Index: node_modules/autoprefixer/lib/hacks/writing-mode.js
===================================================================
--- node_modules/autoprefixer/lib/hacks/writing-mode.js	(revision 2058e5c694bb6097866a5fe6503c519e8f74970f)
+++ node_modules/autoprefixer/lib/hacks/writing-mode.js	(revision 2058e5c694bb6097866a5fe6503c519e8f74970f)
@@ -0,0 +1,42 @@
+let Declaration = require('../declaration')
+
+class WritingMode extends Declaration {
+  insert(decl, prefix, prefixes) {
+    if (prefix === '-ms-') {
+      let cloned = this.set(this.clone(decl), prefix)
+
+      if (this.needCascade(decl)) {
+        cloned.raws.before = this.calcBefore(prefixes, decl, prefix)
+      }
+      let direction = 'ltr'
+
+      decl.parent.nodes.forEach(i => {
+        if (i.prop === 'direction') {
+          if (i.value === 'rtl' || i.value === 'ltr') direction = i.value
+        }
+      })
+
+      cloned.value = WritingMode.msValues[direction][decl.value] || decl.value
+      return decl.parent.insertBefore(decl, cloned)
+    }
+
+    return super.insert(decl, prefix, prefixes)
+  }
+}
+
+WritingMode.names = ['writing-mode']
+
+WritingMode.msValues = {
+  ltr: {
+    'horizontal-tb': 'lr-tb',
+    'vertical-lr': 'tb-lr',
+    'vertical-rl': 'tb-rl'
+  },
+  rtl: {
+    'horizontal-tb': 'rl-tb',
+    'vertical-lr': 'bt-lr',
+    'vertical-rl': 'bt-rl'
+  }
+}
+
+module.exports = WritingMode