We can achieve dynamic content change and dynamic style changes with use of Javascript DOM
Javascript DOM is used to dynamically change content inside a webpage. Here is a simple script that provide to change of font size along with font family, size, style and color
<html>
<head>
<script>
function displayResults()
{
document.getElementById("p1").style.fontFamily="Helvetica";
document.getElementById("p1").style.fontStyle="oblique";
document.getElementById("p1").style.fontSize="xx-large";
document.getElementById("p1").style.color="Red";
}
</script>
</head>
<body>
<p id="p1">This text is going to change 
</p>
<br>
<button type="button" onclick="displayResults()">Change Font Style, Familym Color and Size</button>
</body>
</html>
