JavaScript DHTML/Style Layout/getClientRects
"getClientRects()" Example
<html>
<body>
<button onclick="alert(this.getClientRects().length);">Client Rect</button>
</body>
</html>
<html>
<body>
<button onclick="alert(this.getClientRects().length);">Client Rect</button>
</body>
</html>