CSS animation-fill-mode

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One overlooked animation property, however, is the animation-fill-mode property. This CSS property sets the state of the end animation when the animation is not running. Here’s a quick example:

@keyframes fadeIn {
  0%   { opacity: 0; }
  100% { opacity: 1; }

.fadeIn {
  animation-name: fadeIn;
  animation-duration: 1s;
  animation-fill-mode: forwards;

In the case of my fadeIn animation, I want the element to stay at an opacity of 1 when the animation is complete. If I don’t set the value to forwards, the element would go back to an opacity of 0 after the animation runs.

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