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<!DOCTYPE html> <html> <head> <style> #test { top: 100px; margin: 10px; padding: 10px; width: 300px; position: relative; border: 5px solid black } </style> </head> <body> <div id="test"> <p>Click the button to get offsetTop for the test div.</p> <p><button onclick="myFunction()">Try it</button></p> <p>offsetTop is: <span id="demo"></span></p> </div> <script> function myFunction() { var testDiv = document.getElementById("test"); document.getElementById("demo").innerHTML = testDiv.offsetTop; } </script> </body> </html>