This has been patched. Thank you.

I disagree. When I saw the page, I thought, "Finally an information dense page again! It's been so long since they've been common and I miss them."

I think the default target is expecting a smaller screen mobile device, hence the 13px default. This is a good idea, and any other screen sizes that see smaller text can still zoom in using default browser behaviors.

Agree, even just converting to use em instead of px is more usable on differing screen size/dpi

Yup. Even on mobile the text is too small for me. In particular, the line-height could be larger so links can be tapped more easily.

Nice though, I like it.