[lakpan]

Nitpick: interesting how a UX website doesn’t let me resize it since the font is likely set via viewport units.

[amatecha]

Huh, which browser? Scales flawlessly for me in Firefox. Actually one of the smoothest-scaling websites I've encountered in ages, wow. Nice!

[lakpan]

iPhone Safari.

Judging by the comments, they set the text via viewport units only on smaller viewports.

[michaelcampbell]

Looks like px if my inspector isn't lying to me. Ctrl-+ and Ctrl-- work fine for me on desktop/chrome.

[beebeepka]

Firefox has always been even better because you can easily scale only the fonts.

[lakpan]

If the website uses viewport units Firefox can’t do it either, IIRC. My guess is that the website uses vw only on “mobile”