×

Save Your Code

If you click the save button, your code will be saved, and you get an URL you can share with others.

By clicking the "Save" button you agree to our terms and conditions.

Report Error

×

Save to Google Drive

If you have a Google account, you can save this code to your Google Drive.

Google will ask you to confirm Google Drive access.

×

Open from Google Drive

If you have saved a file to Google Drive, you can open it here:

Result Size: 625 x 571
×
Change Orientation Save Code Save to Google DriveSave to Google Drive Load from Google DriveLoad from Google Drive Change Theme, Dark/Light
​x
 
<!DOCTYPE html>
<html>
<title>W3.JS</title>
<style>
.marked {
    background-color: orange;
    font-size: 20px;
    padding: 16px;
    color: white;
}
</style>
<script src="../lib/w3.js"></script>
<body>
​
<h2>Testing W3.JS in HTML</h2>
​
<p>Click the button to add class='marked' to all elements with class='city'.</p>
​
<p><button onclick="w3.addClass('.city','marked')">Add Class</button></p>
​
<div id="London" class="city">
  <h2>London</h2>
  <p>London is the capital city of England.</p>
</div>
<br>
<div id="Paris" class="city">
  <h2>Paris</h2>
  <p>Paris is the capital of France.</p> 
</div>
<br>
<div id="Tokyo" class="city">
  <h2>Tokyo</h2>
  <p>Tokyo is the capital of Japan.</p>
</div>
​
</body>
​
<!-- Mirrored from www.w3schools.com/w3js/tryit.asp?filename=tryw3js_add_class_class by HTTrack Website Copier/3.x [XR&CO'2014], Wed, 05 Jun 2019 13:06:45 GMT -->
</html>
​
×

Report a Problem: