Tryit Editor v2.9

Edit This Code:
<!DOCTYPE html>
<html>
<body>

<p id="myP" contenteditable="true">Try to change this text.</p>

<button onclick="myFunction(this);">Disable content of p to be editable!</button>

<p id="demo"></p>

<script>
function myFunction(button) {
    var x = document.getElementById("myP");
    if (x.contentEditable == "true") {
        x.contentEditable = "false";
        button.innerHTML = "Enable content of p to be editable!";
    } else {
        x.contentEditable = "true";
        button.innerHTML = "Disable content of p to be editable!";
    }
}
</script>

</body>
</html>