if !hlexists('cssTransitionProp')
  syn match cssFontProp contained "\<transition\(-\(property\|duration\|timing-function\|delay\)\)\=\>"
  syn keyword cssFontAttr contained linear
  syn match cssFontAttr contained "\<ease\(-\(in\|out\|in-out\)\)\=\>"
  syn match cssFontAttr contained "\<step-\(start\|end\)\>"
  syn region cssFunction contained matchgroup=cssFunctionName start="\<\(steps\|cubic-bezier\)\s*(" end=")" oneline keepend
endif