How Can I Efficiently Restart CSS3 Animations?

Restarting CSS3 Animations: Simplified

In the world of CSS3 animations, it's not uncommon to encounter scenarios where you need to restart an animation on demand. While there are various approaches to achieving this, one that has sparked curiosity is the technique of removing and reinserting the animated element. Although functional, it leaves space for optimization.

A Streamlined Method

Thankfully, there's a more elegant and efficient way to restart CSS3 animations: utilizing reflow to force an update to the element's style. By temporarily removing the animation style, triggering a reflow, and then reinstating the animation, you can effectively reset it without introducing unnecessary complexity.

Practical Implementation

Here's a JavaScript function that demonstrates this approach:

function reset_animation() {
  var el = document.getElementById('animated');
  el.style.animation = 'none';
  el.offsetHeight; /* trigger reflow */
  el.style.animation = null; 
}

Accompanying this function, define CSS rules for the animated element and a keyframe animation, as illustrated below:

#animated {
  position: absolute;
  top: 70px;
  width: 50px; height: 50px;
  background-color: black;
  animation: bounce 3s ease-in-out infinite;
}
@keyframes bounce {
  0% { left: 0; }
  50% { left: calc( 100% - 50px ); }
  100% { left: 0; }
}

Finally, include the HTML markup:

<div>

This approach effectively restarts the animation whenever you click the "Reset" button, without the need for complex timeouts or element manipulation.

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