[REMOVE] Add test sample

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+---
+layout: examples
+title: Test for nested backgrounds
+---
+
+<main class="d-flex flex-column container gap-5">
+  <nav class="navbar navbar-expand-lg bg-body-secondary mb-5">
+    <div class="container-fluid">
+      <a class="navbar-brand" href="#">Normal behavior</a>
+      <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
+        <span class="navbar-toggler-icon"></span>
+      </button>
+      <div class="collapse navbar-collapse" id="navbarSupportedContent">
+        <ul class="navbar-nav me-auto mb-2 mb-lg-0">
+          <li class="nav-item">
+            <a class="nav-link active" aria-current="page" href="#">Home</a>
+          </li>
+          <li class="nav-item">
+            <a class="nav-link" href="#">Link</a>
+          </li>
+          <li class="nav-item dropdown">
+            <a class="nav-link dropdown-toggle" href="#" role="button" data-bs-toggle="dropdown" aria-expanded="false">
+              Dropdown
+            </a>
+            <ul class="dropdown-menu">
+              <li><a class="dropdown-item" href="#">Action</a></li>
+              <li><a class="dropdown-item" href="#">Another action</a></li>
+              <li><hr class="dropdown-divider"></li>
+              <li><a class="dropdown-item" href="#">Something else here</a></li>
+            </ul>
+          </li>
+          <li class="nav-item">
+            <a class="nav-link disabled" aria-disabled="true">Disabled</a>
+          </li>
+        </ul>
+        <form class="d-flex" role="search">
+          <input class="form-control me-2" type="search" placeholder="Search" aria-label="Search">
+          <button class="btn btn-outline-success" type="submit">Search</button>
+        </form>
+      </div>
+    </div>
+  </nav>
+  <nav class="navbar navbar-expand-lg bg-body-secondary mb-5" data-bs-theme="light">
+    <div class="container-fluid">
+      <a class="navbar-brand" href="#">Previous forced light</a>
+      <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarSupportedContent2" aria-controls="navbarSupportedContent2" aria-expanded="false" aria-label="Toggle navigation">
+        <span class="navbar-toggler-icon"></span>
+      </button>
+      <div class="collapse navbar-collapse" id="navbarSupportedContent2">
+        <ul class="navbar-nav me-auto mb-2 mb-lg-0">
+          <li class="nav-item">
+            <a class="nav-link active" aria-current="page" href="#">Home</a>
+          </li>
+          <li class="nav-item">
+            <a class="nav-link" href="#">Link</a>
+          </li>
+          <li class="nav-item dropdown">
+            <a class="nav-link dropdown-toggle" href="#" role="button" data-bs-toggle="dropdown" aria-expanded="false">
+              Dropdown
+            </a>
+            <ul class="dropdown-menu">
+              <li><a class="dropdown-item" href="#">Action</a></li>
+              <li><a class="dropdown-item" href="#">Another action</a></li>
+              <li><hr class="dropdown-divider"></li>
+              <li><a class="dropdown-item" href="#">Something else here</a></li>
+            </ul>
+          </li>
+          <li class="nav-item">
+            <a class="nav-link disabled" aria-disabled="true">Disabled</a>
+          </li>
+        </ul>
+        <form class="d-flex" role="search">
+          <input class="form-control me-2" type="search" placeholder="Search" aria-label="Search">
+          <button class="btn btn-outline-success" type="submit">Search</button>
+        </form>
+      </div>
+    </div>
+  </nav>
+  <nav class="navbar navbar-expand-lg bg-body-secondary mb-5" data-bs-theme="dark">
+    <div class="container-fluid">
+      <a class="navbar-brand" href="#">Previous forced dark</a>
+      <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarSupportedContent3" aria-controls="navbarSupportedContent3" aria-expanded="false" aria-label="Toggle navigation">
+        <span class="navbar-toggler-icon"></span>
+      </button>
+      <div class="collapse navbar-collapse" id="navbarSupportedContent3">
+        <ul class="navbar-nav me-auto mb-2 mb-lg-0">
+          <li class="nav-item">
+            <a class="nav-link active" aria-current="page" href="#">Home</a>
+          </li>
+          <li class="nav-item">
+            <a class="nav-link" href="#">Link</a>
+          </li>
+          <li class="nav-item dropdown">
