RT Adam Argyle
Animate opacity and not a blur() filter.
See it in this demo:
The blur() animation has awkward viewport edge blurring. Opacity animation doesn't.
Also, the effort level (CPU or GPU usage) of the opacity animation is far less than a filter.
Win. Win.
https://codepen.io/argyleink/pen/eYyawqx

https://twitter.com/argyleink/status/1518631371761147905