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Support System Color Scheme Preference #27

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@tubbo tubbo commented Jan 23, 2023

Currently, Radix Colors does not easily support the concept of a machine's own preference for dark/light mode. This poses a problem when trying to write CSS for dark mode without copying a whole bunch of variable definitions around. Inspired by the way Pico CSS handles things, and allowing compatibility between the two, this commit changes how dark mode is enabled for the document element by using a data- theme attribute rather than a class name. This attribute can be set to either "dark" or "light", and uses some clever CSS trickery (inspired by @Zwyx's comment about Pico) to achieve automatically setting color variables to the right settings when the system preference for dark or light mode is set.

To maintain backwards compatibility, these new variants are built using a different file naming convention. The CSS with .dark-theme will still be available in ${scale}.css files, but the "classless" variants that use data-attributes are now available in ${scale}.classless.css files.

Resolves: #26

Currently, Radix Colors does not easily support the concept of a
machine's own preference for dark/light mode. This poses a problem
when trying to write CSS for dark mode without copying a whole bunch
of variable definitions around. Inspired by the way Pico CSS handles
things, and allowing compatibility between the two, this commit changes
how dark mode is enabled for the document element by using a `data-
theme` attribute rather than a class name. This attribute can be set to
either "dark" or "light", and uses some clever CSS trickery (inspired
by [@Zwyx's comment about Pico](https://github.com/radix-ui/colors/
issues/26#issuecomment-1375542488)) to achieve automatically setting
color variables to the right settings when the system preference for
dark or light mode is set.

To maintain backwards compatibility, these new variants are built using
a different file naming convention. The CSS with `.dark-theme` will
still be available in `${scale}.css` files, but the "classless" variants
that use data-attributes are now available in `${scale}.classless.css`
files.

Resolves: radix-ui#26
@Zwyx
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Zwyx commented Jan 24, 2023

Thank you for doing this! I really like that it allows compatibility between Pico and Radix 💯

@tubbo
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tubbo commented Mar 14, 2023

javascript rules.

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How to use with prefers-color-scheme?
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