var support_css3 = (function() {
 var div = document.createElement('div'),
  vendors = 'Ms O Moz Webkit'.split(' '),
  len = vendors.length;
 
 return function(prop) {
  if ( prop in div.style ) return true;
 
  prop = prop.replace(/^[a-z]/, function(val) {
   return val.toUpperCase();
  });
 
  while(len--) {
   if ( vendors[len] + prop in div.style ) {
   return true;
   } 
  }
  return false;
 };
})();

if(support_css3('transform')){

}else{

}

function isPropertySupported(property)
{
 return property in document.body.style;
}

if(isPropertySupported('opacity')){

}else{

}

//pass the same string as you pass to the @supports rule
if(CSS.supports("(background-color: red) and (color:white"))
{
 document.body.style.color = "white";
 document.body.style.backgroundColor = "red";
}

function elementSupportsAttribute(element, attribute) {
 var test = document.createElement(element);
 if (attribute in test) {
 return true;
 } else {
 return false;
 }
};

if (elementSupportsAttribute("textarea", "placeholder") {

} else {
 // fallback
}