CSS.supports

CSS.supports.js

/** github.com/termi/CSS.supports */
if( !global.CSS || !global.CSS.supports ) {
  if( !global.CSS ) {
		/**
		 * @expose
		 */
		global.CSS = {};
	}

	if( !global.CSS.supports && global["supportsCSS"] ) {// Opera 12.10 impl
		global.CSS.supports = global["supportsCSS"].bind(global);
	}
	else {
		var _CSS_supports_cache = {};
		/**
		 * @expose
		 */
		global.CSS.supports = function(msie, testElement, ToCamel_replacer, propertyName, propertyValue) {
			var name_and_value = propertyName + "\\/" + propertyValue;
			if( name_and_value in _CSS_supports_cache ) {
				return _CSS_supports_cache[name_and_value];
			}

			/* TODO:: for IE < 9:
			 _ = document.documentElement.appendChild(document.createElement("_"))
			 _.currentStyle[propertyName] == propertyValue
			 */
			if(arguments.length < 5) {
				throw new Error("WRONG_ARGUMENTS_ERR");//TODO:: DOMException ?
			}

			var __bind__RE_FIRST_LETTER = this
				, propertyName_CC = (propertyName + "").replace(__bind__RE_FIRST_LETTER, ToCamel_replacer)
			;

			var result = propertyName && propertyValue && (propertyName_CC in testElement.style);

			if( result ) {
				if( msie ) {
					if( /\(|\s/.test(propertyValue) ) {
						try {
							testElement.style[propertyName_CC] = propertyValue;// IE throw here, if unsupported this syntax. Exception: clip:rect(1px,1px,1px,1px)
							result = !!testElement.style[propertyName_CC];
						}
						catch(e) {
							result = false;
						}
					}
					else {
						testElement.style.cssText = "display:none;height:0;width:0;visibility:hidden;position:absolute;position:fixed;" + propertyName + ":" + propertyValue;
						document.documentElement.appendChild(testElement);
						result = testElement.currentStyle[propertyName_CC] == propertyValue;
						document.documentElement.removeChild(testElement);
					}
				}
				else {
					testElement.style.cssText = propertyName + ":" + propertyValue;
					result = testElement.style[propertyName_CC] == propertyValue;
				}
			}

			testElement.style.cssText = "";

			_CSS_supports_cache[name_and_value] = result;

			return result;
		}.bind(
			/(-)([a-z])/g // __bind__RE_FIRST_LETTER
			, "runtimeStyle" in document.documentElement
			, global["document"].createElement("_")
			, function(a, b, c) { // __bind__fromCSSPropToCamel_replacer
				return c.toUpperCase()
			}
		);
	}
}