Using CSS 3 new features to create a transparent border triangle

Look at the effect first, before the CSS 3, completely is unthinkable, only pictures can do it, but the HTML 5 and CSS 3, achieve this effect, already very easily.
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Code:

<!DOCTYPE html>
<html>
<head>
<style type='text/css'>
 
/* top */
.arrow-up {
 width: 0;
 height: 0;
 border-left: 20px solid transparent;
 border-right: 20px solid transparent;
 border-bottom: 20px solid green;
}
 
/* bottom */
.arrow-down {
 width: 0;
 height: 0;
 border-left: 20px solid transparent;
 border-right: 20px solid transparent;
 border-top: 20px solid orange;
}
 
/* right */
.arrow-right {
 width: 0;
 height: 0;
 border-top: 60px solid transparent;
 border-bottom: 60px solid transparent;
 border-left: 60px solid blue;
}
 
/* left */
.arrow-left {
 width: 0;
 height: 0;
 border-top: 10px solid transparent;
 border-bottom: 10px solid transparent;
 border-right: 10px solid silver;
}
</style>
</head>
<body>
 <div class="arrow-up"></div>
 <div class="arrow-down"></div>
 <div class="arrow-left"></div>
 <div class="arrow-right"></div>
</body>
</html>

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