Contact emails yu...@chromium.org, fer...@chromium.org
Explainer https://github.com/rubberyuzu/bfcache-not-retored-reason/blob/main/NotRestoredReason.md Specification (Not yet ready) Summary NotRestoredReason API will report the list of reasons why a page is not served from BFcache in a frame tree structure, via PerformanceNavigationTiming API. Blink component UI>Browser>Navigation>BFCache <https://bugs.chromium.org/p/chromium/issues/list?q=component:UI%3EBrowser%3ENavigation%3EBFCache> Motivation Today pages can be blocked from BFCache for different reasons, such as reasons required by spec and reasons specific to the browser implementation. For example, if a page uses a feature such as WebLock and does not release the acquired lock in the pagehide handler, Chrome does not put the page into BFCache. If developers want to make their site restored from BFCache, they have to release the lock in the pagehide handler. Developers can gather the hit-rate of BFCache on their site, i.e. what % of history navigation is served by BFCache, by using the pageshow handler persisted parameter and PerformanceNavigationTiming.type(back-forward). However, there is no way for developers to tell what reasons are blocking their pages from BFCache in the wild. They are not able to know what actions to take to improve the hit-rate. We would like to make it possible for sites to collect information on why BFCache is not used on a history navigation, so that they can take actions on each reason and make their page BFCache compatible. Initial public proposal https://github.com/whatwg/html/issues/7094 https://discourse.wicg.io/t/proposal-back-forward-cache-notrestoredreason-api/5773 TAG review (Not sent yet) Risks Interoperability and Compatibility Gecko: Positive feedback on the GitHub discussion (link <https://github.com/whatwg/html/issues/7094>) WebKit: No signal Web developers: Positive reactions in TPAC WebPerf WG (minutes <https://docs.google.com/document/d/1GQpM8IvL4feXQ0oQdCQIPKhZZkMLNTYJQhBUntMxPkI/edit#heading=h.mo0swzgvknmp> ) Debuggability Is this feature fully tested by web-platform-tests <https://chromium.googlesource.com/chromium/src/+/master/docs/testing/web_platform_tests.md> ? No Flag name (Not yet ready) Requires code in //chrome? False Estimated milestones No milestones specified Link to entry on the Chrome Platform Status https://chromestatus.com/feature/5684908759449600 -- You received this message because you are subscribed to the Google Groups "blink-dev" group. To unsubscribe from this group and stop receiving emails from it, send an email to blink-dev+unsubscr...@chromium.org. To view this discussion on the web visit https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAP-nMoGta9PXgUGt2Gv0XVNM_NKUtnkdN_vwbajds1AtqPM7vA%40mail.gmail.com.
