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<!DOCTYPE html> <html> <head> <style> #myDIV { height: 250px; width: 400px; padding: 10px; margin: 15px; border-left: 10px solid red; background-color: lightblue; direction: rtl; overflow: scroll; } </style> </head> <body> <p>Click the button to get the width of the div's left border, in pixels.</p> <button onclick="myFunction()">Try it</button> <div id="myDIV"> The text direction of this div is right-to-left.<br> And it has a scrollbar! <p id="demo"></p> </div> <script> function myFunction() { var left = document.getElementById("myDIV").clientLeft; document.getElementById("demo").innerHTML = "Border left width: " + left + "px"; } </script> </body> </html>