add css3-regions.vim

after/syntax/css/css3-break.vim

@@ -1,3 +1,2 @@
 " TODO: create cssBreakProp group and cssBreakAttr group
 syn match cssFontProp contained "\<break-\(after\|before\|inside\)\>"
-syn match cssFontAttr contained "\<\(avoid-\)\=region\>"

after/syntax/css/css3-regions.vim

@@ -0,0 +1,6 @@
+" TODO: create cssRegionsProp group and cssRegionsAttr group
+syn match cssFontProp contained "\<flow-\(from\|into\)\>"
+syn match cssFontProp contained "\<region-overflow\>"
+syn keyword cssFontAttr contained break
+syn match cssFontAttr contained "\<\(avoid-\)\=region\>"
+syn match cssTagName "@region\>" nextgroup=cssDefinition