CSS transition-behavior property

[josepharhar]

Request for position on an emerging web specification

Information about the specification

• Title: CSS transition-behavior property
• URL: https://drafts.csswg.org/css-transitions-2/#transition-behavior-property
• Explainer (if not README.md in the repository): none

Design reviews and vendor positions

• TAG Design Review: Transitions on specified discrete properties w3ctag/design-reviews#825
• Mozilla standards-positions issue: Transitions on specified discrete properties mozilla/standards-positions#763

Bugs tracking this feature

• WebKit Bugzilla:
• Radar:

Anything else we need to know

The transition-behavior property enables transitions for discrete properties when the allow-discrete value is used. Discrete properties will transition from their initial to final value at 50% through the transition, unless one of the values is display:none or content-visibility:hidden, in which case the not-invisible value will be used for the entire duration of the transition.

CSSWG issue: w3c/csswg-drafts#8857

[gsnedders]

cc @graouts

[nt1m]

I will mark this as position: support one week from now pending objections, given we have implemented this in WebKit:

• WebKit/WebKit@a0f7f0b
• WebKit/WebKit@336b9f9