Javascript Can Change HTML Content of A web Page. Code:


<!DOCTYPE html>
<html>
<body>

<h2>What Can JavaScript Do?</h2>

<p id="demo">JavaScript can change HTML content.</p>

<button type="button" onclick='document.getElementById("demo").innerHTML = "Hello JavaScript!"'>Click Me!</button>

</body>
</html>

Code Description: 

JavaScript Can Change HTML Content
One of many JavaScript HTML methods is getElementById().
The example above "finds" an HTML element (with id="demo"), 
and changes the element content (innerHTML) to "Hello JavaScript":

Code OUTPUT:

What Can JavaScript Do?

JavaScript can change HTML content.