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dabblet.css

.box{
	width: 400px;
	height: 200px;
	background: darkblue;
	margin: 4em auto 0;
}

.shadow{
	box-shadow: 0 0 4px 5px rgba(0,0,0,.8);
}

.lt-ie9 .shadow{
	border: solid 3px rgba(0,0,0,.8);
}

dabblet.html

<div class="box shadow"></div>

dabblet.js

// alert('Hello world!');

settings.json

{"view":"split","fontsize":"100","seethrough":"","prefixfree":"1","page":"css"}