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<!DOCTYPE html> <html> <body> <p id="myP" style="border-top: 5px solid red;">Click the button to get the value of my top border.</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("myP").style.borderTop; document.getElementById("demo").innerHTML = x; } </script> </body> </html>