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A simple feature test to detect pseudo selector support. Via Paul Irish and Diego Perini: https://gist.github.com/paulirish/441842
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| /** | |
| * Test for pseudo-selector support | |
| * @author Paul Irish | |
| * @link https://gist.github.com/paulirish/441842 | |
| * @param {String} selector Pseudo-selector to test | |
| * @return {Boolean} | |
| */ | |
| function selectorSupported(selector){ | |
| var support, link, sheet, doc = document, | |
| root = doc.documentElement, | |
| head = root.getElementsByTagName('head')[0], | |
| impl = doc.implementation || { | |
| hasFeature: function() { | |
| return false; | |
| } | |
| }, | |
| link = doc.createElement("style"); | |
| link.type = 'text/css'; | |
| (head || root).insertBefore(link, (head || root).firstChild); | |
| sheet = link.sheet || link.styleSheet; | |
| if (!(sheet && selector)) return false; | |
| support = impl.hasFeature('CSS2', '') ? | |
| function(selector) { | |
| try { | |
| sheet.insertRule(selector + '{ }', 0); | |
| sheet.deleteRule(sheet.cssRules.length - 1); | |
| } catch (e) { | |
| return false; | |
| } | |
| return true; | |
| } : function(selector) { | |
| sheet.cssText = selector + ' { }'; | |
| return sheet.cssText.length !== 0 && !(/unknown/i).test(sheet.cssText) && sheet.cssText.indexOf(selector) === 0; | |
| }; | |
| return support(selector); | |
| }; | |
| // Example: If ':before' supported, add '.pseudo-selectors' class to the <html> element | |
| // if (selectorSupported(':before')) { | |
| // document.documentElement.className += 'pseudo-selectors'; | |
| // } |
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