Loqi[preview] [BMO] SVG allows you to embed CSS.
CSS can detect dark mode.
Make your favicons in SVG!Simple example:<svg viewBox="0 0 16 16" xmlns="http://www.w3.org/2000/svg">
<style>
@media (prefers-color-scheme: dark) {
.r {fill: white}
}
</style>
...
