Science Knowings: JavaScript Course For Social Media

CSS Transitions

CSS Transitions

Welcome back! In this session, we'll dive into CSS Transitions, a powerful tool for adding smooth animations to your web pages.

Introduction to Transitions

CSS Transitions allow you to gradually change the style of an element over a specified duration. They create a more fluid and engaging user experience.

Why Use Transitions?

Transitions enhance the user experience by:

  • Smoothing out changes in element appearance
  • Indicating changes in state (e.g., hover effects)
  • Creating visual feedback (e.g., loading animations)

Syntax & CSS Properties

The transition property accepts a list of CSS properties to be animated, followed by their duration and timing function.

transition: property duration timing-function;

Timing Functions

Timing functions control the pace of the transition. Common options include:

  • linear: Constant speed
  • ease: Slow start and end, faster in the middle
  • ease-in: Slower start
  • ease-out: Slower end

Transition Delays

The transition-delay property specifies a delay before the transition begins.

transition-delay: 1s;

Combining Transitions

Multiple transitions can be applied to an element simultaneously. They will execute in order, creating complex animations.


Transition hooks allow you to trigger JavaScript functions at specific points during the transition.

transition: property duration timing-function !important;

CSS Transition Events

CSS transition events can be used to detect when a transition starts, ends, or iterates.

  • transitionstart
  • transitionend
  • transitionrun

Animating Multiple Properties

Transitions can be applied to multiple CSS properties simultaneously. Use a comma to separate the properties.

transition: color, background-color 2s ease-in-out;

Advanced Concepts: stagger and transition-group

Staggering transitions adds a delay between the start times of multiple transitions. transition-group is a Vue.js component for coordinating transitions on a group of elements.

Browser Support

CSS Transitions are widely supported in modern browsers. Check the Can I Use website for detailed support information.

Practical Use Cases

CSS Transitions can be used for a wide range of effects, including:

  • Hover effects
  • Loading animations
  • Slide-in menus
  • Modal windows
  • Animated scroll effects


CSS Transitions are a powerful tool for adding smooth animations to your web pages. They can enhance the user experience, create visual feedback, and make your pages more engaging.

Next Topic: CSS Animations

In the next session, we'll explore CSS Animations, another powerful tool for creating more complex animations. Follow us to learn how to animate elements along paths, create keyframe animations, and much more!