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