From a358fc9dc1b71c4177735c4ca27c9da350d655af Mon Sep 17 00:00:00 2001
From: Chris Rebert <github@chrisrebert.com>
Date: Mon, 20 Jun 2016 16:18:21 -0700
Subject: [PATCH] Replace grunt-postcss with postcss-cli (#20140)

Refs #19990
Continues the degruntification process.

Also removes mq4-hover-shim for now,
since it doesn't yet implement the standard PostCSS plugin interface.
---
 Gruntfile.js                        |   46 +-
 docs/getting-started/build-tools.md |    2 +-
 grunt/autoprefixer-settings.js      |   31 -
 grunt/npm-shrinkwrap.json           | 1179 ++++++++++++++++++++++++---
 grunt/postcss.js                    |   42 +
 package.json                        |    9 +-
 scss/mixins/_hover.scss             |   19 +-
 7 files changed, 1117 insertions(+), 211 deletions(-)
 delete mode 100644 grunt/autoprefixer-settings.js
 create mode 100644 grunt/postcss.js

diff --git a/Gruntfile.js b/Gruntfile.js
index 1c6415329a..9ba8c7b512 100644
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -19,9 +19,6 @@ module.exports = function (grunt) {
   var fs = require('fs');
   var path = require('path');
   var isTravis = require('is-travis');
-  var mq4HoverShim = require('mq4-hover-shim');
-  var autoprefixerSettings = require('./grunt/autoprefixer-settings.js');
-  var autoprefixer = require('autoprefixer')(autoprefixerSettings);
 
   var configBridge = grunt.file.readJSON('./grunt/configBridge.json', { encoding: 'utf8' });
 
@@ -166,39 +163,6 @@ module.exports = function (grunt) {
       }
     },
 
-    postcss: {
-      core: {
-        options: {
-          map: true,
-          processors: [
-            mq4HoverShim.postprocessorFor({ hoverSelectorPrefix: '.bs-true-hover ' }),
-            require('postcss-flexbugs-fixes')(),
-            autoprefixer
-          ]
-        },
-        src: 'dist/css/*.css'
-      },
-      docs: {
-        options: {
-          processors: [
-            autoprefixer
-          ]
-        },
-        src: 'docs/assets/css/docs.min.css'
-      },
-      examples: {
-        options: {
-          processors: [
-            autoprefixer
-          ]
-        },
-        expand: true,
-        cwd: 'docs/examples/',
-        src: ['**/*.css'],
-        dest: 'docs/examples/'
-      }
-    },
-
     cssmin: {
       options: {
         // TODO: disable `zeroUnits` optimization once clean-css 3.2 is released
@@ -308,6 +272,12 @@ module.exports = function (grunt) {
     },
 
     exec: {
+      postcss: {
+        command: 'npm run postcss'
+      },
+      'postcss-docs': {
+        command: 'npm run postcss-docs'
+      }
     },
 
     buildcontrol: {
@@ -403,7 +373,7 @@ module.exports = function (grunt) {
   // grunt.registerTask('sass-compile', ['sass:core', 'sass:extras', 'sass:docs']);
   grunt.registerTask('sass-compile', ['sass:core', 'sass:docs']);
 
-  grunt.registerTask('dist-css', ['sass-compile', 'postcss:core', 'cssmin:core', 'cssmin:docs']);
+  grunt.registerTask('dist-css', ['sass-compile', 'exec:postcss', 'cssmin:core', 'cssmin:docs']);
 
   // Full distribution task.
   grunt.registerTask('dist', ['clean:dist', 'dist-css', 'dist-js']);
@@ -412,7 +382,7 @@ module.exports = function (grunt) {
   grunt.registerTask('default', ['clean:dist', 'test']);
 
   // Docs task.
-  grunt.registerTask('docs-css', ['postcss:docs', 'postcss:examples', 'cssmin:docs']);
+  grunt.registerTask('docs-css', ['cssmin:docs', 'exec:postcss-docs']);
   grunt.registerTask('lint-docs-css', ['scsslint:docs']);
   grunt.registerTask('docs-js', ['uglify:docsJs']);
   grunt.registerTask('docs', ['lint-docs-css', 'docs-css', 'docs-js', 'clean:docs', 'copy:docs']);
diff --git a/docs/getting-started/build-tools.md b/docs/getting-started/build-tools.md
index c086c036bf..2fe10088b8 100644
--- a/docs/getting-started/build-tools.md
+++ b/docs/getting-started/build-tools.md
@@ -46,7 +46,7 @@ For example, run `TWBS_SASS=sass grunt` to test and build Bootstrap with Ruby Sa
 
 Bootstrap uses [Autoprefixer][autoprefixer] (included in our Gruntfile and build process) to automatically add vendor prefixes to some CSS properties at build time. Doing so saves us time and code by allowing us to write key parts of our CSS a single time while eliminating the need for vendor mixins like those found in v3.
 
-We maintain the list of browsers supported through Autoprefixer in a separate file within our GitHub repository. See [`/grunt/autoprefixer-settings.json`](https://github.com/twbs/bootstrap/blob/master/grunt/autoprefixer-settings.js) for details.
+We maintain the list of browsers supported through Autoprefixer in a separate file within our GitHub repository. See [`/grunt/postcss.js`](https://github.com/twbs/bootstrap/blob/master/grunt/postcss.js) for details.
 
