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w3c / resource-timing

Resource Timing
https://w3c.github.io/resource-timing/
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Adding resource discovery time to ResourceTiming API structure #374

Open giacomozecchini opened 1 year ago

giacomozecchini commented 1 year ago

The structure of the ResourceTiming API does not include details about the discovery time of a specific resource.

One potential use case for this new attribute is to analyze whether the Largest Contentful Paint element is discovered late during the rendering process.

clelland commented 1 year ago

We talked about this in the last WG meeting, and it seems there would be some work involved in specifying exactly when "discovery" occurs (especially in the preload scanner, as that's likely not well-defined anywhere). I think that we'd also like to know what kind of support this has; whether there are enough real world use cases.

nicjansma commented 1 year ago

Notes from the April 13th 2023 W3C WebPerf Working Group meeting: https://docs.google.com/document/d/1fIgfd7ONz-sES55qRFHQI_eQUnynnyX2Asrs-cwAQ_Q/edit#heading=h.74m0x7yxo8eu