The animation on tabs is wrong

[tleunen]

Sometimes (quite often actually), the animation on the tab bar is not correct. Most the the times, the blue underline appear, quickly disappear and re-appear with the animation.

[filippomartini]

They're working on it (I hope) :)
#954

[tleunen]

Damn I searched before but could not find any issue of it...
Thanks!
Anyway, the other ticket suggests to refactor the anim to match the "siblings anim" in the spec (which I agree).

[Garbee]

Closing as duplicate of #954.

[zcyzcy88]

I write more detail to express OP's mind

What are the steps to reproduce the bug? What is the actual behavior?

This is the slow down GIF:

1. Mouse up, wait the browser react
2. The underline showed suddenly
3. The underline animating

What is the expected behavior?

When I mouse up, The underline start to animate immediately, no showed suddenly

Any other information you believe would be useful?

There is a 0.01s delay in CSS, write by #311

[Garbee]

Oh wow, the gif slowdown makes it much clearer as to what is happening. I thought this was just an issue about it not being by-the-spec example animation. Thanks for that @zcyzcy88.