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sizes="auto" is a great new feature of HTML for lazy loaded responsive images.
are we dealing with an
with sizes=auto? Then its natural dimensions are 300×150. NO EXCEPTIONS.
But this is not an issue, because you already have width and height attributes in your HTML, right?
Right?
The present and potential future of progressive image rendering
So if the browser manages to download 6 kB then stalls, then AVIF can produce a better result. But since the AVIF rendering is only two-pass, if the…
kliksphilip
JPEG VS AVIF - The Battle of Compression
In this super thorough study I test one single HD image and come to vast sweeping conclusions about JPEG XL and AVIF. But that's still one image comparison…
Should I please Lighthouse with modern image formats, or my visitors with progressive rendering of large images in my photography site? 🤔
Of course, this would be much easier with genaralized JPEG XL support, both modern and allowing progressive… 🤷♂️
Most mentions of the magical CSS object-fit: cover; in development tutorials should be accompanied by a warning: in most situations, it means the browser will download an image that is larger than required (at least in one direction), and optimization on the server side could be a better option.
Jon Sneyers
This consolidates JPEG XL’s position as the best image codec currently available, for both lossless and lossy compression, across the quality range…
Eric Portis 
Jake Archibald