<p></p>
<p><b>@HolgerJeromin</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/openstreetmap/openstreetmap-website/pull/5402#discussion_r1914788494">app/assets/javascripts/heatmap.js</a>:</p>
<pre style='color:#555'>> +function getThemeFromColorScheme(colorScheme) {
+  if (colorScheme === "auto") {
+    return window.matchMedia("(prefers-color-scheme: dark)").matches ? "dark" : "light";
+  }
+  return colorScheme; // Return "light" or "dark" directly if specified
+}
</pre>
<p dir="auto"><code class="notranslate">getThemeFromColorScheme</code> returns the correct theme. Yes.<br>
But it is only called on load (<code class="notranslate">DOMContentLoaded</code>) and not when the user changes operating system theme.</p>
<p dir="auto">Missing something like:<br>
<code class="notranslate">window.matchMedia("(prefers-color-scheme: dark)").addEventListener("change", xy);</code></p>

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