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/**
       * @license
       * Copyright Google Inc. All Rights Reserved.
       *
       * Use of this source code is governed by an MIT-style license that can be
       * found in the LICENSE file at https://angular.io/license
       *
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       * https://github.com/webcomponents/webcomponentsjs/blob/4efecd7e0e/src/ShadowCSS/ShadowCSS.js
       * https://github.com/angular/angular/blob/master/packages/compiler/src/shadow_css.ts
       */
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