fix: correctly mangle img/@usemap

questionpy-org · Sep 14, 2023 · a78bf06 · a78bf06
1 parent 7ee1cde
commit a78bf06
Showing 1 changed file with 6 additions and 1 deletion.
diff --git a/classes/question_ui_renderer.php b/classes/question_ui_renderer.php
@@ -342,7 +342,12 @@ private function mangle_ids_and_names(\DOMXPath $xpath, question_attempt $qa): v
                 //xhtml:img/@usemap
                 ") as $attr) {
             $original = $attr->value;
-            $attr->value = $qa->get_qt_field_name($original);
+            if ($attr->name === "usemap" && utils::str_starts_with($original, "#")) {
+                // See https://developer.mozilla.org/en-US/docs/Web/API/HTMLImageElement/useMap.
+                $attr->value = "#" . $qa->get_qt_field_name(substr($original, 1));
+            } else {
+                $attr->value = $qa->get_qt_field_name($original);
+            }
         }
     }