I might go back and annotate this at some point.

On a side note, 850px for the max width really does a disservice to images like this. The original is not blurry at all.

Edit:

(2023-02-01)

It turns out that this is a bug, since the image was rescaled to 849px instead of 850px, so the browser is attempting to scale it up to 850px and browsers have poor scaling algorithms. I already submitted issue #5426 for this.

(2023-02-09)

Thanks to @magcolo for the annotations.