Svelte Transitions and Animations: A Comprehensive Guide

Svelte Transitions and Animations: A Comprehensive Guide


Svelte is a modern JavaScript framework for building user interfaces. One of the standout features of Svelte is its built-in transitions and animations. This guide will provide a comprehensive overview of how to use these features to create dynamic and engaging web applications.

Importance in Web Development

In the world of web development, user experience is paramount. Transitions and animations can make your application feel more interactive and responsive, leading to a better user experience. Svelte’s transitions and animations are declarative, efficient, and easy to use, making them a powerful tool for developers.

Detailed Explanation


In Svelte, transitions are functions that gradually change the CSS properties of an element over time. They are applied when elements enter or leave the DOM. Svelte provides several built-in transition functions, such as fade, slide, fly, draw, and scale.

  import { fade } from 'svelte/transition';

<div transition:fade>
  Hello, world!


Animations in Svelte are similar to transitions, but they run continuously while an element is in the DOM, rather than only when it enters or leaves. Svelte provides a tick function for creating custom animations.

  import { tick } from 'svelte';
  let t = 0;
  tick().then(() => {
    const interval = setInterval(() => {
      t += 0.01;
      if (t >= 1) clearInterval(interval);
    }, 16);

<div style="opacity: {t}">
  Hello, world!

Best Practices

When working with Svelte transitions and animations, keep the following best practices in mind:

  • Use transitions sparingly: While transitions can enhance your application, too many can be distracting.

  • Test on multiple devices: Ensure your transitions and animations perform well across different devices and screen sizes.

  • Customize transitions: Svelte allows you to customize transition duration, delay, easing, and more. Take advantage of these options to create unique effects.


Svelte’s transitions and animations are a powerful tool for enhancing the user experience of your web applications. They are easy to use, efficient, and customizable, making them a valuable addition to any Svelte developer’s toolkit. Whether you’re creating subtle transitions or complex animations, Svelte has you covered. Happy coding!