Answer 1

@Omid Jashni wrote: << window.requestAnimationFrame() has same result as requestAnimationFrame() for me. >>

Logical, as the window object is the object containing the global variable scope ;)

@Omid Jashni wrote: << Just works in the web version of Sololearn not in app and i don't know why!!? >>

In app, some functionnalities of JS are disabled, and in web views in general, some functionnalities are more or less supported, depending of the browser and the engines used for interpreting/parsing Html, Css, JS ^^

Anyway, it seems to be already reported as an issue:
https://issuetracker.google.com/issues/36972329

Answer 2

works for me

Answer 3

nice

you mind adding [SOLVED] to the title of the question?

Answer 4

try

window.requestAnimationFrame()

Answer 5

I always use window.requestAnimationFrame()

as i read it from

https://developer.mozilla.org/en-US/docs/Web/API/window/requestAnimationFrame