Tryit Editor v2.9

Edit This Code:
<!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>