+            <a class="nav-link dropdown-toggle" href="#" role="button" data-bs-toggle="dropdown" aria-expanded="false">
+              Dropdown
+            </a>
+            <ul class="dropdown-menu">
+              <li><a class="dropdown-item" href="#">Action</a></li>
+              <li><a class="dropdown-item" href="#">Another action</a></li>
+              <li><hr class="dropdown-divider"></li>
+              <li><a class="dropdown-item" href="#">Something else here</a></li>
+            </ul>
+          </li>
+          <li class="nav-item">
+            <a class="nav-link disabled" aria-disabled="true">Disabled</a>
+          </li>
+        </ul>
+        <form class="d-flex" role="search">
+          <input class="form-control me-2" type="search" placeholder="Search" aria-label="Search">
+          <button class="btn btn-outline-success" type="submit">Search</button>
+        </form>
+      </div>
+    </div>
+  </nav>
+  <nav class="navbar navbar-expand-lg bg-body-secondary mb-5" data-bs-theme="light">
+    <div class="container-fluid">
+      <a class="navbar-brand" href="#">Proposed forced light</a>
+      <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarSupportedContent4" aria-controls="navbarSupportedContent4" aria-expanded="false" aria-label="Toggle navigation">
+        <span class="navbar-toggler-icon"></span>
+      </button>
+      <div class="collapse navbar-collapse" id="navbarSupportedContent4">
+        <ul class="navbar-nav me-auto mb-2 mb-lg-0">
+          <li class="nav-item">
+            <a class="nav-link active" aria-current="page" href="#">Home</a>
+          </li>
+          <li class="nav-item">
+            <a class="nav-link" href="#">Link</a>
+          </li>
+          <li class="nav-item dropdown">
+            <a class="nav-link dropdown-toggle" href="#" role="button" data-bs-toggle="dropdown" aria-expanded="false">
+              Dropdown
+            </a>
+            <ul class="dropdown-menu" data-bs-theme="body">
+              <li><a class="dropdown-item" href="#">Action</a></li>
+              <li><a class="dropdown-item" href="#">Another action</a></li>
+              <li><hr class="dropdown-divider"></li>
+              <li><a class="dropdown-item" href="#">Something else here</a></li>
+            </ul>
+          </li>
+          <li class="nav-item">
+            <a class="nav-link disabled" aria-disabled="true">Disabled</a>
+          </li>
+        </ul>
+        <form class="d-flex" role="search">
+          <input class="form-control me-2" type="search" placeholder="Search" aria-label="Search">
+          <button class="btn btn-outline-success" type="submit">Search</button>
+        </form>
+      </div>
+    </div>
+  </nav>
+  <nav class="navbar navbar-expand-lg bg-body-secondary mb-5" data-bs-theme="dark">
+    <div class="container-fluid">
+      <a class="navbar-brand" href="#">Proposed forced dark</a>
+      <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarSupportedContent5" aria-controls="navbarSupportedContent5" aria-expanded="false" aria-label="Toggle navigation">
+        <span class="navbar-toggler-icon"></span>
+      </button>
+      <div class="collapse navbar-collapse" id="navbarSupportedContent5">
+        <ul class="navbar-nav me-auto mb-2 mb-lg-0">
+          <li class="nav-item">
+            <a class="nav-link active" aria-current="page" href="#">Home</a>
+          </li>
+          <li class="nav-item">
+            <a class="nav-link" href="#">Link</a>
+          </li>
+          <li class="nav-item dropdown">
+            <a class="nav-link dropdown-toggle" href="#" role="button" data-bs-toggle="dropdown" aria-expanded="false">
+              Dropdown
+            </a>
+            <ul class="dropdown-menu" data-bs-theme="body">
+              <li><a class="dropdown-item" href="#">Action</a></li>
+              <li><a class="dropdown-item" href="#">Another action</a></li>
+              <li><hr class="dropdown-divider"></li>
+              <li><a class="dropdown-item" href="#">Something else here</a></li>
+            </ul>
+          </li>
+          <li class="nav-item">
+            <a class="nav-link disabled" aria-disabled="true">Disabled</a>
+          </li>
+        </ul>
+        <form class="d-flex" role="search">
+          <input class="form-control me-2" type="search" placeholder="Search" aria-label="Search">
+          <button class="btn btn-outline-success" type="submit">Search</button>
+        </form>
+      </div>
+    </div>
+  </nav>
+</main>