The most popular HTML, CSS, and JavaScript framework for developing responsive, mobile first projects on the web.
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Updated
Nov 9, 2026 - MDX
CSS Frameworks offer one or multiple stylesheets from basic styling to generic components to some extent, including but not limited to
They often have their own class notation and many use preprocessors like Sass, Less or Stylus.
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The most popular HTML, CSS, and JavaScript framework for developing responsive, mobile first projects on the web.