Under what circumstances are each of the 3 resolutions displayed in the browser?
I created a new Blocs document and added a single IMG to the page. I then created 3 pics (1200px wide, 2400px wide & 3600px wide) and added them to the appropriate 1x/2x/3x places in the right sidebar in Blocs. When I then preview on my 5K iMac in Safari, regardless of the browser window width, if I click-and-drag the pic to the address bar, I see from the filename that it is the 2x pic. Does the 1x pic only show on normal (non-Retina) screens? If so, then when does the 3x pic display?
Why is the IMG box blank when I add pics to 1x/2x/3x? Is this a bug? The placeholder image goes missing and the box contents are blank until I mouseover, at which time I only see the blue circular dual-arrow icon in the middle. Since all 3 pics (1x/2x/3x) are the same pic, just different resolutions, why not display one of them?