Tryit Editor v2.9

Edit This Code:

<!DOCTYPE html>
<html>
<body>

<p id="myP">Click the button to give me a red background color.</p>

<button onclick="myFunction()">Try it</button>

<script>
function myFunction() {
    document.getElementById("myP").style.backgroundColor = "red";
}
</script>

</body>
</html>