 ## Local documentation
 
diff --git a/grunt/autoprefixer-settings.js b/grunt/autoprefixer-settings.js
deleted file mode 100644
index 6a21726b87..0000000000
--- a/grunt/autoprefixer-settings.js
+++ /dev/null
@@ -1,31 +0,0 @@
-module.exports = {
-  browsers: [
-    //
-    // Official browser support policy:
-    // http://v4-alpha.getbootstrap.com/getting-started/browsers-devices/#supported-browsers
-    //
-    'Chrome >= 35', // Exact version number here is kinda arbitrary
-    // Rather than using Autoprefixer's native "Firefox ESR" version specifier string,
-    // we deliberately hardcode the number. This is to avoid unwittingly severely breaking the previous ESR in the event that:
-    // (a) we happen to ship a new Bootstrap release soon after the release of a new ESR,
-    //     such that folks haven't yet had a reasonable amount of time to upgrade; and
-    // (b) the new ESR has unprefixed CSS properties/values whose absence would severely break webpages
-    //     (e.g. `box-sizing`, as opposed to `background: linear-gradient(...)`).
-    //     Since they've been unprefixed, Autoprefixer will stop prefixing them,
-    //     thus causing them to not work in the previous ESR (where the prefixes were required).
-    'Firefox >= 38', // Current Firefox Extended Support Release (ESR); https://www.mozilla.org/en-US/firefox/organizations/faq/
-    // Note: Edge versions in Autoprefixer & Can I Use refer to the EdgeHTML rendering engine version,
-    // NOT the Edge app version shown in Edge's "About" screen.
-    // For example, at the time of writing, Edge 20 on an up-to-date system uses EdgeHTML 12.
-    // See also https://github.com/Fyrd/caniuse/issues/1928
-    'Edge >= 12',
-    'Explorer >= 9',
-    // Out of leniency, we prefix these 1 version further back than the official policy.
-    'iOS >= 8',
-    'Safari >= 8',
-    // The following remain NOT officially supported, but we're lenient and include their prefixes to avoid severely breaking in them.
-    'Android 2.3',
-    'Android >= 4',
-    'Opera >= 12'
-  ]
-}
diff --git a/grunt/npm-shrinkwrap.json b/grunt/npm-shrinkwrap.json
index 268960b483..243b9ecf27 100644
--- a/grunt/npm-shrinkwrap.json
+++ b/grunt/npm-shrinkwrap.json
@@ -3,19 +3,19 @@
   "version": "4.0.0-alpha.2",
   "dependencies": {
     "abbrev": {
-      "version": "1.0.7",
+      "version": "1.0.9",
       "from": "abbrev@>=1.0.0 <2.0.0",
-      "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.0.7.tgz"
+      "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.0.9.tgz"
     },
     "accepts": {
-      "version": "1.2.13",
-      "from": "accepts@>=1.2.13 <1.3.0",
-      "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.2.13.tgz"
+      "version": "1.3.3",
+      "from": "accepts@>=1.3.3 <1.4.0",
+      "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.3.tgz"
     },
     "acorn": {
-      "version": "3.1.0",
-      "from": "acorn@>=3.1.0 <4.0.0",
-      "resolved": "https://registry.npmjs.org/acorn/-/acorn-3.1.0.tgz"
+      "version": "3.2.0",
+      "from": "acorn@>=3.2.0 <4.0.0",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-3.2.0.tgz"
     },
     "acorn-jsx": {
       "version": "3.0.1",
@@ -57,6 +57,11 @@
       "from": "ansi-styles@>=2.2.1 <3.0.0",
       "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-2.2.1.tgz"
     },
+    "anymatch": {
+      "version": "1.3.0",
+      "from": "anymatch@>=1.3.0 <2.0.0",
+      "resolved": "https://registry.npmjs.org/anymatch/-/anymatch-1.3.0.tgz"
+    },
     "archiver": {
       "version": "1.0.0",
       "from": "archiver@>=1.0.0 <2.0.0",
@@ -84,6 +89,16 @@
       "from": "argparse@>=1.0.7 <2.0.0",
       "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.7.tgz"
     },
+    "arr-diff": {
+      "version": "2.0.0",
+      "from": "arr-diff@>=2.0.0 <3.0.0",
+      "resolved": "https://registry.npmjs.org/arr-diff/-/arr-diff-2.0.0.tgz"
+    },
+    "arr-flatten": {
+      "version": "1.0.1",
+      "from": "arr-flatten@>=1.0.1 <2.0.0",
+      "resolved": "https://registry.npmjs.org/arr-flatten/-/arr-flatten-1.0.1.tgz"
+    },
     "array-differ": {
       "version": "1.0.0",
       "from": "array-differ@>=1.0.0 <2.0.0",
@@ -100,14 +115,19 @@
       "resolved": "https://registry.npmjs.org/array-index/-/array-index-1.0.0.tgz"
     },
     "array-union": {
-      "version": "1.0.1",
