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Prefers Color Scheme lets you use light and dark color schemes in all browsers, following the Media Queries specification.
From the command line, transform CSS files that use prefers-color-scheme
media queries:
npx css-prefers-color-scheme SOURCE.css TRANSFORMED.css
Next, use that transformed CSS with this script:
<link rel="stylesheet" href="TRANSFORMED.css">
<script src="https://unpkg.com/css-prefers-color-scheme/browser.min"></script>
<script>
colorScheme = initPrefersColorScheme('dark') // apply "dark" queries (you can change it afterward, too)
</script>
Dependencies got you down? Don’t worry, this script is only 537 bytes.
prefers-color-scheme
queries using this
PostCSS plugin.Prefers Color Scheme uses a PostCSS plugin to transform
prefers-color-scheme
queries into color-index
queries. This changes
prefers-color-scheme: dark
into (color-index: 48)
,
prefers-color-scheme: light
into (color-index: 70)
, and
prefers-color-scheme: no-preference
into (color-index: 22)
.
The frontend receives these color-index
queries, which are understood in all
major browsers going back to Internet Explorer 9. However, since browsers only
apply color-index
queries of 0
, our color scheme values are ignored.
Prefers Color Scheme uses a browser script to change
(color-index: 48)
queries into not all and (color-index: 48)
in order to
activate “dark mode” specific CSS, and it changes (color-index: 70)
queries
into not all and (color-index: 48)
to activate “light mode” specific CSS.
@media (color-index: 70) { /* prefers-color-scheme: light */
body {
background-color: white;
color: black;
}
}
Since these media queries are accessible to document.styleSheet
, no CSS
parsing is required.
The value of 48
is chosen for dark mode because it is the keycode for 0
,
the hexidecimal value of black. Likewise, 70
is chosen for light mode because
it is the keycode for f
, the hexidecimal value of white.