the animation is stopped when i switch the window tab many times

[JE-lee]

Your system information

• VelocityJS version: 2.0.5
• Browser: 72.0.3626.121（32 位）
• Operating System: windows 10

Checklist

• Is this an issue with code?: No
• Is this an issue with documentation?: No
• Have you reproduced this in other browsers?: Yes
• Have you checked for updates?:Yes
• Have you checked for similar open issues?: Yes

Please describe your issue in as much detail as possible:

I have a series of animations to excute, so it may take a couple of time。
when the animation is executing, if i switch the window tab to make the current site invisible,
the animation is stoped。
and then it can't resume at every time when i return the site。
(sometimes it can resume ,but not every time)

JSFiddle example showing issue in action (code):

https://codepen.io/je-lee/pen/WmgaNz

Go to https://jsfiddle.net/Rycochet/mqv9L27u/ - click the "Fork" button at the top, create the example and copy the new URL back here.

[Rycochet]

I've had a quick look through your code, and not sure what's going on - but Velocity should behave properly in the background - the result from a Velocity call is also a Promise, so you could actually use them rather than manually creating a Promise - but I'm not sure why that's not working right for you - and can't seem to reproduce it here where it's worked every time (and even finishes in the background etc).