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Chrome native lazy loading is quite different from lazy loading through JavaScript libraries like LazySizes:

Chrome does fire 2048 byte range GET requests for all images that do not have explicit dimensions set, you can see those requests if you inspect network tab closely.


It does this so the layout can be calculated before the images are fully loaded.


Furthermore, it does havbe a dynamic threshold of 3000-8000 pixels, which is quite a lot.


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