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Re: Does 1.4.10 essentially replace 1.4.4?

for

From: glen walker
Date: Sep 5, 2021 11:22AM

Thanks Birkir and Patrick. I understand the fundamentals of both success
criteria. My question was more academic in nature. If you want to conform
to WCAG 2.1 AA then you must pass 1.4.10. If you pass 1.4.10, doesn't that
(mostly) imply you also pass 1.4.4 so there's no need to test for 1.4.4?

If you look good at 400% (and you only have one scrollbar) then you'll
probably look good at 200% (regardless of scrollbars).

We can create examples where this isn't true, of course, such as Patrick's
example in https://patrickhlauke.github.io/wcag-interpretation/?full#58

> if you zoom to exactly 320 CSS px width / 256 CSS px height

That's another aspect that isn't completely clear (to me). 1.4.10 doesn't
really say that *both* the width and height must be set. It just says that
vertical scrolling content (such as English, German, Spanish, etc) doesn't
require scrolling in two dimensions when at (exactly) 320 CSS px width. It
doesn't say I must set the height too.

Same with horizontal scrolling content (such as Mandarin, Korean, Arabic).
The requirement refers to setting the height to 256 CSS px but doesn't say
I must set the width too.

Conceptually, if you think of the vertical scrolling case, if you don't
have a horizontal scrollbar then you're good for 1.4.10 and since you're
scrolling vertically, it doesn't really matter what the height of the
browser is.