9.6 “Nunc id vides, nunc ne vides”

Autoprefixer 9.6 marked browsers option as deprecated and added text-orientation and @media (min-resolution: 2x) support.

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Browsers

Autoprefixer adds prefixes only for target browsers, browsers which is support on your project.

Initially, Autoprefixer had the browsers option to set target browsers. But we found that many tools need target browsers too. postcss-preset-env and babel-preset-env use them to add only actual polyfills, postcss-normalize uses them to add only necessary CSS reset rules, plugins for ESLint and Stylelint will warn you if some of the target browsers doesn’t support your code.

This is why we created Browserslist config file. It is a single config for all tools.

A lot of users still uses the browsers option. We understand them; it is hard to change old practice. Unfortunately, using the browsers option creates many problems. For instance, you can miss that your build tool has own Autoprefixer inside. It will cut your prefixes because it will not know about your target browsers.

This is why, in 9.6, we decided to deprecate the browsers option. Autoprefixer will show a warning on this option. In the next 10.0 release, we will drop this option. This is how you can migrate:

1. Create browserslist key with an array in package.json.

2. Copy queries from the browsers option. If you have browsers: [“last 1 version”, “not dead”], then you need:

      "browserslist": [
        "last 1 version",
        "not dead"
      ]

HiDPI Media Query

We all need to support HiDPI/retina screen now. Autoprefixer supports specific media query for HiDPI screens:

.image {
  background-image: url(image@1x.png);
}
@media (min-resolution: 2dppx) {
  .image {
    background-image: url(image@2x.png);
  }
}

.image {
  background-image: url(image@1x.png);
}
@media (-webkit-min-device-pixel-ratio: 2),
       (-o-min-device-pixel-ratio: 2/1),
       (min-resolution: 2dppx) {
  .image {
    background-image: url(image@2x.png);
  }
}

Bug we found that CSS Values 4 spec added x alias for dppx.

Autoprefixer 9.6 supports @media (min-resolution: 2x) shortcut. Note, that Autoprefixer will not convert it to 2dppx. Autoprefixer adds only prefixes. Use postcss-preset-env to add polyfills.

Other

• text-orientation property support was added.
• @jmmarco added CONTRIBUTING.md