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CSS light and dark mode without JavaScript requirement and with a class-based override on <html>
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| html { | |
| background-color: | |
| var(--LIGHT, #eee) | |
| var(--DARK, #111); | |
| color: | |
| var(--LIGHT, #000) | |
| var(--DARK, #ccc); | |
| } | |
| html { | |
| --LIGHT: initial; | |
| --DARK: ; | |
| } | |
| @media (prefers-color-scheme: dark) { | |
| html { | |
| --DARK: initial; | |
| --LIGHT: ; | |
| } | |
| } | |
| /* Override `prefers-color-scheme: dark` if class is present */ | |
| html.light-mode { | |
| --LIGHT: initial; | |
| --DARK: ; | |
| } | |
| html.dark-mode { | |
| --DARK: initial; | |
| --LIGHT: ; | |
| } |
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https://www.w3.org/TR/css-variables-1/#guaranteed-invalid
https://css-tricks.com/the-css-custom-property-toggle-trick/
https://github.com/propjockey/css-sweeper#css-is-a-programming-language-thanks-to-the-space-toggle-trick