Built-in Variables
`fastn` comes with some built-in variables, they are documented here.
Contents
- [ftd.dark-mode](/built-in-variables/#ftd-dark-mode)
- [ftd.system-dark-mode](/built-in-variables/#ftd-system-dark-mode)
- [ftd.follow-system-dark-mode](/built-in-variables/#ftd-follow-system-dark-mode)
- [ftd.device](/built-in-variables/#ftd-device)
- [ftd.mobile-breakpoint](/built-in-variables/#ftd-mobile-breakpoint)
`ftd.dark-mode`
Type
`boolean`
`ftd.dark-mode` tells you if the UI should show dark or light mode. To change
the system preference use the built in functions.
`ftd.system-dark-mode`
Type
`boolean`
This variable tells if the system prefers dark or light mode. `ftd.dark-mode`
may not be equal to `ftd.system-dark-mode` if `ftd.follow-system-dark-mode` is
`false`.
`ftd.follow-system-dark-mode`
Type
`boolean`
This variable tells if the user prefers the UI to follow system dark mode
preferences of if the user prefers to set this value.
`ftd.device`
Type
`string`
This value is either `mobile` or `desktop`. `ftd.device` is automatically
updated when the browser resizes and device width crosses
`ftd.mobile-breakpoint` and `ftd.desktop-breakpoint` thresholds.
`ftd.mobile-breakpoint`
Type
`integer`
Default Value
768
`ftd.mobile-breakpoint` is the width in pixels below which `fastn` assumes that
the device is a mobile device, and sets `ftd.device` to `mobile`.
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