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Explainer https://github.com/MicrosoftEdge/MSEdgeExplainers/blob/main/PerformanceNavigationTiming%20for%20User%20Agent%20Launch/explainer.md Specification https://github.com/MicrosoftEdge/MSEdgeExplainers/blob/main/PerformanceNavigationTiming%20for%20User%20Agent%20Launch/explainer.md Summary Adds a new value for PerformanceNavigationTiming.type, 'useragent_launch', to help measure the cold start scenario during page load. This allows a web developer to measure the performance of their application code compared to the cost of browser initialization tasks. This is a pain point for pinned PWAs or WebView apps that will often require a cold start of the user agent. Blink component Blink>PerformanceAPIs>NavigationTiming<https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink%3EPerformanceAPIs%3ENavigationTiming> Motivation Despite the variety of performance measurements available through the current API, it's difficult to discern from the NavigationType whether the measurements reflect those of a regular navigation under normal browsing or of one where the browser is in a non-optimal performance state, such as a cold start. A browser launch is one of the most expensive performance scenarios commonly encountered in typical PWA and WebView patterns. Our proposal seeks to create a new value for the NavigationType enum to differentiate this condition from others in measurements of web application performance. Modifying the NavigationType to include state for a user agent launch (i.e. useragent_launch) will enable engineers to determine whether a given measurement is taken from a launch scenario, enabling greater differentiation of application performance from browser performance in scenarios where the browser engine is launched and terminated frequently. Examples include: Electron apps, system WebViews, or other application scenarios where the browser is relatively short-lived or commonly launched from a terminated state. Initial public proposal https://discourse.wicg.io/t/proposal-user-agent-launch-type-in-performancenavigationtiming/5875 TAG review TAG review status Pending Risks Interoperability and Compatibility Gecko: No signal WebKit: No signal Web developers: No signals Other signals: WebView application risks Does this intent deprecate or change behavior of existing APIs, such that it has potentially high risk for Android WebView-based applications? Debuggability Is this feature fully tested by web-platform-tests<https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>? No Flag name MsUserAgentLaunchNavType Requires code in //chrome? False Estimated milestones M105 Link to entry on the Chrome Platform Status https://chromestatus.com/feature/5186950448283648 -- 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/DM6PR00MB0751A324F65AAAAD9544C2028ED09%40DM6PR00MB0751.namprd00.prod.outlook.com.
