I develop a website who is using https://github.com/sindresorhus/screenfull.js/ for full-screen mode. On Chrome, Firefox, Open, and Safari the plugin it works properly. But when I go to Internet Explorer 10+ the plugin doesn't work properly. So when I'm in full-screen mode I can not scroll the content even with the keyboard.

I tried to add overflow: scroll !important; overflow-y: scroll !important; to the body but without changes.

Can you please help me? Thank you in advance.

I doubt MSFT will fix this as they are on IE11 now.

If you check on https://caniuse.com/#feat=fullscreen it shows that IE10 doesn't support the Fullscreen API, so you're not going to win - your best bet is to try to find a polyfill or shim which will allow you to emulate that functionality on older browsers.