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{{Short description|Coding technique}}
{{Use dmy dates|date=December 2021}}
A '''CSS hack''' is a [[Computer programming|coding]] technique used to hide or show [[Cascading Style Sheets|CSS]] [[Markup language|markup]] depending on the [[Web browser|browser]], version number, or capabilities. Browsers have different interpretations of CSS behavior and different levels of support for the [[W3C]] [[World Wide Web Consortium#Standards|standards]]. CSS hacks are sometimes used to achieve consistent layout appearance in multiple browsers that do not have compatible rendering. Most of these hacks do not work in modern versions of the browsers, and other techniques, such as feature support detection, have become more prevalent.
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=== Conditional comments ===
Prior to version 10, [[Internet Explorer]] supported a special comment syntax that would allow blocks of HTML to be read only by specific versions of the browser. These comments are mostly used to provide specific CSS and JavaScript workarounds to older versions of the browser. No other browsers interpreted these comments or offered similar functionality.
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=== Script polyfills ===
While JavaScript feature detection and <syntaxhighlight lang="CSS" inline>@supports</syntaxhighlight> rules can help to target browsers that require fallback functionality, they will not address bugs in specific browsers or enable that advanced functionality. [[Polyfill (programming)|Polyfills]], scripts that make behavior consistent across all browsers, can be used to add support for new CSS rules (for example, [[media queries]] in IE 8) as well as fix bugs in specific browsers. Since polyfills add or fix functionality in browsers that do not have it, they serve a different purpose than feature queries, but can be used in combination with them.
==References==
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