+      "version": "1.0.2",
       "from": "array-union@>=1.0.1 <2.0.0",
-      "resolved": "https://registry.npmjs.org/array-union/-/array-union-1.0.1.tgz"
+      "resolved": "https://registry.npmjs.org/array-union/-/array-union-1.0.2.tgz"
     },
     "array-uniq": {
-      "version": "1.0.2",
+      "version": "1.0.3",
       "from": "array-uniq@>=1.0.1 <2.0.0",
-      "resolved": "https://registry.npmjs.org/array-uniq/-/array-uniq-1.0.2.tgz"
+      "resolved": "https://registry.npmjs.org/array-uniq/-/array-uniq-1.0.3.tgz"
+    },
+    "array-unique": {
+      "version": "0.2.1",
+      "from": "array-unique@>=0.2.1 <0.3.0",
+      "resolved": "https://registry.npmjs.org/array-unique/-/array-unique-0.2.1.tgz"
     },
     "arrify": {
       "version": "1.0.1",
@@ -139,6 +159,11 @@
       "from": "async@>=0.1.22 <0.2.0",
       "resolved": "https://registry.npmjs.org/async/-/async-0.1.22.tgz"
     },
+    "async-each": {
+      "version": "1.0.0",
+      "from": "async-each@>=1.0.0 <2.0.0",
+      "resolved": "https://registry.npmjs.org/async-each/-/async-each-1.0.0.tgz"
+    },
     "async-foreach": {
       "version": "0.1.3",
       "from": "async-foreach@>=0.1.3 <0.2.0",
@@ -309,14 +334,14 @@
       "resolved": "https://registry.npmjs.org/babel-traverse/-/babel-traverse-6.9.0.tgz"
     },
     "babel-types": {
-      "version": "6.9.1",
+      "version": "6.10.2",
       "from": "babel-types@>=6.0.19 <7.0.0",
-      "resolved": "https://registry.npmjs.org/babel-types/-/babel-types-6.9.1.tgz"
+      "resolved": "https://registry.npmjs.org/babel-types/-/babel-types-6.10.2.tgz"
     },
     "babylon": {
-      "version": "6.8.0",
+      "version": "6.8.1",
       "from": "babylon@>=6.0.18 <7.0.0",
-      "resolved": "https://registry.npmjs.org/babylon/-/babylon-6.8.0.tgz"
+      "resolved": "https://registry.npmjs.org/babylon/-/babylon-6.8.1.tgz"
     },
     "balanced-match": {
       "version": "0.4.1",
@@ -333,6 +358,11 @@
       "from": "batch@0.5.3",
       "resolved": "https://registry.npmjs.org/batch/-/batch-0.5.3.tgz"
     },
+    "binary-extensions": {
+      "version": "1.4.1",
+      "from": "binary-extensions@>=1.0.0 <2.0.0",
+      "resolved": "https://registry.npmjs.org/binary-extensions/-/binary-extensions-1.4.1.tgz"
+    },
     "bl": {
       "version": "1.1.2",
       "from": "bl@>=1.0.0 <2.0.0",
@@ -344,15 +374,20 @@
       "resolved": "https://registry.npmjs.org/block-stream/-/block-stream-0.0.9.tgz"
     },
     "bluebird": {
-      "version": "3.4.0",
+      "version": "3.4.1",
       "from": "bluebird@>=3.1.1 <4.0.0",
-      "resolved": "https://registry.npmjs.org/bluebird/-/bluebird-3.4.0.tgz"
+      "resolved": "https://registry.npmjs.org/bluebird/-/bluebird-3.4.1.tgz"
     },
     "body-parser": {
       "version": "1.14.2",
       "from": "body-parser@>=1.14.0 <1.15.0",
       "resolved": "https://registry.npmjs.org/body-parser/-/body-parser-1.14.2.tgz",
       "dependencies": {
+        "http-errors": {
+          "version": "1.3.1",
+          "from": "http-errors@>=1.3.1 <1.4.0",
+          "resolved": "https://registry.npmjs.org/http-errors/-/http-errors-1.3.1.tgz"
+        },
         "iconv-lite": {
           "version": "0.4.13",
           "from": "iconv-lite@0.4.13",
@@ -366,9 +401,14 @@
       "resolved": "https://registry.npmjs.org/boom/-/boom-2.10.1.tgz"
     },
     "brace-expansion": {
-      "version": "1.1.4",
+      "version": "1.1.5",
       "from": "brace-expansion@>=1.0.0 <2.0.0",
-      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.4.tgz"
+      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.5.tgz"
+    },
+    "braces": {
+      "version": "1.8.5",
+      "from": "braces@>=1.8.2 <2.0.0",
+      "resolved": "https://registry.npmjs.org/braces/-/braces-1.8.5.tgz"
     },
     "breakable": {
       "version": "1.0.0",
@@ -428,9 +468,9 @@
       }
     },
     "caniuse-db": {
-      "version": "1.0.30000472",
+      "version": "1.0.30000484",
       "from": "caniuse-db@>=1.0.30000444 <2.0.0",
-      "resolved": "https://registry.npmjs.org/caniuse-db/-/caniuse-db-1.0.30000472.tgz"
+      "resolved": "https://registry.npmjs.org/caniuse-db/-/caniuse-db-1.0.30000484.tgz"
     },
     "caseless": {
       "version": "0.11.0",
@@ -454,10 +494,15 @@
         }
       }
     },
+    "chokidar": {
+      "version": "1.5.2",
+      "from": "chokidar@>=1.0.3 <2.0.0",
