Bfcache iphone. Developers can use this information to identify pages that need updates to make them bfcache-compatible, thereby improving site performance. However, why is it that ONLY the Safari browser causes the original bug that I found and all other browsers seem to be able to handle back button behavior properly? The back/forward cache, or bfcache, is a performance-enhancing feature available in modern browsers that enables instant back and forward navigation between previously-visited pages. I did some more digging and found that apparently, most modern browsers implement a bfcache for performance reasons. BFCache (Back/Forward Cache) is a user agent feature that allows user agents to keep a document alive in the back-forward cache after the user navigates away from it. This is different from normal cache which only caches HTML code. Make sure your analytics tracks pageviews from bfcache restoration events. Tip: Test bfcache in a guest profile or incognito mode. Apr 4, 2024 · BFCache stands for backwards/forwards cache, and is a mechanism that allows browsers to keep a snapshot of an entirely rendered page in-memory. A list of actionable tips. Click the Test back/forward cache button. Makes sense. When page is loaded for bfcache onload event wont be triggered. It does this by storing a complete snapshot of a page as the user navigates away from it; the browser can then quickly restore the snapshot if the user decides to return to it, rather than needing to repeat the What is BFCache you might ask? BFCache stands for B ackwards F orwards Cache, and it's a mechanism that modern browsers use to keep a snapshot of an entirely rendered page in memory. Learn about and Mar 31, 2018 · これはSafariのbfcache (back-forward cache)という仕組みによるものだそうです。 どんなものか調べてみたところ、ブラウザ側が親切でページを完全にキャッシュしておき、違うページからブラバしたときにキャッシュから読むことで高速化をしているらしいです。 Mar 13, 2025 · When bfcache works correctly, many page loads become instant restores. Instead you can check the persisted property of the onpageshow Feb 20, 2023 · Learn everything you need to know about bfcache and how to fix the “Page prevented back/forward cache restoration" warning. To test if your page can be cached: Open the Application tool. Jul 22, 2025 · The PerformanceNavigationTiming. But what happens to the execution of Javascript code? Well, the browser takes a snapshot of Nov 30, 2022 · 🐛 Bug description Back / Forward cache is broken on Safari, iOS Chrome and iOS Safari (at least) On MacOS, everything is working on Chrome & Firefox. When user navigates back with back button page can be loaded from cache very quickly. A list of affected frames. It is supposed to save complete state of page when user navigates away. Jul 11, 2025 · The back/forward cache, or bfcache, is a performance-enhancing feature available in modern browsers that enables instant back and forward navigation between previously-visited pages. I’m setting this thread as a duplicate but here’s the original for reference: WIP: Page Scroll Position Issue on Refresh with "Enable Query Sort/Filter/Live Search" Feature Enabled. Click Back/forward cache in the side bar. notRestoredReasons property reports information on why the current document was blocked from using the bfcache on navigation. It significantly enhances user experience by enabling instantaneous navigation when users move backward or forward through their browsing history. What is the difference between bfcache and HTTP cache? Put simply, bfcache is a snapshot of the entire page stored in-memory (including the JavaScript heap), whereas the HTTP cache includes only the previously requested resources. No other browsers mobile or desktop have this behavior from what I can find. If bfcache isn't working: Instantly see the reason. 🔍 Bug reproduction I didn't highlight it in cod Dec 5, 2023 · Watch the video to learn how to: Test bfcache with a click. What about dynamic content? Not all web pages can be cached in bfcache though. Oct 11, 2024 · With back/forward cache (bfcache), instead of destroying a page when the user navigates away, we postpone destruction and pause JS execution. This solves my issue. Feb 23, 2016 · Safari and Safari ios mobile uses the bfcache when a user clicks the 'back button' to return to the previous html page. Collect the "not restored" reasons from actual users with the Back/forward cache notRestoredReasons API. Dec 19, 2024 · Thanks for the update! looks like this is connected to another bug with query filters which we already have on our internal bug tracker to fix. . Chrome and Edge have a new tool that lets you detect potential issues with a page that might prevent it from being bfcache'd. Jun 22, 2015 · bfcacheとは bfcache とは、ざっくり言うとブラウザの戻るボタンや進むボタンを押して画面遷移した時に、onload イベントが発火せず、JavaScript の状態が保存されたキャッシュが呼ばれて表示されることです。 May 23, 2017 · Your problem is caused by back-forward cache. If the user navigates back soon, we make the page visible again and unpause JS execution. May 7, 2025 · In the realm of web performance optimization, the Back/Forward Cache (bfcache) stands out as a pivotal feature in modern browsers. This results in a near instant page navigation for the user. This way, when users navigate backwards or forwards, the page is shown almost immediately, with barely any load times. Since these would have been repeat visits (which are usually faster), your average page load times might look worse even though user experience has improved. Run Lighthouse that also includes the bfcache test. yhdo qsa tmq gjeyfm ndsabeib cyjon upnta ofzo zqou aio