<!DOCTYPE html>
<html lang="en-US">
<body>
<p>Hello <span>Span</span></p>
<p>Click on the button to display the css value (width, height, etc,.) of span relative to the viewport.</p>
<button onclick="myFunction()">Click Me</button>
<p id="point"></p>
<script>
var x = document.getElementById("point");
var elem = document.getElementsByTagName("span")[0];
function myFunction(){
var rect = elem.getClientRects()[0];
var txt = "";
txt += "<br>Width : " +rect.width;
txt += "<br>Height : " +rect.height;
txt += "<br>From Left : " +rect.left;
txt += "<br>From Right : " +rect.right;
txt += "<br>From Top : " +rect.top;
txt += "<br>From Bottom : " +rect.bottom;
x.innerHTML = txt;
}
</script> </body>
</html>