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                <textarea rows="3" id="rules">
body { background: BurlyWood; }
div  { background: DarkGreen; color: Snow; }
div:hover { color: Black !important; }

<button id="btn" onclick="injectCSS( document.getElementById('rules').value )">Injects styles from the textarea</button>

	Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nulla placerat erat ut neque malesuada ut semper libero molestie.
	Maecenas iaculis felis a libero ultrices at pharetra odio luctus.

body { background: AntiqueWhite; }
div  { background: DarkGray; color: DarkBlue; }



                body, textarea, button, div {
	display: block; width: 600px; padding: 2px 6px; margin: 10px auto;
#btn { width: 250px; }


                // It's more appropriate to init this function after the DOM is ready
window.injectCSS = (function(doc){
	// wrapper for all injected styles and temp el to create them
	var wrap = doc.createElement('div');
	var temp = doc.createElement('div');
	// rules like "a {color: red}" etc.
	return function (cssRules) {
		// append wrapper to the body on the first call
		if (! { = 'injected-css'; = 'none';
		// <br> for IE:
		temp.innerHTML = '<br><style>'+ cssRules +'</style>';
		wrap.appendChild( temp.children[1] );
We'd ask you for an infinite loop joke, but we'd never hear the end of it.