Display and content-visibility animations #762

Request for Mozilla Position on an Emerging Web Specification

• Specification Title: Display and content-visibility animations
• Specification or proposal URL (if available): [css-display] Why is display listed as not animatable instead of animation type: discrete? w3c/csswg-drafts#6429
• Explainer URL (if available): [css-display] Why is display listed as not animatable instead of animation type: discrete? w3c/csswg-drafts#6429 (comment)
• Caniuse.com URL (optional): none
• Bugzilla URL (optional): none
• Mozillians who can provide input (optional): none

Other information

• TAG review: Display and content-visibility animations w3ctag/design-reviews#824
• WebKit standards position: Display and content-visibility animations WebKit/standards-positions#147

Support specifying display and content-visibility in animations. This support allows for developers to create exit animations after which the element automatically becomes display: none or content-visibility: hidden without needing to write any javascript to handle that switch after the animation is finished. This allows exit animations for elements to be added purely in CSS.