After effects drop shadow size3/24/2024 That’s certainly a lot of CSS to achieve the same effect as simply animating box-shadow, just with improved performance. This is the critical difference between the two techniques, stripping out all of the other layout styles: We minimize the amount of repaints (and work that your browser has to do) by sticking to only changing these two properties during the animation. Why are we seeing this effect? There are very few CSS properties that can be animated without constantly triggering repaints for every frame, namely opacity and transform. There are clearly more re-paints when hovering the cards on the left side (animating box-shadow), compared to hovering the cards on the right side (which animate the opacity of their pseudo-element). If you bring up your developer tools and hover one of these items, you should see something similar to this (green bars are paints less is better): On the left we’re animating box-shadow on hover, and on the right we’re adding a pseudo-element with :after, applying the shadow to that, and animating the opacity of that element. The only difference is how we apply and animate the shadow. If the two examples look the same to you, that’s the point. Have a look at the demo and compare the two different techniques we’ll be exploring. There’s an easy way of mimicking the same effect, however, with minimal re-paints, that should let your animations run at a solid 60 FPS: animate the opacity of a pseudo-element. Animating a change of box-shadow will hurt performance. How do you animate the box-shadow property in CSS without causing re-paints on every frame, and heavily impacting the performance of your page? Short answer: you don’t.
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