What is my available screen size?
Available size is the usable desktop area after subtracting system UI such as the taskbar or dock (availWidth × availHeight).
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Available screen
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FAQ
Full resolution is the entire screen. Available size excludes space taken by taskbars, docks, or menu bars.
A taskbar or notch-safe area reduces the usable height reported as availHeight.
A maximized window often approaches available size, but window chrome can still differ.
Values usually refer to the screen that contains the browser window.
On phones, available size may still reflect browser and system UI quirks; treat it as a hint.