HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>onhashchange — initial load</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;margin-bottom:1rem;flex-wrap:wrap}nav a{padding:.35rem .75rem;border:1px solid #cbd5e1;border-radius:8px;font-size:.8125rem;text-decoration:none;color:#334155}[data-view]{padding:.75rem 1rem;background:#fff;border:1px solid #e2e8f0;border-radius:8px;max-width:420px}</style>

</head>

<body>

  <h1>Tab views from hash</h1>

  <p>Try opening this page with <code>#about</code> in the URL.</p>

  <nav>

    <a href=#home>Home</a>

    <a href=#about>About</a>

    <a href=#contact>Contact</a>

  </nav>



  <section data-view=home>

    <h2>Home</h2>

    <p>Welcome — default view when hash is empty or #home.</p>

  </section>

  <section data-view=about hidden>

    <h2>About</h2>

    <p>About page — shown when hash is #about.</p>

  </section>

  <section data-view=contact hidden>

    <h2>Contact</h2>

    <p>Contact page — shown when hash is #contact.</p>

  </section>



  <script>function renderFromHash(){var e=location.hash.slice(1)||"home";document.querySelectorAll("[data-view]").forEach((function(a){a.hidden=a.dataset.view!==e}))}window.addEventListener("hashchange",renderFromHash),renderFromHash()</script>

</body>

</html>

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HTML onhashchange Attribute — Initial hash on load