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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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In
color: var(--LIGHT, #000) var(--DARK, #ccc);, when--LIGHTis invalid (set toinitial) it falls back to#000, at the same time--DARKis valid (a whitespace) so that part just evaluates to a whitespace instead of#111.