Dissolve
Opacity and contrast settle together, like a film dissolve.
Preview
Tune parameters
Full code
/* Dissolve */
@keyframes dissolve {
from { opacity: 0; filter: contrast(1.8) brightness(1.5); }
to { opacity: 1; filter: contrast(1) brightness(1); }
}
.dissolve { animation: dissolve .8s ease-out both; }