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

<hr>

<p>In <a href="https://github.com/openstreetmap/openstreetmap-website/pull/5402#discussion_r1923769736">app/assets/javascripts/heatmap.js</a>:</p>
<pre style='color:#555'>> +//= require popper
+//= require tooltip
+
+
+/* global CalHeatmap, CalendarLabel, Tooltip */
+document.addEventListener("DOMContentLoaded", () => {
+  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) : [];
+  const colorScheme = heatmapElement.dataset.siteColorScheme || "auto";
+  const locale = $("head").data().locale;
</pre>
<p dir="auto">I think the entire heatmap can be delayed by putting it in turbo frame or maybe some collapsible section (maybe for performance reasons). You need <code class="notranslate">I18n</code> initialized before anyway, I don't know how you're going to translate dates correctly otherwise. Although popup dates seem to work even if <code class="notranslate">I18n</code> is not initialized before the heatmap because they are constructed later.</p>

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