32 lines
938 B
Plaintext
32 lines
938 B
Plaintext
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/**
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* Copyright (c) 2013-present, Facebook, Inc.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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* @providesModule getDocumentScrollElement
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* @typechecks
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*/
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'use strict';
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const isWebkit = typeof navigator !== 'undefined' && navigator.userAgent.indexOf('AppleWebKit') > -1;
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/**
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* Gets the element with the document scroll properties such as `scrollLeft` and
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* `scrollHeight`. This may differ across different browsers.
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*
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* NOTE: The return value can be null if the DOM is not yet ready.
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*
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* @param {?DOMDocument} doc Defaults to current document.
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* @return {?DOMElement}
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*/
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function getDocumentScrollElement(doc) {
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doc = doc || document;
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if (doc.scrollingElement) {
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return doc.scrollingElement;
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}
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return !isWebkit && doc.compatMode === 'CSS1Compat' ? doc.documentElement : doc.body;
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}
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module.exports = getDocumentScrollElement;
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