Translucent borders

dabblet.css

/**
 * Translucent borders
 */

body {
	background: url('http://csssecrets.io/images/stone-art.jpg');
}

div {
	border: 10px solid hsla(0,0%,100%,.5);
	background: white;
	background-clip: padding-box;
	
	/* styling */
	max-width: 20em;
	padding: 2em;
	margin: 2em auto 0;
	font: 100%/1.5 sans-serif;
}

dabblet.html

<div>
Can I haz semi-transparent borders?
Pretty please?
</div>

dabblet.js

alert('Hello world!');

settings.json

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