Length Unit mixing fails

[Natim]

If you try to do the following:

Animation.style [ Animation.top (percent 100) ]
    |> Animation.interrupt  [ Animation.to [ Animation.top (px -200) ] ]

Note the (px -200)

It actually goes to (percent -200)

[Natim]

In this case the solution I had in mind was to go to 0% and then switch to pixels.

But then you need a way to guess how many pixels might your 15% be.

            Animation.style [ Animation.top (percent 100) ]
                |> Animation.interrupt
                    [ Animation.loop
                        [ Animation.toWith (Animation.speed { perSecond = 15 })
                            [ Animation.top (percent 0) ]
                        , Animation.set [ Animation.top (px 0) ]
                        , Animation.toWith (Animation.speed { perSecond = 150 })
                            [ Animation.top (px -250) ]
                        , Animation.set [ Animation.top (percent 100) ]
                        ]
                    ]