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

[Frank Elsinga]

@CommanderStorm commented on this pull request.



> @@ -7,6 +7,34 @@ 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) {
+    const errorDiv = document.createElement("div");
+    errorDiv.className = "maplibre-error";
+    errorDiv.setAttribute("data-compact-message", "WebGL is required for this map.");
+    errorDiv.innerHTML = `
+      <p>
+        We are sorry, but it seems that your browser does not support

Shure, adding a hint for settings is resonable.

<img width="900" height="749" alt="image" src="https://github.com/user-attachments/assets/19712764-53c8-4a13-a15a-1f9368cf55ee" />

If the device is broken, this is not something that is easily detectable for us or fixable for the user => I don't think that this is a good hint.. maybe you have a concrete wording in mind

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