Test results for `srcset` and `sizes`

Here is a recording of the images that were loaded for various device, browser and window sizes combinations for the examples above.

See the worked example for details on why this value was chosen.
The moto e(7i) power + Samsung Internet selects a 1200px image for srcset and sizes. Here what I'd actually expect is: (min-width: 300px) 300px matches. 300 CSS pixels * 1.75 DPR = 525 device pixels. Match the 600x600.png 600w image. This is what both Chrome and Firefox do.

Test results for srcset and sizes