+      "resolved": "https://registry.npmjs.org/chokidar/-/chokidar-1.5.2.tgz"
+    },
     "clean-css": {
-      "version": "3.4.17",
+      "version": "3.4.18",
       "from": "clean-css@>=3.4.2 <3.5.0",
-      "resolved": "https://registry.npmjs.org/clean-css/-/clean-css-3.4.17.tgz",
+      "resolved": "https://registry.npmjs.org/clean-css/-/clean-css-3.4.18.tgz",
       "dependencies": {
         "commander": {
           "version": "2.8.1",
@@ -612,33 +657,11 @@
       "from": "cross-spawn@>=0.2.3 <0.3.0",
       "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-0.2.9.tgz"
     },
-    "cross-spawn-async": {
-      "version": "2.2.4",
-      "from": "cross-spawn-async@>=2.1.9 <3.0.0",
-      "resolved": "https://registry.npmjs.org/cross-spawn-async/-/cross-spawn-async-2.2.4.tgz",
-      "dependencies": {
-        "lru-cache": {
-          "version": "4.0.1",
-          "from": "lru-cache@>=4.0.0 <5.0.0",
-          "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-4.0.1.tgz"
-        },
-        "which": {
-          "version": "1.2.9",
-          "from": "which@>=1.2.8 <2.0.0",
-          "resolved": "https://registry.npmjs.org/which/-/which-1.2.9.tgz"
-        }
-      }
-    },
     "cryptiles": {
       "version": "2.0.5",
       "from": "cryptiles@>=2.0.0 <3.0.0",
       "resolved": "https://registry.npmjs.org/cryptiles/-/cryptiles-2.0.5.tgz"
     },
-    "css-mq-parser": {
-      "version": "0.0.3",
-      "from": "css-mq-parser@>=0.0.3 <0.0.4",
-      "resolved": "https://registry.npmjs.org/css-mq-parser/-/css-mq-parser-0.0.3.tgz"
-    },
     "cst": {
       "version": "0.3.0",
       "from": "cst@>=0.3.0 <0.4.0",
@@ -853,6 +876,11 @@
       "from": "ee-first@1.1.1",
       "resolved": "https://registry.npmjs.org/ee-first/-/ee-first-1.1.1.tgz"
     },
+    "encodeurl": {
+      "version": "1.0.1",
+      "from": "encodeurl@>=1.0.1 <1.1.0",
+      "resolved": "https://registry.npmjs.org/encodeurl/-/encodeurl-1.0.1.tgz"
+    },
     "end-of-stream": {
       "version": "1.1.0",
       "from": "end-of-stream@>=1.0.0 <2.0.0",
@@ -921,14 +949,14 @@
       "resolved": "https://registry.npmjs.org/escope/-/escope-3.6.0.tgz"
     },
     "eslint": {
-      "version": "2.11.1",
+      "version": "2.13.0",
       "from": "eslint@>=2.11.1 <3.0.0",
-      "resolved": "https://registry.npmjs.org/eslint/-/eslint-2.11.1.tgz",
+      "resolved": "https://registry.npmjs.org/eslint/-/eslint-2.13.0.tgz",
       "dependencies": {
         "globals": {
-          "version": "9.7.0",
+          "version": "9.8.0",
           "from": "globals@>=9.2.0 <10.0.0",
-          "resolved": "https://registry.npmjs.org/globals/-/globals-9.7.0.tgz"
+          "resolved": "https://registry.npmjs.org/globals/-/globals-9.8.0.tgz"
         },
         "shelljs": {
           "version": "0.6.0",
@@ -938,9 +966,9 @@
       }
     },
     "espree": {
-      "version": "3.1.4",
-      "from": "espree@3.1.4",
-      "resolved": "https://registry.npmjs.org/espree/-/espree-3.1.4.tgz"
+      "version": "3.1.6",
+      "from": "espree@>=3.1.6 <4.0.0",
+      "resolved": "https://registry.npmjs.org/espree/-/espree-3.1.6.tgz"
     },
     "esprima": {
       "version": "2.7.2",
@@ -994,11 +1022,26 @@
       "from": "exit-hook@>=1.0.0 <2.0.0",
       "resolved": "https://registry.npmjs.org/exit-hook/-/exit-hook-1.1.1.tgz"
     },
+    "expand-brackets": {
+      "version": "0.1.5",
+      "from": "expand-brackets@>=0.1.4 <0.2.0",
+      "resolved": "https://registry.npmjs.org/expand-brackets/-/expand-brackets-0.1.5.tgz"
+    },
+    "expand-range": {
+      "version": "1.8.2",
+      "from": "expand-range@>=1.8.1 <2.0.0",
+      "resolved": "https://registry.npmjs.org/expand-range/-/expand-range-1.8.2.tgz"
+    },
     "extend": {
       "version": "3.0.0",
       "from": "extend@>=3.0.0 <3.1.0",
       "resolved": "https://registry.npmjs.org/extend/-/extend-3.0.0.tgz"
     },
+    "extglob": {
+      "version": "0.3.2",
+      "from": "extglob@>=0.3.1 <0.4.0",
+      "resolved": "https://registry.npmjs.org/extglob/-/extglob-0.3.2.tgz"
+    },
     "extract-zip": {
       "version": "1.5.0",
       "from": "extract-zip@>=1.5.0 <1.6.0",
@@ -1078,6 +1121,16 @@
       "from": "file-sync-cmp@>=0.1.0 <0.2.0",
       "resolved": "https://registry.npmjs.org/file-sync-cmp/-/file-sync-cmp-0.1.1.tgz"
     },
+    "filename-regex": {
