Now in Baseline: animating entry effects

New CSS features, @starting-style and transition-behavior: allow-discrete, are now available in Firefox 129. These features enable entry animations for elements, even those animating from display: none, enhancing the capability to animate elements into the top layer. The @starting-style rule sets initial styles, while allow-discrete supports the animation of properties that don’t interpolate between values, such as display and visibility. Example CSS is provided to demonstrate how these features can be applied.