F11 changes the browser view to "full screen".
Holding it down just pointlessly switched between normal view and full view on the browser.
Other functions depends on the program that you are running while pressing F11. Be more specific by mentioning which program in your next question.
Click on the address bar and then press F11.
F11
mac: join a level, press the button under esc, type is $testcheats=1; then hold down fn and press f11. then you edit levels. pc: join a level, press f10, type in $testcheats=1; then press f11. then you can edit levels. have fun!!
Press "f11"
F11
control+shift+f11
press F11
Press F11
You press F11
Ctrl + F11 = Toolbar
f11
Press f11 to make youre screen go into fullscreen, press f11 to take it off full screen