RE: Interaction of "zoom content" and vertical writing modes

> Since there seems to be agreement this is primarily future proofing, can we cover it with a note?

That would be my preference, and it’s already there!

“320 CSS pixels is equivalent to a starting viewport width of 1280 CSS pixels wide at 400% zoom. For web pages which are designed to scroll horizontally, the 320px should be taken as the height rather than width.”
Cheers,

-Alastair