prefers-color-scheme-svg-as-image-ref.html

<!doctype html>
<head>
  <title>prefers-color-scheme inside an SVG image</title>
  <link rel="help" href="https://www.w3.org/TR/mediaqueries-5/#descdef-media-prefers-color-scheme">
</head>
<style>
  div {
    background-color: blue;
    height: 32px;
    width: 32px;
  }
  @media (prefers-color-scheme: dark) {
    div {
      background-color: purple;
    }
  }
</style>
<p>There should be a purple square below when the preferred color-scheme is dark, and blue otherwise.</p>
<div></div>

chromium/third_party/blink/web_tests/external/wpt/css/mediaqueries/prefers-color-scheme-svg-as-image-ref.html