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Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →When you press Back or Forward and the page comes back exactly as you left it, with the same menu open, the same scroll position and the same half-filled form, the browser has most likely not loaded the page again. It has probably restored a snapshot of the page kept in memory, called the back/forward cache (bfcache). That restore is faster than a normal load, but it can also bring back interface state and data that were current when you left and may no longer be current now.
Why an old page appears after Back
A normal history navigation rebuilds a page. The browser requests the document, creates a fresh DOM, and runs the scripts again. Some of the responses may come from the HTTP cache, but the page is still initialized from the start.
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With bfcache, the browser may instead keep the whole page in memory when you leave it. MDN’s bfcache documentation describes the snapshot as including the entire page and its JavaScript heap. Code that is running is paused when you navigate away and resumed when you return. Chromium’s BFCache overview describes the same idea in plainer terms: when the browser navigates away, it might just pause the page, keeping everything fully intact.
That is why a menu you had expanded, a form field you had typed into, or a variable in a script can reappear unchanged. Nothing was reloaded, so nothing reset.
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How bfcache differs from HTTP caching
The two mechanisms are easy to confuse because both involve “cache,” but they store different things.
| Aspect | Normal history navigation (HTTP cache may help) | bfcache restore |
|---|---|---|
| What is stored | HTTP responses such as HTML, scripts and images | The live page, including its DOM and in-memory JavaScript state |
| Is the page rebuilt? | Yes, the document is parsed and initialized again | No, the existing page is made visible again |
| Does JavaScript state survive? | No, variables and listeners start fresh | Yes, paused code resumes where it stopped |
| Does the page run its load-time code again? | Yes | Not stated as a general rule by the sources reviewed; developers should test their own page |
| Scroll and form state | May be partly restored by the browser | Preserved with the page snapshot |
The practical consequence is that HTTP cache settings do not control bfcache. A page can be fully rebuilt from HTTP cache on one navigation and restored from memory on another.
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A restore is not guaranteed
Browsers do not use bfcache for every history navigation. A page can be ineligible, or a cached snapshot can be evicted to free memory. Eligibility rules differ between browsers, so the same page may behave differently in two of them. Treat bfcache as an optimization that may apply, and test the real behavior in the browsers your readers use.
The most useful check is Chrome’s own test. In DevTools, open Application, then Background services, then Back/forward cache, and run the test. When a page is not restored, the panel reports reasons and the frames involved, which is the fastest way to see what blocked it.
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How to detect a restore in your code
The pageshow event fires after load on the first page load, and again any time the page is restored from bfcache. The event’s persisted property tells you which case you are in. web.dev’s back/forward cache guide, by Philip Walton and Barry Pollard, uses this check as the standard way to recognize a restore.
window.addEventListener("pageshow", function (event) {
if (event.persisted) {
// The page was restored from bfcache.
// Re-check any state that may have changed while the page was away.
}
});Use this check to decide what to refresh. Do not use it to skip initialization that the page still needs on every visit.
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Debugging a page that is not restored
- Add the
pageshowlistener above and confirm, on a second visit through Back, whetherevent.persistedistrue. If it is nevertrue, the page is not being restored from bfcache in that browser. - In Chrome, open DevTools, go to Application, then Background services, then Back/forward cache, and run the test. Note the reported reasons and any frames listed.
- Check for
unloadlisteners. Chrome DevTools flags them as an actionable issue, because they make a page ineligible. The web.dev guide recommends usingpagehideinstead. - Where the browser supports it, inspect
PerformanceNavigationTiming.notRestoredReasons. MDN labels this API experimental with limited availability, so use it as a supplement to the DevTools test rather than as a cross-browser diagnostic.
When restored state may be stale or sensitive
A restored page shows what the page looked like when you left it. If something changed on the server while you were away, the restored view can be out of date. This matters most for:
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- Account pages, where a logout or permission change may have happened in another tab.
- Checkout and payment steps, where prices, stock or totals may have changed.
- Any view that displays personal information on a shared or public computer.
After a restore, the application should verify the state it depends on and update or reload the parts that are time-sensitive. web.dev’s guide also warns that sensitive information needs careful handling in restored pages.
Setting Cache-Control: no-store on pages is a blunt tool. It can keep sensitive responses out of storage, but the guidance reviewed for this article advises against applying it indiscriminately as a performance workaround, because it removes benefits for pages that would be safe to restore. Choose it per page, based on the data involved.
Analytics can miss restored visits
A restored page does not go through the same initial-load path as a fresh visit. If your analytics only record pageviews on load, a restored view may not be counted as a new pageview. Recording a pageshow event when persisted is true lets you count these visits and keep them separate from ordinary loads in performance reporting.
How common this is depends on the audience. The web.dev guide, in its 2026 update, reports Chrome usage data showing that 1 in 10 desktop navigations and 1 in 5 mobile navigations are back or forward navigations. These figures describe how often users navigate backward or forward. They are not a bfcache hit rate, and they do not show how many of those navigations were restored from memory. Sentry’s JavaScript SDK v11 also offers an opt-in bfcache metrics integration, for teams that prefer a monitoring tool to hand-built reporting.
Scope: NinoGames pages specifically
This guide explains general browser behavior. We did not find NinoGames-specific documentation describing its engine, framework, browser support or deployment setup, so the examples above make no assumptions about any of them. If you are debugging a NinoGames page, start with the DevTools test and the pageshow check. Those tell you what the browser is actually doing, whatever the page is built with.
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