When I used the "fullscreen" action in the viewer embed, I found myself looking for a way to exit the fullscreen mode. Not having any button in the UI confused me until I realized that the "fullscreen" action opens a new tab, not a fullscreen element of the page I'm on.
I can imagine a few possible solutions:
Change the link from a 'fullscreen' icon to a 'new tab' icon.
A button in the full-screen embed UI for 'exit fullscreen' — the visibility of which could be controlled by a query arg or a cookie — that closes the tab.
Supporting two viewer embed actions: Open in new tab and View fullscreen. Right now the two are implicitly linked and could be explicitly separated into two controls.
When I used the "fullscreen" action in the viewer embed, I found myself looking for a way to exit the fullscreen mode. Not having any button in the UI confused me until I realized that the "fullscreen" action opens a new tab, not a fullscreen element of the page I'm on.
I can imagine a few possible solutions: