Need to update Unreal Engine Web Browser plugin
Because its way too old and most of current website’s not working on Android and IOS devices.
if you guys improve your web browser plugin then it will help us greatly!
Please focus on this plugin 
:
this question directly references to this question:
https://forums.unrealengine.com/t/how-to-play-youtube-video-on-widget-on-level/642669