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How to remove CSS property using JavaScript?

JavaScript | removing CSS property: Here, we are going to learn how to remove CSS property using JavaScript?
Submitted by Siddhant Verma, on January 21, 2020

In this article, we'll see how we can remove a CSS property from a certain element using JavaScript? We can remove only those properties that we assign ourselves and the pre-default ones cannot be removed by this method.

HTML:

<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Removing CSS property</title>
    <!-- Compiled and minified CSS -->
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/materialize/1.0.0/css/materialize.min.css">
    <!-- Compiled and minified JavaScript -->
    <script src="https://cdnjs.cloudflare.com/ajax/libs/materialize/1.0.0/js/materialize.min.js"></script>

</head>
<style>
    body {
        background: silver;
    }
    
    h2 {
        background: wheat;
        padding: 10px;
    }
    
    .btn {
        background: tomato;
    }
    
    .text {
        font-weight: 500;
    }
</style>

<body>
    <div class="container">
        <h2>Let's remove some css!</h2>
        <div class="container">
            <button class="btn">Just a random button!</button>
            <p class="text">Lorem ipsum, dolor sit amet consectetur adipisicing elit. Tempora quis asperiores dicta quos laborum laboriosam perferendis ab veniam odit saepe, obcaecati officiis iure iste voluptates at quod commodi cupiditate voluptas!</p>
        </div>
    </div>
</body>
<script>
</script>

</html>

Output

remove CSS property using JavaScript (1)

Code to remove CSS property using JavaScript

We can call on a certain DOM selector's style property and use the remove property method to remove that particular CSS property. First, let's get a reference to all the DOM elements.

<script>
	const heading = document.querySelector('h2');
	const button = document.querySelector('.btn');
	const para = document.querySelector('.text');
</script>

Example 1

Now let's try to remove the background property from our heading,

heading.style.removeProperty("background");

Example 2

Oops! That didn't quite work, did it? There's a simple explanation. We are loading our scripts when our whole page loads and the styles are written inside our stylesheet. Even if we remove a certain property using JavaScript, it wouldn't make any difference since that DOM element is also hooked to a stylesheet and we aren't removing any kind of CSS that we have written. Let's refactor our code a little bit now, let's clear out styles and apply those styles using JavaScript,

<style>
/* body{
    background: silver;
  }
  h2{
    background: wheat;
    padding: 10px;
  }
  .btn{
    background: tomato;
  }
  .text{
    font-weight: 500;
  } */

</style>

Output

remove CSS property using JavaScript (2)

Example 3

As you can see now all our styles are removed. Let's add them back in our JavaScript,

<script>
	const heading = document.querySelector('h2');
	const button = document.querySelector('.btn');
	const para = document.querySelector('.text');
	heading.style.background = "wheat";
	heading.style.padding = "10px";
	document.querySelector('body').style.background = "silver";
	button.style.background = "tomato";
	para.style.fontWeight = "500";
</script>

Output

remove CSS property using JavaScript (3)

Example 4

And we have our styles back! Great. Now let's try removing them using our JavaScript,

heading.style.removeProperty("background");

Output

remove CSS property using JavaScript (4)

Example 5

Our heading no longer has a wheat background! Great. Let's remove all the CSS properties inside a function and see if we get back the same unstyled page.

function removeProperties() {
  document.querySelector('body').style.removeProperty("background");
  heading.style.removeProperty("background");
  heading.style.removeProperty("padding");
  button.style.removeProperty("background");
  para.style.removeProperty("fontWeight");
}

Output

remove CSS property using JavaScript (5)

Example 6

Everything should remain the same as we have not yet called or invoked our function so let's do it now inside our console,

    removeProperties();

Output

remove CSS property using JavaScript (6)

Voila! We have successfully removed all our CSS properties using JavaScript! Can you check for yourself is this method works for inline styles?

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