Allow transition-delay to affect non-animatable properties

• Component: CSS
• Status: NEW ---

[Simon Fraser (smfr)]

It has been suggested that non-animatable properties should respect transition-delay, to allow the author to control when they change.

[Chris Marrin]

So, if you want an image to change after a period of time the logical thing to do would be to go:

transition-property: background-image;
transition-delay: 2s

But this won't work since you need a transition-duration. Seems like the better model would be to use a step function and set the transition up like any other property. Then all non-animatable properties would always use a step timing-function, either implicit or explicit. Then you'd set it up like this:

transition-property: background-image;
transition-duration: 2s;
transition-timing-function: step-end;

(I don't remember the step function syntax, but you get the idea).

I think this makes more sense and I think it would be easier to integrate this with other transitions.

[Chris Marrin]

So maybe a better title for this bug is "Allow non-animatable properties to animate with step timing-function"?

[Simon Fraser (smfr)]

Or we still respect the delay even if the duration is zero?

[Dean Jackson]

*** Bug 65488 has been marked as a duplicate of this bug. ***