HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS display-mode App Nav</title>
  <style>
    body {
      font-family: system-ui, sans-serif;
      padding: 1.5rem;
      margin: 0;
    }

    .app-nav {
      display: none;
    }

    @media (display-mode: standalone) {
      .app-nav {
        display: flex;
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        justify-content: space-around;
        padding: 0.65rem;
        background: #fff;
        border-top: 1px solid #e2e8f0;
        font-size: 0.8125rem;
      }
      body {
        padding-bottom: 3.5rem;
      }
    }
  </style>
</head>
<body>
  <h1>App Content</h1>
  <p>Bottom nav appears in standalone PWA mode.</p>
  <nav class="app-nav">
    <span>Home</span>
    <span>Search</span>
    <span>Profile</span>
  </nav>
</body>
</html>

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CSS display-mode - PWA Bottom Navigation