HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>onpopstate — dynamic 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}#log{padding:.75rem 1rem;background:#eff6ff;border:1px solid #bfdbfe;border-radius:8px;font-size:.875rem;max-width:480px}</style>

</head>

<body>

  <h1>window.onpopstate</h1>

  <p>Push history entries, then navigate with Back/Forward.</p>

  <div class=nav>

    <button type=button onclick='history.pushState({page:"Learn C"},"","/c")'>Go to Learn C</button>

    <button type=button onclick='history.pushState({page:"Learn C++"},"","/cpp")'>Go to Learn C++</button>

  </div>

  <div id=log>Handler not fired yet.</div>



  <script>function dynamicPopStateHandler(e){var t=e.state?e.state.page:"(no state object)";document.getElementById("log").textContent="Dynamic popstate handler — event.state.page: "+t,document.getElementById("log").style.background="#f0fdf4",document.getElementById("log").style.borderColor="#bbf7d0"}history.replaceState({page:"Home"},"",location.pathname),window.onpopstate=dynamicPopStateHandler</script>

</body>

</html>

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HTML onpopstate Attribute — window.onpopstate