Add css3-syntax.vim

See also: http://www.w3.org/TR/css3-syntax/

after/syntax/css/css3-syntax.vim

@@ -0,0 +1 @@
+" N/A

after/syntax/html.vim

@@ -48,6 +48,7 @@ syn include @htmlCss syntax/css/css3-regions.vim
 syn include @htmlCss syntax/css/css3-selectors.vim
 syn include @htmlCss syntax/css/css3-sizing.vim
 syn include @htmlCss syntax/css/css3-speech.vim
+syn include @htmlCss syntax/css/css3-syntax.vim
 syn include @htmlCss syntax/css/css3-transforms.vim
 syn include @htmlCss syntax/css/css3-transitions.vim
 syn include @htmlCss syntax/css/cssom-view.vim

test/test.css

@@ -553,6 +553,10 @@
   display: reduced;
 }
 
+.syntax {
+  display: auto;
+}
+
 .text-3 {
   hyphens: manual;
   line-break: loose;

test/test.html

@@ -610,6 +610,11 @@
 }
 </style>
 <style>
+.syntax {
+  display: auto;
+}
+</style>
+<style>
 .text-3 {
   hyphens: manual;
   line-break: loose;