Eric Portis digs into how the browser decides which image to downloads when you give it
<img srcset="" sizes"">. Notably, a browser can do whatever it wants:
Intentionally un-specified behavior lets browsers provide innovative answers to an open-ended question.
Still, calculations happens based on what you give it and you can still do a good job with that part.
The very weirdest part about all this is that the
sizes attribute can alter an images “natural width”, which can …