static/scss/bootstrap-4.0.0-alpha.6/grunt/postcss.js

   1 module.exports = {
   2   use: [
   3     'postcss-flexbugs-fixes',
   4     'autoprefixer'
   5   ],
   6   map: {
   7     inline: false,
   8     annotation: true,
   9     sourcesContent: true
  10   },
  11   autoprefixer: {
  12     browsers: [
  13       //
  14       // Official browser support policy:
  15       // https://v4-alpha.getbootstrap.com/getting-started/browsers-devices/#supported-browsers
  16       //
  17       'Chrome >= 35', // Exact version number here is kinda arbitrary
  18       // Rather than using Autoprefixer's native "Firefox ESR" version specifier string,
  19       // we deliberately hardcode the number. This is to avoid unwittingly severely breaking the previous ESR in the event that:
  20       // (a) we happen to ship a new Bootstrap release soon after the release of a new ESR,
  21       //     such that folks haven't yet had a reasonable amount of time to upgrade; and
  22       // (b) the new ESR has unprefixed CSS properties/values whose absence would severely break webpages
  23       //     (e.g. `box-sizing`, as opposed to `background: linear-gradient(...)`).
  24       //     Since they've been unprefixed, Autoprefixer will stop prefixing them,
  25       //     thus causing them to not work in the previous ESR (where the prefixes were required).
  26       'Firefox >= 38', // Current Firefox Extended Support Release (ESR); https://www.mozilla.org/en-US/firefox/organizations/faq/
  27       // Note: Edge versions in Autoprefixer & Can I Use refer to the EdgeHTML rendering engine version,
  28       // NOT the Edge app version shown in Edge's "About" screen.
  29       // For example, at the time of writing, Edge 20 on an up-to-date system uses EdgeHTML 12.
  30       // See also https://github.com/Fyrd/caniuse/issues/1928
  31       'Edge >= 12',
  32       'Explorer >= 10',
  33       // Out of leniency, we prefix these 1 version further back than the official policy.
  34       'iOS >= 8',
  35       'Safari >= 8',
  36       // The following remain NOT officially supported, but we're lenient and include their prefixes to avoid severely breaking in them.
  37       'Android 2.3',
  38       'Android >= 4',
  39       'Opera >= 12'
  40     ]
  41   }
  42 }