Did some experimentation to figure out how different browsers behave with regards to the srcset
and sizes
attribute in various browsers. Documented below.
Vanilla No AMP No CSS Example: https://codepen.io/cathyxz/pen/vbLrrE
<img srcset="https://placekitten.com/200/200 200w,
https://placekitten.com/300/300 300w,