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Parse CSS and add vendor prefixes to CSS rules using values from Can I Use.
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Autoprefixer for .NET

This is a .NET adaptation of Autoprefixer, a great Javascript library by Andrey Sitnik.

Parse CSS and add vendor prefixes to CSS rules using values from Can I Use.

Write your CSS rules without vendor prefixes (in fact, forget about them entirely):

:fullscreen a {
    transition: transform 1s

Process your CSS by Autoprefixer:

using (var autoprefixer = new Autoprefixer.Compiler(() => new V8JsEngine()) {
    var prefixed = autoprefixer.Prefix(css, 
       new BrowserSpecification()
            .BrowserVersionGreaterThan(Browsers.Explorer, 7)

It will use the data on current browser popularity and properties support to apply prefixes for you:

:-webkit-full-screen a {
    -webkit-transition: -webkit-transform 1s;
    transition: transform 1s
:-moz-full-screen a {
    transition: transform 1s
:-ms-fullscreen a {
    transition: transform 1s
:fullscreen a {
    -webkit-transition: -webkit-transform 1s;
    transition: transform 1s


You can use it independently, or with BundleTransformer.

Autoprefixer is installed via Nuget.

Independent installation

> Install-Package Autoprefixer

Everything you need is in the Autoprefixer namespace (see example above). You'll also need to pick a Javascript engine to use, we recommend the JavaScriptEngineSwitcher.V8 Nuget package.


Install-Package BundleTransformer.Autoprefixer.Unofficial

This is an unofficial translator for BundleTransformer. To configure it, make the following changes to your web.config (assuming you already have BundleTransformer set up correctly):

    <sectionGroup name="bundleTransformer">
      <section name="core" type="BundleTransformer.Core.Configuration.CoreSettings, BundleTransformer.Core"/>
      <!-- add this line: -->
      <section name="autoprefixer" type="BundleTransformer.Autoprefixer.Configuration.AutoprefixerSettings, BundleTransformer.Autoprefixer"/>
    <sectionGroup name="jsEngineSwitcher">
      <!-- you probably have this -->
      <section name="core" type="JavaScriptEngineSwitcher.Core.Configuration.CoreConfiguration, JavaScriptEngineSwitcher.Core"/>

  <bundleTransformer xmlns="">
          <!-- add this line AFTER any other translators: -->
          <add name="AutoprefixerTranslator" type="BundleTransformer.Autoprefixer.Translators.AutoprefixerTranslator, BundleTransformer.Autoprefixer" enabled="true"/>
    <autoprefixer cascade="true">
      <!-- pick your javascript engine -->
      <jsEngine name="V8JsEngine"/> 
        <!-- write definitions from -->
        <add definition="last 3 version"/>

Visual cascade

cascade determines if you want a visual cascade of vendor-prefixes:

a {
    -webkit-box-sizing: border-box;
       -moz-box-sizing: border-box;
            box-sizing: border-box
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