Dark Mode Favicons

Oooo! A bonafide trick from Thomas Steiner. Chrome will soon be supporting SVG favicons (e.g. <link rel="icon" href="/icon.svg">). And you can embed CSS within an SVG with a <style> element. That CSS can use a perfers-color-sceme media query, and as a result, a favicon that supports dark mode!

<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg">
  <style>
    circle {
      fill: yellow;
      stroke: black;
      stroke-width: 3px;
    }
    @media (prefers-color-scheme: dark) {
      circle {
        fill: black;
        stroke: yellow;
      }
    }
  </style>
  <circle cx="50" cy="50" r="47"/>
</svg>

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Safari also supports SVG, but it's different...

<link rel="mask-icon" href="/favicon.svg" color="#990000">

You specify the color, so there is no opportunity there for a dark mode situation. A little surprising, since Apple is so all-in on this dark mode stuff. I have no idea if they plan to address that or what.

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