+      "version": "2.0.0",
+      "from": "filename-regex@>=2.0.0 <3.0.0",
+      "resolved": "https://registry.npmjs.org/filename-regex/-/filename-regex-2.0.0.tgz"
+    },
+    "fill-range": {
+      "version": "2.2.3",
+      "from": "fill-range@>=2.1.0 <3.0.0",
+      "resolved": "https://registry.npmjs.org/fill-range/-/fill-range-2.2.3.tgz"
+    },
     "finalhandler": {
       "version": "0.4.1",
       "from": "finalhandler@0.4.1",
@@ -1122,6 +1175,16 @@
       "from": "flat-cache@>=1.0.9 <2.0.0",
       "resolved": "https://registry.npmjs.org/flat-cache/-/flat-cache-1.0.10.tgz"
     },
+    "for-in": {
+      "version": "0.1.5",
+      "from": "for-in@>=0.1.5 <0.2.0",
+      "resolved": "https://registry.npmjs.org/for-in/-/for-in-0.1.5.tgz"
+    },
+    "for-own": {
+      "version": "0.1.4",
+      "from": "for-own@>=0.1.3 <0.2.0",
+      "resolved": "https://registry.npmjs.org/for-own/-/for-own-0.1.4.tgz"
+    },
     "forever-agent": {
       "version": "0.6.1",
       "from": "forever-agent@>=0.6.1 <0.7.0",
@@ -1154,10 +1217,647 @@
       "from": "fs-readdir-recursive@>=0.1.0 <0.2.0",
       "resolved": "https://registry.npmjs.org/fs-readdir-recursive/-/fs-readdir-recursive-0.1.2.tgz"
     },
+    "fs.realpath": {
+      "version": "1.0.0",
+      "from": "fs.realpath@>=1.0.0 <2.0.0",
+      "resolved": "https://registry.npmjs.org/fs.realpath/-/fs.realpath-1.0.0.tgz"
+    },
+    "fsevents": {
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+          "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-2.1.1.tgz"
+        },
+        "cliui": {
+          "version": "3.2.0",
+          "from": "cliui@>=3.0.3 <4.0.0",
+          "resolved": "https://registry.npmjs.org/cliui/-/cliui-3.2.0.tgz"
+        },
+        "glob": {
+          "version": "5.0.15",
+          "from": "glob@>=5.0.3 <6.0.0",
+          "resolved": "https://registry.npmjs.org/glob/-/glob-5.0.15.tgz"
+        },
+        "globby": {
+          "version": "3.0.1",
+          "from": "globby@>=3.0.1 <4.0.0",
+          "resolved": "https://registry.npmjs.org/globby/-/globby-3.0.1.tgz"
+        },
+        "pinkie": {
+          "version": "1.0.0",
+          "from": "pinkie@>=1.0.0 <2.0.0",
+          "resolved": "https://registry.npmjs.org/pinkie/-/pinkie-1.0.0.tgz"
+        },
+        "pinkie-promise": {
+          "version": "1.0.0",
+          "from": "pinkie-promise@>=1.0.0 <2.0.0",
+          "resolved": "https://registry.npmjs.org/pinkie-promise/-/pinkie-promise-1.0.0.tgz"
+        },
+        "yargs": {
+          "version": "3.32.0",
+          "from": "yargs@>=3.32.0 <4.0.0",
+          "resolved": "https://registry.npmjs.org/yargs/-/yargs-3.32.0.tgz"
+        }
+      }
+    },
     "postcss-flexbugs-fixes": {
       "version": "2.0.0",
       "from": "postcss-flexbugs-fixes@>=2.0.0 <3.0.0",
@@ -2529,6 +3368,11 @@
       "from": "prelude-ls@>=1.1.2 <1.2.0",
       "resolved": "https://registry.npmjs.org/prelude-ls/-/prelude-ls-1.1.2.tgz"
     },
+    "preserve": {
+      "version": "0.2.0",
+      "from": "preserve@>=0.2.0 <0.3.0",
+      "resolved": "https://registry.npmjs.org/preserve/-/preserve-0.2.0.tgz"
+    },
     "pretty-bytes": {
       "version": "3.0.1",
       "from": "pretty-bytes@>=3.0.1 <4.0.0",
@@ -2574,20 +3418,25 @@
       "from": "qs@>=5.2.0 <5.3.0",
       "resolved": "https://registry.npmjs.org/qs/-/qs-5.2.0.tgz"
     },
+    "randomatic": {
+      "version": "1.1.5",
+      "from": "randomatic@>=1.1.3 <2.0.0",
+      "resolved": "https://registry.npmjs.org/randomatic/-/randomatic-1.1.5.tgz"
+    },
     "range-parser": {
-      "version": "1.0.3",
-      "from": "range-parser@>=1.0.3 <1.1.0",
-      "resolved": "https://registry.npmjs.org/range-parser/-/range-parser-1.0.3.tgz"
+      "version": "1.2.0",
+      "from": "range-parser@>=1.2.0 <1.3.0",
+      "resolved": "https://registry.npmjs.org/range-parser/-/range-parser-1.2.0.tgz"
     },
     "raw-body": {
-      "version": "2.1.6",
+      "version": "2.1.7",
       "from": "raw-body@>=2.1.5 <2.2.0",
-      "resolved": "https://registry.npmjs.org/raw-body/-/raw-body-2.1.6.tgz",
+      "resolved": "https://registry.npmjs.org/raw-body/-/raw-body-2.1.7.tgz",
       "dependencies": {
         "bytes": {
-          "version": "2.3.0",
-          "from": "bytes@2.3.0",
-          "resolved": "https://registry.npmjs.org/bytes/-/bytes-2.3.0.tgz"
