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

  <title>onpageshow — event.persisted</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}#log{padding:.75rem 1rem;background:#eff6ff;border:1px solid #bfdbfe;border-radius:8px;font-size:.875rem;max-width:420px}#data{margin-top:.75rem;padding:.75rem 1rem;background:#f8fafc;border:1px dashed #cbd5e1;border-radius:8px;font-size:.875rem;max-width:420px}a{color:#2563eb}</style>

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  <h1>event.persisted demo</h1>

  <p>Visit <a href=https://example.com target=_blank>another page</a>, then Back.</p>

  <div id=log>Waiting for pageshow…</div>

  <div id=data>Data version: not loaded</div>



  <script>var log=document.getElementById("log"),data=document.getElementById("data"),version=1;function loadData(){version+=1,data.textContent="Data version: v"+version+" (fetched at "+(new Date).toLocaleTimeString()+")"}window.addEventListener("pageshow",(function(e){e.persisted?(log.textContent="Restored from bfcache — refetching stale data…",log.style.background="#fef3c7",log.style.borderColor="#fde68a",loadData()):(log.textContent="Fresh load — initializing page.",log.style.background="#f0fdf4",log.style.borderColor="#bbf7d0",loadData())}))</script>

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HTML onpageshow Attribute — event.persisted