Explanation:
F11 toggles full screen, and Ctrl + D bookmarks the current page.

ALSO KNOW (related points):
• In Safari on macOS, what must be done before the Web Inspector is available? → Enable the Develop menu (in Settings → Advanced)
• Which shortcut toggles the device (responsive design) mode in Chrome or Firefox DevTools? → Ctrl + Shift + M
• Which shortcut shows a page's source code in most desktop browsers? → Ctrl + U
• Which internal page shows Firefox's advanced configuration preferences? → about:config
• Which shortcut reopens the last closed tab in Chrome, Edge, and Firefox? → Ctrl + Shift + T
• Which shortcut opens a private window in Firefox? → Ctrl + Shift + P
• Which shortcut opens browser history in Chrome, Edge, and Firefox? → Ctrl + H