" TODO: create cssBackgroundProp group and cssBackgroundAttr group
syn match cssFontProp contained "\<background-\(clip\|origin\|size\)\>"
syn match cssFontProp contained "\<border-image\(-\(source\|slice\|width\|outset\|repeat\)\)\=\>"
syn match cssFontProp contained "\<border-\(\(top-right\|bottom-right\|bottom-left\|top-left\)-\)\=radius\>"
syn match cssFontProp contained "\<box-shadow\>"
syn keyword cssFontAttr contained space round local fill stretch clone slice
syn match cssFontAttr contained "\<\(padding\|border\|content\)-box\>"