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Register for Protocol Launch Timing Extension to PerformanceNavigationTiming

To help web applications compute end-to-end telemetry for protocol launches we propose adding 2 new fields userAgentStart and protocolLaunchStart to the PerformanceNavigationTiming object. The parameter userAgentStart corresponds to a timestamp captured early in the startup of the browser application. The parameter protocolLaunchStart corresponds to the time when user action that initiated the protocol launch in the non-browser client application. For cold starts; when no browser process has yet been created; the protocolLaunchStart value will be lesser than the userAgentStart value. For warm starts; where one or more browser processes are already running; the protocolLaunchStart value may be higher than the userAgentStart value. These new fields are only populated for protocol launches. Learn more

Available from: Microsoft Edge 98

Available to: Microsoft Edge 103

Trial end date: Jun 23, 2022

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