JavaScript – Change the Width of HTML Element

To change the width of a HTML Element using JavaScript, get reference to this HTML Element element, and assign required value to the property.

In the following example, we will change the width of HTML Element with id "myElement" to "150px", in JavaScript, using property.


<!DOCTYPE html>
<html lang="en">
        #myElement {
            border:1px solid #CCC;
    <meta charset="utf-8">
    <h2>Change Width of HTML Element in JavaScript</h2>
    <div id="myElement">Hello World!</div>
    <button type="button" onclick="changeStyle()">Click Me</button>
    function changeStyle(){
        var element = document.getElementById("myElement"); = "150px";
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In this JavaScript Tutorial, we learned how to change the width of a HTML Element using JavaScript.