Transition completes too early when using browser animation tab #14112
Description
Version
3.6.0-alpha.4
Reproduction link
Steps to reproduce
Open dev tools and navigate to the "animation" tab. If it's not part of the tab group above, you'll have to find it in the additional tools. There you can slow down animations on a global level, (100%, 25%, 10%). After that, simply press the toggle button to make the box appear and disappear.
What is expected?
No matter what the animation speed is, it should execute normally and disappear smoothly.
What is actually happening?
It disappears after 500ms, which should not happen when slowed down to 25%. Then it should take four times as much, so two seconds.
I found this when testing a desktop application I made. It uses transitions a LOT, so I had to test them a lot. Not being able to slow down their speed in a quick and simple manner really bugged me, so yeah.