Hi there,
CodePen seems to have a problem when open some of the Pens in a new Tab (inactive tabs) - animation won't start in that Pen. You need to manually refresh Tab or open console to make animation start. This only happens in Chrome and new Edge Browser (in Firefox everything working normally) and only occurs when Pen opens in a new tab.
It happens very often in Pens with PIXI.JS or sometimes when using gsap.
The very annoying issue when surfing on CodePen main page and try to open more Pens on new Tab.
Here's some examples (my Pens with PIXI.js) -> try to open in new Tab and wait a few seconds before access that tab:
https://codepen.io/isladjan/pen/mdeXepz
https://codepen.io/isladjan/pen/rNOqOqZ
https://codepen.io/isladjan/pen/abddjNb
I try a few quick fixes, but they don't seem to work. Did anyone else face this issue? Can someone please help me with it?