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CSS Transitions and Animations

 

CSS Transitions and Animations bring life and interactivity to your web pages by allowing you to smoothly change property values over time. They enhance user experience by providing visual feedback and engaging effects without the need for JavaScript.

CSS Transitions

Transitions let you change CSS property values gradually, rather than instantly, when a state changes — like when a user hovers over a button.

Key Properties:

·         transition-property — Which CSS properties will animate (e.g., background-color, width).

·         transition-duration — How long the transition lasts (e.g., 0.3s).

·         transition-timing-function — The speed curve of the transition (e.g., ease, linear, ease-in-out).

·         transition-delay — Delay before the transition starts.

Example:

button {
  background-color: blue;
  transition: background-color 0.3s ease;
}
 
button:hover {
  background-color: green;
}

When the user hovers over the button, its background color smoothly changes from blue to green over 0.3 seconds.


CSS Animations

Animations allow more complex sequences of property changes, defined by keyframes that specify styles at various points in the animation timeline.

Key Properties:

·         @keyframes — Defines the stages of the animation.

·         animation-name — Specifies the name of the keyframes to apply.

·         animation-duration — How long one cycle of the animation lasts.

·         animation-iteration-count — How many times the animation runs (infinite for endless).

·         animation-timing-function — The speed curve of the animation.

·         animation-delay — Time before the animation starts.

·         animation-fill-mode — Controls how styles apply before and after animation.

Example:

@keyframes slideIn {
  from {
    transform: translateX(-100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}
 
.box {
  animation-name: slideIn;
  animation-duration: 1s;
  animation-timing-function: ease-out;
}

This animation slides the .box element in from the left while fading it in.


Tips for Using Transitions and Animations

·         Use subtle animations to improve UX without overwhelming users.

·         Combine animations with JavaScript for interactive effects.

·         Be mindful of performance—avoid animating expensive properties like box-shadow or width too often.

·         Use will-change sparingly to optimize rendering for animated elements.

 

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