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  <title>onhashchange — addEventListener</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}button{padding:.45rem .85rem;border:1px solid #cbd5e1;border-radius:8px;background:#fff;font-size:.8125rem;cursor:pointer;margin-right:.5rem}.log{margin-top:.75rem;padding:.75rem 1rem;background:#f0fdf4;border:1px solid #bbf7d0;border-radius:8px;font-size:.8125rem;max-width:420px}</style>

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  <h1>hashchange + addEventListener</h1>

  <p>Click a button or use the nav links to change the hash.</p>

  <button type=button onclick='location.hash="#settings"'>Go to #settings</button>

  <button type=button onclick='location.hash="#profile"'>Go to #profile</button>

  <div class=log id=log>Waiting for hash change…</div>



  <script>var log=document.getElementById("log");window.addEventListener("hashchange",(function(){log.innerHTML="<strong>hashchange fired!</strong> Hash is now: "+(location.hash||"(empty)")}))</script>

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HTML onhashchange Attribute — addEventListener