cssFx inserts vendor prefixes for CSS3 properties.

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cssFx adds vendor-specific prefixes to your stylesheets.

How it works

When the document has finished loading, internal (<style>) and external (<link>) stylesheets are processed, fetching any @import stylesheets as well. It's recommended to bundle stylesheets into one file to minimize request overhead. Once processing is done, a new <style> tag is appended to the <head> with processed properties. Properties for all vendors (Mozilla, Webkit, Opera, Microsoft) are included by default.


Download cssFx or install it with Bower: bower install cssfx.


Include cssFx in your <head> tag: <script src="cssfx.js"></script>

Make sure any external stylesheets you want processed have the cssfx class.

Browsers Supported

  • Firefox 3+
  • Chrome 1+
  • Internet Explorer 6+
  • Safari 3+
  • Opera 9+

Important Considerations

  • IE and other browsers remove either unknown properties or properties with unknown values. To guarantee that all properties are parsed, link your stylesheet externally.
  • To prevent FOUC (flash of unstyled content), place cssfx.js immediately under the stylesheet tags.
  • cssFx only adds prefixes. It does not polyfill functionality unavailable in the browser.


cssFx is provided under the MIT license.


cssFx is a project by Ivan Malopinsky.