Web Animations API

Utilizing the Web Animations API Effectively

Now that we've explored what the Web Animations API is, its benefits, why to choose it, when to use it, and the problems it solves, let's dive into how to effectively employ this API to bring your web designs to life.

Basic Animation with Web Animations API

Creating a basic animation with the Web Animations API involves defining the animation's keyframes, specifying the target element, and configuring the animation options. Here's a simplified example of animating an element's opacity:
// Get the target element
const element = document.querySelector('.animated-element');

// Define keyframes for the animation
const keyframes = [
  { opacity: 0, offset: 0 },
  { opacity: 1, offset: 1 },

// Configure animation options
const options = {
  duration: 1000, // Animation duration in milliseconds
  easing: 'ease-in-out', // Timing function for the animation
  delay: 0, // Delay before starting the animation
  iterations: 1, // Number of times to repeat the animation
  fill: 'forwards', // Animation fill mode

// Create and play the animation
const animation = element.animate(keyframes, options);

// Optional: Handle animation events
animation.onfinish = () => {
  // Animation has finished
  console.log('Animation finished');

In this example:

  • We select the target element to animate.
  • Keyframes are defined to specify how the property (opacity) changes over time.
  • Animation options, such as duration and easing, are set to control the animation's behavior.
  • The animate() method creates and plays the animation.

Complex Animations and Sequences

For more complex animations and sequences, you can chain multiple animations together using promises and async/await. Here's an example of chaining animations:

async function animateSequence() {
  const element = document.querySelector('.animated-element');
  const animation1 = element.animate(
    { opacity: [0, 1], transform: ['scale(0)', 'scale(1)'] },
    { duration: 1000, easing: 'ease-in-out' }
  await animation1.finished; // Wait for the first animation to finish
  const animation2 = element.animate(
    { opacity: [1, 0], transform: ['scale(1)', 'scale(0)'] },
    { duration: 1000, easing: 'ease-in-out' }
  await animation2.finished; // Wait for the second animation to finish


In this code:

  • We create two animations with different keyframes and options.
  • We use await to pause execution until each animation finishes.

Controlling and Managing Animations

The Web Animations API also provides methods for controlling and managing animations. For instance, you can pause, resume, or cancel an animation. Here's an example of how to pause and resume an animation:

const element = document.querySelector('.animated-element');
const animation = element.animate(
  { opacity: [0, 1] },
  { duration: 1000, easing: 'ease-in-out' }

element.addEventListener('click', () => {
  if (animation.playState === 'running') {
  } else {

In this example, clicking on the element toggles between pausing and resuming the animation.


The Web Animations API empowers web developers to create captivating and interactive animations that enhance the user experience on websites and web applications. By mastering this API, you can craft animations ranging from simple transitions to complex sequences, adding a dynamic and engaging dimension to your web designs. Whether you're animating user interfaces, adding visual effects, or creating interactive storytelling elements, the Web Animations API provides the tools you need to bring your creative ideas to life on the web.

Practice Your Knowledge

What functionalities does the JavaScript Animation API offer?

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