Expand to full screen not working

I’m wondering what happened between today and y’day. The frame on the videos looks different. Y’day you could go to full screen by tapping the arrows in the top left corner. Today the frame looks just like a YouTube frame with the full screen icon in the bottom right corner. Every time I tap the full screen icon I get an error message “your browser does not support full screen”. Tried Google and Safari on my iPad, same error message on both. For me this is a critical feature on the website. Help! PS the 15 sec rewind and fast forward are missing too!