Viewport Units for font sizes

Hi all,

as it looks[1], viewport units for font-sizes would be great for 
responsive web design but apparently are not accessible _at all_ because 
they are defined as fixed measurements – almost like pixels. And as 
the viewport is getting smaller when you zoom in, the calculated font 
size stays the same.

Take a look at this example and try to scale it in a browser that 
supports viewport units[2]:

http://codepen.io/vcurd/full/ByerKw

I wonder if people are aware of this and if we might to add a failure 
technique. I also wonder if we may be able to turn the car around and 
work out an implementation with CSS WG that allows implementation… (I 
don’t know if there is a solution that removes the main benefit for 
people using low vision that they can get the mobile view on a desktop 
and don’t need to scroll horizontally, if properly implemented.)

Best, Eric

[1] https://twitter.com/SaraSoueidan/status/587694001500872704
[2] http://caniuse.com/#feat=viewport-units


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Eric Eggert
Web Accessibility Specialist
Web Accessibility Initiative (WAI) at Wold Wide Web Consortium (W3C)