[openstreetmap/openstreetmap-website] Add Human facing error messages when users without WebGL use (PR #6782)

[Frank Elsinga]

@CommanderStorm commented on this pull request.



> @@ -6,6 +6,18 @@ maplibregl.Map.prototype._getUIString = function (key) {
   return OSM.i18n.t(`javascripts.map.${snakeCaseKey}`);
 };
 
+OSM.MapLibre.showWebGLError = function (container) {
+  const containerElement =
+    typeof container === "string" ? document.getElementById(container) : container;
+
+  if (containerElement) {
+    fetch("/panes/maplibre/webgl_error")
+      .then(response => response.text())
+      .then(html => containerElement.innerHTML = html)
+      .catch(() => containerElement.innerHTML = OSM.i18n.t("javascripts.map.webgl_error.webgl_is_required_for_this_map"));

Tiles not loading is different and I would need to look into how we handle this. Not sure.
Definitely different from this line.

Which requests can be cached is something we have quite a bit of logic around.

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