'offsetWidth' Example
<html> <body> <div id="myDiv" style="position:absolute; left:150; top:100; width:400; height:200; background-color:blue;"> </div> <button onclick="alert(myDiv.offsetHeight);">offsetHeight</button> <button onclick="alert(myDiv.offsetWidth);">offsetWidth</button> <button onclick="alert(myDiv.offsetLeft);">offsetLeft</button> <button onclick="alert(myDiv.offsetTop);">offsetTop</button> </body> </html>