Using Samsung Note9 Chrome lastest on github page.
Change phone into landscape mode and try the url example, you will see no copyright at the bottom, try in portrait and you do.
I believe this to be because the address bar on mobile reduces available height but window height includes adressbar space. In landscape mode there is no extra margin so the URL example page gets truncated by that amount.
Using Samsung Note9 Chrome lastest on github page. Change phone into landscape mode and try the url example, you will see no copyright at the bottom, try in portrait and you do.
I believe this to be because the address bar on mobile reduces available height but window height includes adressbar space. In landscape mode there is no extra margin so the URL example page gets truncated by that amount.