code: function prefixProp (name, inCSS) {
    // $prop will skip
    if(name[0]=='$') return ''
    // find name and cache the name for next time use
    var retName = cssProps[ name ] ||
        ( cssProps[ name ] = vendorPropName( name ) || name);
    return inCSS   // if hasPrefix in prop
      ? dashify(cssPrefixesReg.test(retName) ? capitalize(retName) : name=='float' && name || retName)  // fix float in CSS, avoid return cssFloat
    : retName
  }
docs: apply prop to get right vendor prefix inCSS false=camelcase; true=dashed