W3C home > Mailing lists > Public > public-comments-wcag20@w3.org > May 2010

pixel font-sizing and WCAG 2.0

From: aurélien levy <aurelien.levy@temesis.com>
Date: Mon, 31 May 2010 15:35:02 +0200
Message-ID: <4C03BB06.9010001@temesis.com>
To: public-comments-wcag20@w3.org
Hi,

I sought an official response about the prohibition (or not) of pixel 
font-sizing in wcag 2.0. (like with font-size: 12px in CSS)
For now, IE still doesn't scale if we just speak about font size and not 
a zoom feature.
As far as I know, I didn't see any failures prohibiting it, except for 
the F80 for form fields (F69 isn't applicable as if I use pixel the text 
didn't resize).

In my opinion if your intend was to prohibiting pixel font sizes on a 
AAA level, in the 1.4.8 sufficient techniques there is two gaps :
- a missing G142 like sufficient technique saying "Using a technology 
that has commonly-available user agents that support zoom and does not 
require the user to scroll horizontally to read a line of text" (like 
with the small screen rendering mode in Opera browser).
- a failure saying "Failure of Success Criterion 1.4.8 due to using 
pixel for font sizes in CSS or a technology that has commonly-available 
user agents that support zoom that DO require the user to scroll 
horizontally to read a line of text

if your intend was to prohibiting pixel font sizes on a AA level :
- change the G142 techniques to "Using a technology that has user agents 
that support zoom" this way I can use this techniques only if I am on a 
environment where I can be 100% sure that every users have an user 
agents that support zoom
- add a failure saying "Failure of Success Criterion 1.4.4 due to using 
pixel for font sizes in CSS and NOT using a technology that has user 
agents that support zoom" or "Failure of Success Criterion 1.4.4 when 
text do not resize when visually rendered text is resized up to 200%"

if your intend wasn't to prohibiting pixel font sizes at all there is 
nothing to add but I need an official statement about that

Best regards,

Aurélien Levy
----
Temesis
Received on Monday, 31 May 2010 13:35:40 UTC

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