+          "version": "2.4.0",
+          "from": "bytes@2.4.0",
+          "resolved": "https://registry.npmjs.org/bytes/-/bytes-2.4.0.tgz"
         },
         "iconv-lite": {
           "version": "0.4.13",
@@ -2601,6 +3450,11 @@
       "from": "read@>=1.0.0 <1.1.0",
       "resolved": "https://registry.npmjs.org/read/-/read-1.0.7.tgz"
     },
+    "read-file-stdin": {
+      "version": "0.2.1",
+      "from": "read-file-stdin@>=0.2.0 <0.3.0",
+      "resolved": "https://registry.npmjs.org/read-file-stdin/-/read-file-stdin-0.2.1.tgz"
+    },
     "read-json-sync": {
       "version": "1.1.1",
       "from": "read-json-sync@>=1.1.0 <2.0.0",
@@ -2621,6 +3475,18 @@
       "from": "readable-stream@>=2.0.0 <2.1.0",
       "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-2.0.6.tgz"
     },
+    "readdirp": {
+      "version": "2.0.0",
+      "from": "readdirp@>=2.0.0 <3.0.0",
+      "resolved": "https://registry.npmjs.org/readdirp/-/readdirp-2.0.0.tgz",
+      "dependencies": {
+        "minimatch": {
+          "version": "2.0.10",
+          "from": "minimatch@>=2.0.10 <3.0.0",
+          "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-2.0.10.tgz"
+        }
+      }
+    },
     "readline2": {
       "version": "1.0.1",
       "from": "readline2@>=1.0.1 <2.0.0",
@@ -2670,6 +3536,11 @@
       "from": "regenerator-runtime@>=0.9.5 <0.10.0",
       "resolved": "https://registry.npmjs.org/regenerator-runtime/-/regenerator-runtime-0.9.5.tgz"
     },
+    "regex-cache": {
+      "version": "0.4.3",
+      "from": "regex-cache@>=0.4.2 <0.5.0",
+      "resolved": "https://registry.npmjs.org/regex-cache/-/regex-cache-0.4.3.tgz"
+    },
     "regexpu": {
       "version": "1.3.0",
       "from": "regexpu@>=1.3.0 <2.0.0",
@@ -2685,6 +3556,11 @@
       "from": "regjsparser@>=0.1.4 <0.2.0",
       "resolved": "https://registry.npmjs.org/regjsparser/-/regjsparser-0.1.5.tgz"
     },
+    "repeat-element": {
+      "version": "1.1.2",
+      "from": "repeat-element@>=1.1.2 <2.0.0",
+      "resolved": "https://registry.npmjs.org/repeat-element/-/repeat-element-1.1.2.tgz"
+    },
     "repeat-string": {
       "version": "1.5.4",
       "from": "repeat-string@>=1.5.2 <2.0.0",
@@ -2841,6 +3717,11 @@
         }
       }
     },
+    "require-main-filename": {
+      "version": "1.0.1",
+      "from": "require-main-filename@>=1.0.1 <2.0.0",
+      "resolved": "https://registry.npmjs.org/require-main-filename/-/require-main-filename-1.0.1.tgz"
+    },
     "require-uncached": {
       "version": "1.0.2",
       "from": "require-uncached@>=1.0.2 <2.0.0",
@@ -2904,14 +3785,29 @@
       "resolved": "https://registry.npmjs.org/rx-lite/-/rx-lite-3.1.2.tgz"
     },
     "sass-graph": {
-      "version": "2.1.1",
+      "version": "2.1.2",
       "from": "sass-graph@>=2.1.1 <3.0.0",
-      "resolved": "https://registry.npmjs.org/sass-graph/-/sass-graph-2.1.1.tgz",
+      "resolved": "https://registry.npmjs.org/sass-graph/-/sass-graph-2.1.2.tgz",
       "dependencies": {
-        "glob": {
-          "version": "6.0.4",
-          "from": "glob@>=6.0.4 <7.0.0",
-          "resolved": "https://registry.npmjs.org/glob/-/glob-6.0.4.tgz"
+        "camelcase": {
+          "version": "3.0.0",
+          "from": "camelcase@>=3.0.0 <4.0.0",
+          "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-3.0.0.tgz"
+        },
+        "cliui": {
+          "version": "3.2.0",
+          "from": "cliui@>=3.2.0 <4.0.0",
+          "resolved": "https://registry.npmjs.org/cliui/-/cliui-3.2.0.tgz"
+        },
+        "window-size": {
+          "version": "0.2.0",
+          "from": "window-size@>=0.2.0 <0.3.0",
+          "resolved": "https://registry.npmjs.org/window-size/-/window-size-0.2.0.tgz"
+        },
+        "yargs": {
+          "version": "4.7.1",
+          "from": "yargs@>=4.7.1 <5.0.0",
+          "resolved": "https://registry.npmjs.org/yargs/-/yargs-4.7.1.tgz"
         }
       }
     },
@@ -3072,32 +3968,35 @@
       "resolved": "https://registry.npmjs.org/semver/-/semver-4.3.6.tgz"
     },
     "send": {
-      "version": "0.13.2",
-      "from": "send@0.13.2",
-      "resolved": "https://registry.npmjs.org/send/-/send-0.13.2.tgz",
-      "dependencies": {
-        "statuses": {
-          "version": "1.2.1",
-          "from": "statuses@>=1.2.1 <1.3.0",
-          "resolved": "https://registry.npmjs.org/statuses/-/statuses-1.2.1.tgz"
