows elements written in, or compiled to, ES5 to work on native
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* implementations of Custom Elements v1. It sets new.target to the value of
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* this.constructor so that the native HTMLElement constructor can access the
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* current under-construction element's definition.
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*/
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(function () {
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if (
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// No Reflect, no classes, no need for shim because native custom elements
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// require ES2015 classes or Reflect.
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window.Reflect === undefined || window.customElements === undefined ||
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// The webcomponentsjs custom elements polyfill doesn't require
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// ES2015-compatible construction (`super()` or `Reflect.construct`).
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window.customElements.hasOwnProperty('polyfillWrapFlushCallback')) {
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return;
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}
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var BuiltInHTMLElement = HTMLElement;
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window.HTMLElement = function HTMLElement() {
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return Reflect.construct(BuiltInHTMLElement, [], this.constructor);
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};
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HTMLElement.prototype = BuiltInHTMLElement.prototype;
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HTMLElement.prototype.constructor = HTMLElement;
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Object.setPrototypeOf(HTMLElement, BuiltInHTMLElement);
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})(); |