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<!DOCTYPE html> <html> <head> <style> #myDIV { height: 250px; width: 400px; padding: 10px; margin: 15px; border-top: 15px solid black; border-left: 10px solid red; background-color: lightblue; } </style> </head> <body> <p>Click the button to get the width of the div's top and left border, in pixels.</p> <button onclick="myFunction()">Try it</button> <div id="myDIV"> <p id="demo"></p> </div> <script> function myFunction() { var elmnt = document.getElementById("myDIV"); var txt = "Border top width: " + elmnt.clientTop + "px<br>"; txt += "Border left width: " + elmnt.clientLeft + "px"; document.getElementById("demo").innerHTML = txt; } </script> </body> </html>