Re: [css-transitions] interpolating animation of the 'order' property

On Fri, Mar 25, 2016 at 11:35 AM, Jared Wein <> wrote:
> The flex spec introduced the 'order' property as an animatable property.
> This is supported and implemented in Gecko, but the implementation doesn't
> interpolate the position of the element that is moving.
> In the CSS Grid implementation, elements moved via a transition on the
> 'order' property jump from grid-area to grid-area. It would be ideal if we
> could "slide" the elements instead of jumping them.
> See for a reduced
> testcase.
> What are some complicated cases that make this a fundamentally hard problem?

The fundamentally hard part is right in the basic case - the order
property has a specific meaning, and no part of that can be
interpreted as "position these elements so they partially overlap", or
are otherwise flying between the positions they'd occupy at integer

I spent some time 2 or 3 years ago trying to work out "layout
transitions" to handle this, along with my peers at Chrome, and it's a
super-hard problem to make work correctly and efficiently.


Received on Sunday, 27 March 2016 22:51:31 UTC