navigation_timing_2 library Null safety

Navigation Timing Level 2

https://w3c.github.io/navigation-timing/

Classes

PerformanceNavigation
Deprecated This feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. Avoid using it, and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time. [...]
PerformanceNavigationTiming
Experimental This is an experimental technologyCheck the Browser compatibility table carefully before using this in production. The interface provides methods and properties to store and retrieve metrics regarding the browser's document navigation events. For example, this interface can be used to determine how much time it takes to load or unload a document.
PerformanceTiming
Deprecated This feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. Avoid using it, and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time. [...]

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