| /** |
| * @license |
| * Copyright Google LLC 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 |
| */ |
| let shadowDomIsSupported; |
| /** Checks whether the user's browser support Shadow DOM. */ |
| export function _supportsShadowDom() { |
| if (shadowDomIsSupported == null) { |
| const head = typeof document !== 'undefined' ? document.head : null; |
| shadowDomIsSupported = !!(head && (head.createShadowRoot || head.attachShadow)); |
| } |
| return shadowDomIsSupported; |
| } |
| /** Gets the shadow root of an element, if supported and the element is inside the Shadow DOM. */ |
| export function _getShadowRoot(element) { |
| if (_supportsShadowDom()) { |
| const rootNode = element.getRootNode ? element.getRootNode() : null; |
| // Note that this should be caught by `_supportsShadowDom`, but some |
| // teams have been able to hit this code path on unsupported browsers. |
| if (typeof ShadowRoot !== 'undefined' && ShadowRoot && rootNode instanceof ShadowRoot) { |
| return rootNode; |
| } |
| } |
| return null; |
| } |
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