Add css-display-3.vim and test

See also: http://www.w3.org/TR/2014/WD-css-display-3-20140220/

README.md

@@ -50,6 +50,7 @@ HISTORY
 
 ### v0.10 (in progress)
 
+  * Add CSS Display Module Level 3 features
   * Move Selectors Level 4 features correctly
   * Move page break values from `css3-multicol.vim` to `css3-page.vim`
   * Follow spec updates

after/syntax/css/css-display-3.vim

@@ -0,0 +1,6 @@
+if !hlexists('cssDisplayProp')
+  syn match cssFontProp contained "\<display-\(inside\|outside\|extras\|box\)\>"
+  syn keyword cssFontAttr contained contents
+  syn match cssFontAttr contained "\<\(block\|inline\)-level\>"
+  syn match cssFontAttr contained "\<inline-list-item\>"
+endif

after/syntax/html.vim

@@ -33,6 +33,7 @@ syn include @htmlCss syntax/css/css3-transitions.vim
 syn include @htmlCss syntax/css/css3-ui.vim
 syn include @htmlCss syntax/css/css3-values.vim
 syn include @htmlCss syntax/css/css-counter-styles-3.vim
+syn include @htmlCss syntax/css/css-display-3.vim
 syn include @htmlCss syntax/css/css-grid-1.vim
 syn include @htmlCss syntax/css/css-masking-1.vim
 syn include @htmlCss syntax/css/css-overflow-3.vim

test/test.css

@@ -108,6 +108,13 @@
   speak-as: auto;
 }
 
+.display {
+  display-inside: block-level;
+  display-outside: inline-level;
+  display-extras: inline-list-item;
+  display-box: contents;
+}
+
 .exclusions {
   wrap-flow: minimum;
   wrap-through: maximum;

test/test.html

@@ -118,6 +118,13 @@
         speak-as: auto;
       }
 
+      .display {
+        display-inside: block-level;
+        display-outside: inline-level;
+        display-extras: inline-list-item;
+        display-box: contents;
+      }
+
       .exclusions {
         wrap-flow: minimum;
         wrap-through: maximum;