It's sans-serif, hence the difference.
What's extremely interesting is that on my laptop, HN is 12px when Firefox is full screen, but 13.33px when Firefox only uses the left or right half of my screen.
What's extremely interesting is that on my laptop, HN is 12px when Firefox is full screen, but 13.33px when Firefox only uses the left or right half of my screen.
Yeah -- this is a common strategy for mobile rendering which on the face of it seems quite counterintuitive, but actually isn't.