1756765 - Check if the elapsedTime is correct for animationiteration events

Status: RESOLVED INVALID

(Core :: CSS Transitions and Animations, task)

Description

[Florian Quèze [:florian]]

See https://phabricator.services.mozilla.com/D139105#4548684

Comment 1

[Brian Birtles (:birtles)]

Latest spec text is here: https://drafts.csswg.org/css-animations-2/#event-dispatch

You won't get a zero elapsedTime for the first iteration because the "current iteration" will be 1 at the point when the first iteration event is dispatched.

Test case here: https://codepen.io/birtles/pen/PoOaabJ

I think the confusion may have been around the "iterationStartTime" which is not the time of the current iteration but the time produced by the iteration start property which lets you start at a given iteration or part-way through one: https://drafts.csswg.org/web-animations-1/#iteration-start

Comment 2

[Brian Birtles (:birtles)]

This seems to be based on a misunderstanding of the value of current iteration at the point when the iteration events are dispatched. Closing as invalid but please let me know if I've misunderstood.