The browser can do whatever it wants (read: whatever's best for users) in this case. Current Blink (Chrome/Opera) code wouldn't download the higher res image fo

The browser can do whatever it wants (read: whatever's best for users) in this case. Current Blink (Chrome/Opera) code wouldn't download the higher res image for 'x' descriptors, but that may change in future versions, perhaps tied to user preferences,network info and other possible conditions.