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Re: 200% website scaling


From: wolfgang.berndorfer@zweiterblick.at
Date: Dec 1, 2019 12:54PM

Thanks Glen and Patrick for explanations!

So is it correct to say:

a) If an element passes 1.4.10, it passes 1.4.4 (Reflow is a sufficient
technique to resize text properly up to 200% zoom).
b) Since both criteria are listed up under the same conformance level AA,
1.4.4 is only to be applied for the exceptions in 1.4.10. (Only these
exceptions need no reflow and therefore need mechanisms like scroll bars to
avoid overlapping.)

I'm not sure about b) since I still don't understand, why 1.4.4 considers
200% magnification and 1.4.10 400% pixel magnifications..


-----Urspr√ľngliche Nachricht-----
Von: WebAIM-Forum < <EMAIL REMOVED> > Im Auftrag von
Patrick H. Lauke
Gesendet: Samstag, 30. November 2019 15:45
Betreff: Re: [WebAIM] 200% website scaling

On 29/11/2019 17:40, glen walker wrote:
> One of the great (and aggravating) things about accessibility is that
> some issues are subjective.
>> Not really. It's a display setting, not an accessibility setting.
> As mentioned in my reply. "Make everything bigger" (scaling) is the
> "Ease of Access" settings. Those are accessibility settings.

It's also set in

System > Display > Scale and Layout

Not exclusively an "accessibility" related setting, but a display setting.

>> Let's not confuse the matter by talking about reflow, which has
>> nothing
> to do with 1.4.4
> Sure it does. You even said so yourself when you said "At any
> possible viewport size, a user should be able to resize text up to
> 200% without adverse effects (things being cut off, overlapping...".
> If the page does not reflow properly, that can cause "things being cut
> or "overlapping". I didn't say that 1.4.4 was *only* about reflow,
> but if you don't reflow properly, you can cause 1.4.4 issues.

thing being cut off means they're cut off and you can't get to them.
think overflow:hidden in CSS.

The appearance of scrollbars, rather than reflow, is perfectly fine in light
of 1.4.4. See for instance the understanding doc
https://www.w3.org/WAI/WCAG21/Understanding/resize-text.html under

"A user uses a zoom function in his user agent to change the scale of the
content. All the content scales uniformly, and the user agent provides
scroll bars, if necessary."

This is exactly why there was a need for an additional 1.4.10 SC for reflow.

Patrick H. Lauke

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