How would I make videos full screen using the built in Full screen button button on the page and for any page like YouTube or any site that plays videos at all
Sorry for getting late reply 
if you’re using this extension, the function of full screen it depends on your video height, eg if have a video of 16:11 the video can be in full screen with rotation of screen, definitely landscape mode, if you have a video height 9:11 then full screen can work as you’re willing. But I have ever tried all off this method I said, so do check you video height if it’s in 9:11
I am using the WebViewextra extension and in that I want to be able to watch YouTube for example but the fullscreen button at the bottom of the video doesn’t work
Then you posted it in wrong thread 
I recommend you to search, if find none then you can create another topic about your need
Also did you try the YouTube player, since you mentioned it
I don’t know how to use it is the problem. I know it is there but dont know the code to make it work. Also someone from the mit app inventor forum sent me here because I was using this extension.
So what have you tried so far, can you show us
It is confusing what exactly you are talking about… is it about the webviewextra extension? The plyr extension? What did you try?
Taifun
Is YouTube player not working? Am confused
In short can you provide your relevant blocks
You have the aia file? If yes, then import it
Sunny’s CustomWebView allows fullscreen, but it can’t be linked to WebViewExtra.
I am aware that customwebview can but I want to use webviewextra for the fact of the downloading and tabs capabilites
Then try learning
were and how? Ai? some book?