-        }
-      }
+      "version": "0.14.1",
+      "from": "send@0.14.1",
+      "resolved": "https://registry.npmjs.org/send/-/send-0.14.1.tgz"
     },
     "serve-index": {
-      "version": "1.7.3",
+      "version": "1.8.0",
       "from": "serve-index@>=1.7.1 <2.0.0",
-      "resolved": "https://registry.npmjs.org/serve-index/-/serve-index-1.7.3.tgz"
+      "resolved": "https://registry.npmjs.org/serve-index/-/serve-index-1.8.0.tgz"
     },
     "serve-static": {
-      "version": "1.10.3",
+      "version": "1.11.1",
       "from": "serve-static@>=1.10.0 <2.0.0",
-      "resolved": "https://registry.npmjs.org/serve-static/-/serve-static-1.10.3.tgz"
+      "resolved": "https://registry.npmjs.org/serve-static/-/serve-static-1.11.1.tgz"
+    },
+    "set-blocking": {
+      "version": "1.0.0",
+      "from": "set-blocking@>=1.0.0 <2.0.0",
+      "resolved": "https://registry.npmjs.org/set-blocking/-/set-blocking-1.0.0.tgz"
     },
     "set-immediate-shim": {
       "version": "1.0.1",
       "from": "set-immediate-shim@>=1.0.0 <2.0.0",
       "resolved": "https://registry.npmjs.org/set-immediate-shim/-/set-immediate-shim-1.0.1.tgz"
     },
+    "setprototypeof": {
+      "version": "1.0.1",
+      "from": "setprototypeof@1.0.1",
+      "resolved": "https://registry.npmjs.org/setprototypeof/-/setprototypeof-1.0.1.tgz"
+    },
     "shebang-regex": {
       "version": "1.0.0",
       "from": "shebang-regex@>=1.0.0 <2.0.0",
@@ -3114,9 +4013,9 @@
       "resolved": "https://registry.npmjs.org/sigmund/-/sigmund-1.0.1.tgz"
     },
     "signal-exit": {
-      "version": "2.1.2",
-      "from": "signal-exit@>=2.1.2 <3.0.0",
-      "resolved": "https://registry.npmjs.org/signal-exit/-/signal-exit-2.1.2.tgz"
+      "version": "3.0.0",
+      "from": "signal-exit@>=3.0.0 <4.0.0",
+      "resolved": "https://registry.npmjs.org/signal-exit/-/signal-exit-3.0.0.tgz"
     },
     "simple-fmt": {
       "version": "0.1.0",
@@ -3214,7 +4113,7 @@
     },
     "statuses": {
       "version": "1.3.0",
-      "from": "statuses@>=1.0.0 <2.0.0",
+      "from": "statuses@>=1.3.0 <2.0.0",
       "resolved": "https://registry.npmjs.org/statuses/-/statuses-1.3.0.tgz"
     },
     "stream-buffers": {
@@ -3272,6 +4171,11 @@
       "from": "supports-color@>=3.1.2 <4.0.0",
       "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-3.1.2.tgz"
     },
+    "symbol": {
+      "version": "0.2.3",
+      "from": "symbol@>=0.2.1 <0.3.0",
+      "resolved": "https://registry.npmjs.org/symbol/-/symbol-0.2.3.tgz"
+    },
     "table": {
       "version": "3.7.8",
       "from": "table@>=3.7.8 <4.0.0",
@@ -3410,9 +4314,9 @@
       "resolved": "https://registry.npmjs.org/typedarray/-/typedarray-0.0.6.tgz"
     },
     "uglify-js": {
-      "version": "2.6.2",
+      "version": "2.6.3",
       "from": "uglify-js@>=2.6.2 <2.7.0",
-      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-2.6.2.tgz",
+      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-2.6.3.tgz",
       "dependencies": {
         "async": {
           "version": "0.2.10",
@@ -3567,6 +4471,11 @@
       "from": "wordwrap@>=1.0.0 <1.1.0",
       "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-1.0.0.tgz"
     },
+    "wrap-ansi": {
+      "version": "2.0.0",
+      "from": "wrap-ansi@>=2.0.0 <3.0.0",
+      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-2.0.0.tgz"
+    },
     "wrappy": {
       "version": "1.0.2",
       "from": "wrappy@>=1.0.0 <2.0.0",
@@ -3614,6 +4523,18 @@
       "from": "yargs@>=3.27.0 <3.28.0",
       "resolved": "https://registry.npmjs.org/yargs/-/yargs-3.27.0.tgz"
     },
+    "yargs-parser": {
+      "version": "2.4.0",
+      "from": "yargs-parser@>=2.4.0 <3.0.0",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-2.4.0.tgz",
+      "dependencies": {
+        "camelcase": {
+          "version": "2.1.1",
+          "from": "camelcase@>=2.1.1 <3.0.0",
+          "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-2.1.1.tgz"
+        }
+      }
+    },
     "yauzl": {
       "version": "2.4.1",
       "from": "yauzl@2.4.1",
diff --git a/grunt/postcss.js b/grunt/postcss.js
new file mode 100644
index 0000000000..a6fc411ff1
--- /dev/null
+++ b/grunt/postcss.js
@@ -0,0 +1,42 @@
+module.exports = {
+  use: [
+    'postcss-flexbugs-fixes',
+    'autoprefixer'
+  ],
+  map: {
+    inline: false,
