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    <p>Found a better solution, which <strong>works across all browsers.</strong><br> Uses document.styleSheet to add or replace rules. Accepted answer is short and handy but this works across IE8 and less too. </p> <pre><code>function createCSSSelector (selector, style) { if (!document.styleSheets) return; if (document.getElementsByTagName('head').length == 0) return; var styleSheet,mediaType; if (document.styleSheets.length &gt; 0) { for (var i = 0, l = document.styleSheets.length; i &lt; l; i++) { if (document.styleSheets[i].disabled) continue; var media = document.styleSheets[i].media; mediaType = typeof media; if (mediaType === 'string') { if (media === '' || (media.indexOf('screen') !== -1)) { styleSheet = document.styleSheets[i]; } } else if (mediaType=='object') { if (media.mediaText === '' || (media.mediaText.indexOf('screen') !== -1)) { styleSheet = document.styleSheets[i]; } } if (typeof styleSheet !== 'undefined') break; } } if (typeof styleSheet === 'undefined') { var styleSheetElement = document.createElement('style'); styleSheetElement.type = 'text/css'; document.getElementsByTagName('head')[0].appendChild(styleSheetElement); for (i = 0; i &lt; document.styleSheets.length; i++) { if (document.styleSheets[i].disabled) { continue; } styleSheet = document.styleSheets[i]; } mediaType = typeof styleSheet.media; } if (mediaType === 'string') { for (var i = 0, l = styleSheet.rules.length; i &lt; l; i++) { if(styleSheet.rules[i].selectorText &amp;&amp; styleSheet.rules[i].selectorText.toLowerCase()==selector.toLowerCase()) { styleSheet.rules[i].style.cssText = style; return; } } styleSheet.addRule(selector,style); } else if (mediaType === 'object') { var styleSheetLength = (styleSheet.cssRules) ? styleSheet.cssRules.length : 0; for (var i = 0; i &lt; styleSheetLength; i++) { if (styleSheet.cssRules[i].selectorText &amp;&amp; styleSheet.cssRules[i].selectorText.toLowerCase() == selector.toLowerCase()) { styleSheet.cssRules[i].style.cssText = style; return; } } styleSheet.insertRule(selector + '{' + style + '}', styleSheetLength); } } </code></pre> <p>Function is used as follows. </p> <pre><code>createCSSSelector('.mycssclass', 'display:none'); </code></pre> <p>Note that even though function name is createClass it actually creates a selector. So dont forget to add .(period) before your class name. No need to mention that you can create other selectors too with this function. </p>
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    1. POHow to dynamically create CSS class in JavaScript and apply?
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    1. USVishwanath
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      1. VTUpMod
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    1. COConfirmed working with IE8. I did have to add a "styleSheet.cssRules[i].selectorText &&" and "styleSheet.rules[i].selectorText &&"in the mediaType for-loop ifs because it didn't work in Chrome, apparently sometimes the selectorText isn't defined.
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    2. CO@w00t Could you please paste or edit the code to make it work?
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    3. CO@Hengjie edited, needs to be peer-reviewed now.
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