Please add a way to toggle a widget to nearly fullscreen

Suggestion: Add an expand/contract button (for media over 700px) or pop out/pop in button (like Gmail does with emails) that can toggle a widget to nearly fullscreen. Alternately, give a button to “pop out” the chat to a new fullscreen item. It could look something like this on desktop (hacked via CSS):

The iFrame embed code seems to give the option of defining an internal width, but I don’t see such a custom option for widgets. We could override the default width via CSS, but that is fragile and not dynamic.