+    annotation: true,
+    sourcesContent: true
+  },
+  autoprefixer: {
+    browsers: [
+      //
+      // Official browser support policy:
+      // http://v4-alpha.getbootstrap.com/getting-started/browsers-devices/#supported-browsers
+      //
+      'Chrome >= 35', // Exact version number here is kinda arbitrary
+      // Rather than using Autoprefixer's native "Firefox ESR" version specifier string,
+      // we deliberately hardcode the number. This is to avoid unwittingly severely breaking the previous ESR in the event that:
+      // (a) we happen to ship a new Bootstrap release soon after the release of a new ESR,
+      //     such that folks haven't yet had a reasonable amount of time to upgrade; and
+      // (b) the new ESR has unprefixed CSS properties/values whose absence would severely break webpages
+      //     (e.g. `box-sizing`, as opposed to `background: linear-gradient(...)`).
+      //     Since they've been unprefixed, Autoprefixer will stop prefixing them,
+      //     thus causing them to not work in the previous ESR (where the prefixes were required).
+      'Firefox >= 38', // Current Firefox Extended Support Release (ESR); https://www.mozilla.org/en-US/firefox/organizations/faq/
+      // Note: Edge versions in Autoprefixer & Can I Use refer to the EdgeHTML rendering engine version,
+      // NOT the Edge app version shown in Edge's "About" screen.
+      // For example, at the time of writing, Edge 20 on an up-to-date system uses EdgeHTML 12.
+      // See also https://github.com/Fyrd/caniuse/issues/1928
+      'Edge >= 12',
+      'Explorer >= 9',
+      // Out of leniency, we prefix these 1 version further back than the official policy.
+      'iOS >= 8',
+      'Safari >= 8',
+      // The following remain NOT officially supported, but we're lenient and include their prefixes to avoid severely breaking in them.
+      'Android 2.3',
+      'Android >= 4',
+      'Opera >= 12'
+    ]
+  }
+}
diff --git a/package.json b/package.json
index 87d5615dce..eebbb2eee5 100644
--- a/package.json
+++ b/package.json
@@ -13,12 +13,16 @@
   ],
   "homepage": "http://getbootstrap.com",
   "author": "The Bootstrap Authors (https://github.com/twbs/bootstrap/graphs/contributors)",
-  "contributors": ["Twitter, Inc."],
+  "contributors": [
+    "Twitter, Inc."
+  ],
   "scripts": {
     "change-version": "node grunt/change-version.js",
     "shrinkwrap": "npm shrinkwrap --dev && mv ./npm-shrinkwrap.json ./grunt/npm-shrinkwrap.json",
     "eslint": "eslint --config js/.eslintrc.json js/src",
     "jscs": "jscs --config=js/.jscsrc js/src js/tests/unit docs/assets/js/src docs/assets/js/ie*.js grunt Gruntfile.js",
+    "postcss": "postcss --config grunt/postcss.js --replace dist/css/*.css",
+    "postcss-docs": "postcss --config grunt/postcss.js --no-map --replace docs/assets/css/docs.min.css && postcss --config grunt/postcss.js --no-map --replace docs/examples/**/*.css",
     "test": "npm run eslint && npm run jscs && grunt test"
   },
   "style": "dist/css/bootstrap.css",
@@ -56,7 +60,6 @@
     "grunt-exec": "^0.4.6",
     "grunt-html": "^7.0.0",
     "grunt-jekyll": "^0.4.2",
-    "grunt-postcss": "^0.8.0",
     "grunt-sass": "^1.0.0",
     "grunt-saucelabs": "^8.6.1",
     "grunt-scss-lint": "^0.3.8",
@@ -64,7 +67,7 @@
     "is-travis": "^1.0.0",
     "jscs": "^3.0.4",
     "load-grunt-tasks": "^3.4.0",
-    "mq4-hover-shim": "^0.3.0",
+    "postcss-cli": "^2.5.2",
     "postcss-flexbugs-fixes": "^2.0.0",
     "shelljs": "^0.7.0",
     "time-grunt": "^1.2.1"
diff --git a/scss/mixins/_hover.scss b/scss/mixins/_hover.scss
index 3a11254e84..4a648a54d3 100644
--- a/scss/mixins/_hover.scss
+++ b/scss/mixins/_hover.scss
@@ -1,14 +1,15 @@
 @mixin hover {
-  @if $enable-hover-media-query {
-    // See Media Queries Level 4: http://drafts.csswg.org/mediaqueries/#hover
-    // Currently shimmed by https://github.com/twbs/mq4-hover-shim
-    @media (hover: hover) {
-      &:hover { @content }
-    }
-  }
-  @else {
+  // TODO: re-enable along with mq4-hover-shim
+//  @if $enable-hover-media-query {
+//    // See Media Queries Level 4: http://drafts.csswg.org/mediaqueries/#hover
+//    // Currently shimmed by https://github.com/twbs/mq4-hover-shim
+//    @media (hover: hover) {
+//      &:hover { @content }
+//    }
+//  }
+//  @else {
     &:hover { @content }
-  }
+//  }
 }
 
 @mixin hover-focus {