Invalid state when running demo from codepen.io

[slifin]

https://codepen.io/slifin/pen/erobKm?editors=1111

[muaz-khan]

getScreenId will not work on any iframe. (reason: postMessage limitation)

Screen-Capturing.js? An ifarme must allow video permissions (maybe):

<iframe allow="microphone camera"></iframe> 

So codepen or jsfiddle both need to set above permissions.

You should test screen-capturing.js using github-pages. Github pages supports HTTPs both for free or custom domains.