Why injectCSS?

The primary goal was to create an easy way to include multi-line (lots) of CSS using Javascript.
Can reduce number of files in a JS plugin or project (My goal was one).
A test run at jsperf.com shows that injecting CSS rules for a vast number of elements is very fast: http://jsperf.com/inject-vs-apply/2

How to use

With RequireJS

require(['injectCSS'], function(injectCSS) {
	injectCSS(function(){/*
		.case1 {
			border: 3px solid #0f0;
		}
	*/});
	injectCSS('.case2 { border: 3px solid #00f; } ');
});

On it's own with no dependencies

<!DOCTYPE html>
<head>
	<script src="injectCSS.js"></script>
</head>
<body>
	<div class="test case1">test case 1</div>
	<div class="test case2">test case 2</div>
<script>
	(function(){
		injectCSS(function(){/*
			.case1 {
				border: 3px solid #0f0;
			}
		*/});
		injectCSS('.case2 { border: 3px solid #00f; } ');
	})();
</script>
</body>
</html>

Compatability

Tested successfully on:

Chrome (+mobile)
Firefox
Safari (+mobile)
IE 10+

Due to the older IE browsers not allowing the innerHTML property to be set on certain elements, this will not work in them.

License

The MIT License (MIT)

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.