<html>
<head>
<script>
function myFunction() {
var div = document.getElementById("myDiv");
var rect = div.getBoundingClientRect();
x = rect.left;
y = rect.top;
w = rect.width;
h = rect.height;
alert ("Left: " + x + ", Top: " + y + ", Width: " + w + ", Height: " + h);
}
</script>
</head>
<body>
<div style="height:200px; width:300px; overflow:auto;">
<div id="myDiv" style="width:250px; height:150px; border:1px solid red;">
Return the top-left corner of this element relative to the top left corner of the viewport with the button below.<br>
Also try to use the scrollbars to test the method for different positions.
</div>
<div style="width:1000px; height:1000px;"></div>
</div>
<br>
<button onclick="myFunction()">Get top-left corner + witdth and height of the element with red border</button>
</body>
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</html>