Alguns llocs web intenten establir el focus de la finestra del navegador emprant window. focus (). Usualment això permet moure una finestra al davant interrompent d' aquesta manera d' altres accions que puga estar realitzant l' usuari en aquell moment. Aquesta opció especifica el tractament de dits intents.
Some websites set the focus to their browser window on their own by using window. focus(). This usually leads to the window being moved to the front interrupting whatever action the user was dedicated to at that time. This option specifies the treatment of such attempts.