function makePrefixMap(styleProp, eventName) {
	  var prefixes = {};

	  prefixes[styleProp.toLowerCase()] = eventName.toLowerCase();
	  prefixes['Webkit' + styleProp] = 'webkit' + eventName;
	  prefixes['Moz' + styleProp] = 'moz' + eventName;
	  prefixes['ms' + styleProp] = 'MS' + eventName;
	  prefixes['O' + styleProp] = 'o' + eventName.toLowerCase();

	  return prefixes;
	}
Generate a mapping of standard vendor prefixes using the defined style property and event name.

@param {string} styleProp
@param {string} eventName
@returns {object}