The latest version of Safari Technology Preview for macOS adds "prefers-color-scheme" media query support. This allows developers to serve up alternative CSS specifically for light and dark color schemes. I find this an interesting feature, since most web pages look "pale" when visiting with Dark Mode enabled in macOS Mojave.
I played around a bit with this new media query and updated my blog to have a dark color scheme available. To try this out yourself, please visit my website using Safari Technology Preview 68 in macOS Mojave and turn on Dark Mode (under System Preferences > General), or check out the video embedded below.
Technical details
Included below a very simple code snippet which you can use to detect the color scheme preference of the visitor:
@media (prefers-color-scheme:dark) {
body {
background-color: #2f2f2f;
}
}