Drop deprecated .dropup remaining usage

.cspell.json

@@ -38,8 +38,6 @@
     "discoverability",
     "docsref",
     "dropend",
-    "dropleft",
-    "dropright",
     "dropstart",
     "dropup",
     "dgst",

js/tests/visual/menu-submenu.html

@@ -271,15 +271,15 @@ <h2>Navbar Integration</h2>
         </nav>
       </section>
 
-      <!-- Dropup with Submenus -->
+      <!-- Submenus with Top Placement -->
       <section class="test-section">
-        <h2>Dropup with Submenus</h2>
-        <p class="fg-2">Submenus work with dropup direction.</p>
+        <h2>Submenus with Top Placement</h2>
+        <p class="fg-2">Submenus work in upward direction.</p>
 
         <div class="demo-box demo-box-center" style="min-height: 200px;">
-          <div class="btn-group dropup">
-            <button type="button" class="btn-solid theme-warning" data-bs-toggle="menu" aria-expanded="false">
-              Dropup Menu
+          <div class="btn-group">
+            <button type="button" class="btn-solid theme-warning" data-bs-toggle="menu" data-bs-placement="top" aria-expanded="false">
+              Menu (opens top)
             </button>
             <div class="menu">
               <a class="menu-item" href="#">Action</a>

site/src/assets/examples/navbar-bottom/index.astro

@@ -28,8 +28,8 @@ export const title = 'Bottom navbar example'
         <li class="nav-item">
           <a class="nav-link disabled" aria-disabled="true">Disabled</a>
         </li>
-        <li class="nav-item dropup">
-          <a class="nav-link" href="#" role="button" data-bs-toggle="menu" aria-expanded="false">Dropup</a>
+        <li class="nav-item">
+          <a class="nav-link" href="#" role="button" data-bs-toggle="menu" aria-expanded="false">Menu</a>
           <div class="menu">
             <a class="menu-item" href="#">Action</a>
             <a class="menu-item" href="#">Another action</a>

site/src/content/docs/guides/migration.mdx

@@ -150,6 +150,7 @@ Bootstrap 6 is a major release with many breaking changes to modernize our codeb
 - Removed jQuery support and the `js-test-jquery` test target.
 - **Replaced the Dropdown component with Menu.** All `.dropdown-*` classes are now `.menu-*` classes, and `data-bs-toggle="dropdown"` is now `data-bs-toggle="menu"`. See the [Menu docs]([[docsref:/components/menus]]) for full details.
   - Renamed CSS classes: `.dropdown-menu` to `.menu`, `.dropdown-item` to `.menu-item`, `.dropdown-divider` to `.menu-divider`, `.dropdown-header` to `.menu-header`, `.dropdown-submenu` to `.submenu`.
+  - Deprecated directional wrappers: `.dropstart`, `.dropend`, and `.dropup`. Use `data-bs-placement` to control direction instead (for example, `.dropup` becomes `data-bs-placement="top"`).
   - Removed the `.dropdown-toggle` class — menu toggles no longer require a toggle class.
   - Removed the `.dropdown` wrapper — no wrapper element is required. The toggle and `.menu` are direct siblings.
   - Simplified markup from `<ul><li><a class="dropdown-item">` to a flat `<div class="menu"><a class="menu-item">` structure.