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

  <title>onpagehide — 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}a{color:#2563eb}</style>

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  <h1>event.persisted demo</h1>

  <p>Click <a href=https://example.com target=_blank>this link</a>, then use Back.</p>

  <div id=log>Navigate away and return to see persisted status.</div>



  <script>var log=document.getElementById("log");function saveNote(){sessionStorage.setItem("persisted-note","saved-on-hide")}window.addEventListener("pagehide",(function(e){saveNote(),sessionStorage.setItem("persisted-flag",e.persisted?"cached":"discarded")})),window.addEventListener("pageshow",(function(e){var t=sessionStorage.getItem("persisted-flag");e.persisted?(log.textContent="pageshow: restored from bfcache (persisted=true).",log.style.background="#f0fdf4",log.style.borderColor="#bbf7d0"):"discarded"===t?log.textContent="Fresh load — previous page was not cached.":"cached"===t&&(log.textContent="Page was cached on hide — check Back navigation.")}))</script>

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HTML onpagehide Attribute — event.persisted