I was looking at yesterday's article on my phone. In horizontal orientation the illustration looked fine:
But in vertical orientation the browser (Firefox 58.0.1) rendered the two SVG images at completely different scales:
I think the two page elements are identical and that the two SVG files have the same natural size, the same scale, etc. Does anyone have any idea why this happened? Is it something I did? Is it something I could prevent?
[ Addendum 20180212: The mystery has been solved; I'll post it here later this week. ]