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RE: SC failure for using pixel font size

From: Jonathan Avila <jon.avila@ssbbartgroup.com>
Date: Wed, 16 Jul 2014 20:23:22 -0400
Message-ID: <516a2ba8a980439716e1f43ff40f0f4a@mail.gmail.com>
To: Mike Elledge <melledge@yahoo.com>, Aurélien Levy <aurelien.levy@temesis.com>
Cc: WCAG WG <w3c-wai-gl@w3.org>
Ø  Would this be considered a usability issue, then?

Yes, if you were only testing WCAG Level A and AA and zoom worked in the
accessibility supported technology stack then yes this would just be a
usability issue.

I absolutely agree that many of us want to just enlarge the text and not
everything else – unfortunately I wasn’t involved in these initial
discussions and technique/failure creation and this is the direction the WG
went at that time.  Changing that stance now would likely be very difficult.

I do consider mobile web sites that limit the user scaling to 1.0 as
failing this SC 1.4.4.  For example, Safari on iOS doesn’t provide an
override like other browsers and thus I don’t consider it accessibility


*From:* Mike Elledge [mailto:melledge@yahoo.com]
*Sent:* Wednesday, July 16, 2014 4:39 PM
*To:* Jon Avila; Aurélien Levy
*Subject:* Re: SC failure for using pixel font size

Hi Jon--

Would this be considered a usability issue, then?

I would imagine that some people with low vision would want to increase
font size without enlarging the rest of the page. Fixed font sizes would
make that impossible and could make the page more difficult to use because
of scrolling.

If I understand the question correctly, I would also disagree with the
stance. <smile>


On Wednesday, July 16, 2014 1:22 PM, Jon Avila <jon.avila@ssbbartgroup.com>

Not under WCAG 2 level A or AA but  It would likely but not necessarily
fail under level AAA SC 1.4.8.

SC 1.4.4 allows for user agent zoom to compensate for use of pixel.   So
the only time use of pixels would fail this SC is if it wasn't
accessibility supported by the technology stack.

Personally I don't totally agree with this stance because zoom requires the
user to scroll horizontally.

Under 1.4.8. It would have to zoom without horizontal scroll - this is less
likely to be handles correctly when pixels are used.


On Jul 16, 2014, at 12:58 PM, Aurélien Levy <aurelien.levy@temesis.com>


I have others questions like the one last week about opening new window
without prior notice for the working group members.

I will do each one on a separate thread for more clarity.

Do you consider using pixel font size for text in a  as a WCAG success
criteria failure ? (example :
<p class="myfont">some dummy text</p> .myfont{font-size:12px;}

If yes to witch success criteria ? I'm especially interested to have your
opinion one the 1.4.4 SC because I don't see anything saying it's a failure
except on text based form controls (witch isn't the case in my example) so
for me it isn't.

And you what do you think ?


Aurélien Levy
Received on Thursday, 17 July 2014 00:25:01 UTC

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