<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_r1888029451">app/assets/javascripts/heatmap.js</a>:</p>
<pre style='color:#555'>> +  const heatmapElement = document.querySelector("#cal-heatmap");
+
+  if (!heatmapElement) {
+    console.warn("Heatmap element not found in the DOM.");
+    return;
+  }
+
+
+  const heatmapData = heatmapElement.dataset.heatmap ? JSON.parse(heatmapElement.dataset.heatmap) : [];
+
+  try {
+    // eslint-disable-line no-undef
+    const cal = new CalHeatmap();
+    const applicationData = $("head").data();
+    const locale = applicationData.locale;
+    const theme = getTheme();
</pre>
<p dir="auto">We can watch for change of color theme with<br>
<a href="https://developer.mozilla.org/en-US/docs/Web/API/MediaQueryList/change_event" rel="nofollow">https://developer.mozilla.org/en-US/docs/Web/API/MediaQueryList/change_event</a></p>

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