JavaScript – Change the Font Size of Div

To change the font size of a div using JavaScript, get reference to the div element, and assign required font size value to the property.


<!DOCTYPE html>
<html lang="en">
<meta charset="utf-8">
    <h2>Change Font Size for Div in JavaScript</h2>
    <div id="myDiv">
        <p>This is a paragraph in Div.</p>
        <span>This is a span in Div.</span>
    <button type="button" onclick="changeStyle()">Click Me</button>
    function changeStyle(){
        var element = document.getElementById("myDiv"); = "20px";
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In this JavaScript Tutorial, we learned how to change the font size of a div using JavaScript.