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

  *   Content can be zoomed to an equivalent width of 320 CSS pixels without loss of content or functionality, and without requiring horizontal or vertical scrolling of the text content.

NOTE: for most Western-based languages, that would be requiring no horizontal scrolling, for vertical-based languages, that would be requiring no vertical scrolling.

It looks like you removed the ‘both’ from the SC, so we can’t have scrolling at all?! (I.e. it has to fit in a 320px box.)
I’m assuming that wasn’t intended.

I’m not sure what the note improves over the current:
“For web pages which are designed to scroll horizontally, the 320px should be taken as the height rather than width.”

-Alastair