Transitions on specified discrete properties

[josepharhar]

Request for Mozilla Position on an Emerging Web Specification

• Specification Title: Transitions on specified discrete properties
• Specification or proposal URL (if available): [css-transitions-2] Start transitions on discrete animation types w3c/csswg-drafts#4441
• Explainer URL (if available): [css-transitions-2] Start transitions on discrete animation types w3c/csswg-drafts#4441 (comment)
• Caniuse.com URL (optional): none
• Bugzilla URL (optional): none
• Mozillians who can provide input (optional): none

Other information

• Tag review: Transitions on specified discrete properties w3ctag/design-reviews#825
• WebKit standards position: CSS transition-behavior property WebKit/standards-positions#148

Allows transitions of discrete properties to be started on properties explicitly listed in the transition-property list. These transitions run using the same logic as an animation on those properties performing a flip at 50% by default but can be customized through the use of the transitionstart event and web-animations-1 APIs for modifying transition animations.

[zcorpan]

@dholbert @emilio thoughts?

[dholbert]

Yeah, this is just a spec-change, already discussed & resolved-on in the CSSWG, no objections from us. We have https://bugzilla.mozilla.org/show_bug.cgi?id=1805727

I don't think it needs a standards-position issue. If we run into concerns when implementing this or thinking about it, we'll bring them up as csswg issues.