HTML Code
<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

  <meta name=viewport content="width=device-width,initial-scale=1">

  <title>onpopstate — body handler</title>

  <style>body{font-family:system-ui,sans-serif;margin:0;padding:1.5rem;background:#f8fafc;color:#334155;line-height:1.7}h1{margin:0 0 .75rem;font-size:1.25rem;color:#0f172a}.nav{display:flex;gap:.5rem;flex-wrap:wrap;margin:1rem 0}button{padding:.5rem 1rem;border:1px solid #cbd5e1;border-radius:8px;background:#fff;cursor:pointer;font-size:.875rem}button:hover{background:#eff6ff;border-color:#93c5fd}#status{padding:.75rem 1rem;background:#f1f5f9;border:1px solid #e2e8f0;border-radius:8px;font-size:.875rem;font-weight:600;max-width:420px;color:#475569}#page{margin-top:.75rem;font-size:1.125rem;font-weight:700;color:#0f172a}</style>

</head>

<body onpopstate=popStateHandler(event)>

  <h1>onpopstate on body</h1>

  <p>Click a page button, then use the browser Back or Forward buttons.</p>

  <div class=nav>

    <button type=button onclick='goTo("home","/home")'>Home</button>

    <button type=button onclick='goTo("about","/about")'>About</button>

    <button type=button onclick='goTo("contact","/contact")'>Contact</button>

  </div>

  <p id=page>Current page: Home</p>

  <p id=status>Waiting for popstate…</p>



  <script>

    history.replaceState({ page: "home" }, "", "/home");



    function goTo(page, path) {

      history.pushState({ page: page }, "", path);

      document.getElementById("page").textContent = "Current page: " + page.charAt(0).toUpperCase() + page.slice(1);

      document.getElementById("status").textContent = "Pushed state — use Back/Forward to trigger popstate.";

    }



    function popStateHandler(event) {

      var page = (event.state && event.state.page) ? event.state.page : "unknown";

      document.getElementById("page").textContent = "Current page: " + page.charAt(0).toUpperCase() + page.slice(1);

      document.getElementById("status").textContent = "popstate fired! event.state.page = " + page;

      document.getElementById("status").style.background = "#f0fdf4";

      document.getElementById("status").style.borderColor = "#bbf7d0";

      document.getElementById("status").style.color = "#166534";

    }

  </script>

</body>

</html>
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HTML onpopstate Attribute — body handler
