95 lines
2.8 KiB
JavaScript
95 lines
2.8 KiB
JavaScript
/**
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* @license
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* Copyright The Closure Library Authors.
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* SPDX-License-Identifier: Apache-2.0
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*/
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/**
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* @fileoverview Browser capability checks for the dom package.
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*/
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goog.provide('goog.dom.BrowserFeature');
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goog.require('goog.userAgent');
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/**
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* @define {boolean} Whether we know at compile time that the browser doesn't
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* support OffscreenCanvas.
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*/
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goog.dom.BrowserFeature.ASSUME_NO_OFFSCREEN_CANVAS =
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goog.define('goog.dom.ASSUME_NO_OFFSCREEN_CANVAS', false);
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/**
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* @define {boolean} Whether we know at compile time that the browser supports
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* all OffscreenCanvas contexts.
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*/
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// TODO(user): Eventually this should default to "FEATURESET_YEAR >= 202X".
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goog.dom.BrowserFeature.ASSUME_OFFSCREEN_CANVAS =
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goog.define('goog.dom.ASSUME_OFFSCREEN_CANVAS', false);
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/**
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* Detects if a particular OffscreenCanvas context is supported.
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* @param {string} contextName name of the context to test.
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* @return {boolean} Whether the browser supports this OffscreenCanvas context.
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* @private
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*/
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goog.dom.BrowserFeature.detectOffscreenCanvas_ = function(contextName) {
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'use strict';
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// This code only gets removed because we forced @nosideeffects on
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// the functions. See: b/138802376
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try {
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return Boolean(new self.OffscreenCanvas(0, 0).getContext(contextName));
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} catch (ex) {
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}
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return false;
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};
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/**
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* Whether the browser supports OffscreenCanvas 2D context.
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* @const {boolean}
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*/
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goog.dom.BrowserFeature.OFFSCREEN_CANVAS_2D =
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!goog.dom.BrowserFeature.ASSUME_NO_OFFSCREEN_CANVAS &&
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(goog.dom.BrowserFeature.ASSUME_OFFSCREEN_CANVAS ||
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goog.dom.BrowserFeature.detectOffscreenCanvas_('2d'));
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/**
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* Whether attributes 'name' and 'type' can be added to an element after it's
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* created. False in Internet Explorer prior to version 9.
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* @const {boolean}
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*/
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goog.dom.BrowserFeature.CAN_ADD_NAME_OR_TYPE_ATTRIBUTES = true;
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/**
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* Whether we can use element.children to access an element's Element
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* children. Available since Gecko 1.9.1, IE 9. (IE<9 also includes comment
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* nodes in the collection.)
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* @const {boolean}
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*/
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goog.dom.BrowserFeature.CAN_USE_CHILDREN_ATTRIBUTE = true;
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/**
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* Opera, Safari 3, and Internet Explorer 9 all support innerText but they
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* include text nodes in script and style tags. Not document-mode-dependent.
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* @const {boolean}
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*/
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goog.dom.BrowserFeature.CAN_USE_INNER_TEXT = false;
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/**
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* MSIE, Opera, and Safari>=4 support element.parentElement to access an
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* element's parent if it is an Element.
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* @const {boolean}
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*/
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goog.dom.BrowserFeature.CAN_USE_PARENT_ELEMENT_PROPERTY =
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goog.userAgent.IE || goog.userAgent.WEBKIT;
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/**
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* Whether NoScope elements need a scoped element written before them in
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* innerHTML.
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* MSDN: http://msdn.microsoft.com/en-us/library/ms533897(VS.85).aspx#1
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* @const {boolean}
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*/
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goog.dom.BrowserFeature.INNER_HTML_NEEDS_SCOPED_ELEMENT = goog.userAgent.IE;
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