When you need make css preview online you can use that

example

coffeescript function code cod

cssStyleInjector = (cssText, id="default", elem="head") ->
 thisCss = document.getElementById(id)
 return thisCss.innerHTML = cssText if thisCss?
 css = document.createElement("style")
 css.setAttribute "type", "text/css"
 css.setAttribute "id", id
 style = document.createTextNode(cssText)
 css.appendChild style
 document[elem].appendChild css

javascript function code

var cssStyleInjector;

cssStyleInjector = function(cssText, id, elem) {
 var css, style, thisCss;
 if (id == null) { id = "default"; }
 if (elem == null) { elem = "head"; }
 thisCss = document.getElementById(id);
 if (thisCss != null) { return thisCss.innerHTML = cssText; }
 css = document.createElement("style");
 css.setAttribute("type", "text/css");
 css.setAttribute("id", id);
 style = document.createTextNode(cssText);
 css.appendChild(style);

 return document[elem].appendChild(css);
};

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