Fix: Term element in content value gets parsed (#1414)

* Fix: Term element in content value gets parsed

* Remove duplicate css and change check

lib/processor.js

@@ -497,6 +497,9 @@ class Processor {
         return true
       }
     }
+    if (node.type === 'decl' && node.prop === 'content') {
+      return true
+    }
 
     return this.disabled(node, result)
   }

test/autoprefixer.test.ts

@@ -86,6 +86,15 @@ let clipper = autoprefixer({
 let example = autoprefixer({
   overrideBrowserslist: ['defaults']
 })
+let content = autoprefixer({
+  overrideBrowserslist: [
+    '> 2%',
+    'last 2 years',
+    'ie 11',
+    'not ie_mob > 0',
+    'not dead'
+  ]
+})
 
 function prefixer(name: string): Plugin {
   if (
@@ -162,6 +171,8 @@ function prefixer(name: string): Plugin {
     return supporter
   } else if (name === 'transition-spec') {
     return transitionSpec
+  } else if (name === 'content') {
+    return content
   } else {
     return compiler
   }
@@ -370,6 +381,11 @@ it('transition on vendor specific rule', () => {
 it('ignore prefix in vendor at rules', () => {
   check('at-rules')
 })
+it('ignore content property', () => {
+  let input = read('content')
+  let result = postcss([prefixer('scope')]).process(input)
+  expect(result.css).toEqual(input)
+})
 
 it('uses control comments to whole scope', () => {
   let input = read('scope')

test/cases/content.css

@@ -0,0 +1,3 @@
+a {
+  content: "Element 'div' not allowed as child of element 'span' in this context.";
+}