" TODO: create cssBackgroundProp group and cssBackgroundAttr group
syn match cssFontProp contained "\<background-\(origin\|clip\|size\)\>"
syn match cssFontProp contained "\<border-\(color\|image\(-\(source\|slice\|width\|outset\|repeat\)\)\=\|radius\)\>"
syn match cssFontProp contained "\<box-\(decoration-break\|shadow\)\>"
syn keyword cssFontAttr contained stretch round fill alice clone