Issue #3468365: Possibility of inheriting classes from main page heading tags?

Closes #3468365

assets/js/tocjs.js

@@ -214,6 +214,13 @@
       const li = document.createElement('li');
       li.classList.add(opts.itemClass(heading, opts.prefix));
       $(li).addClass(opts.liClasses);
+      if (opts.inheritableClasses.length > 0) {
+        heading.classList.forEach((className) => {
+          if (opts.inheritableClasses.includes(className)) {
+            li.classList.add(className);
+          }
+        });
+      }
       li.append(a);
 
       const level = heading.tagName.slice(-1);