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Re: Adapting Text Units: Spaces, paragraphs, and ems

From: Laura Carlson <laura.lee.carlson@gmail.com>
Date: Thu, 13 Jul 2017 15:45:53 -0500
Message-ID: <CAOavpveDQJ7gwY1_f8p58U71dWxviGoKhYr24LYugFGgezS-Vg@mail.gmail.com>
To: Alastair Campbell <acampbell@nomensa.com>, "Repsher, Stephen J" <stephen.j.repsher@boeing.com>, "lisa.seeman" <lisa.seeman@zoho.com>, John Foliot <john.foliot@deque.com>, Greg Lowney <gcl-0039@access-research.org>
Cc: public-low-vision-a11y-tf <public-low-vision-a11y-tf@w3.org>, "w3c-wai-gl@w3.org" <w3c-wai-gl@w3.org>
Hi Alastair, Stephen, John, David, Lisa, Greg, and Everyone,

Thank you Alastair!

After reading Alastair's proposal for the paragraph bullet [1], does
anyone think that it is not testable?

Incorporating it into the SC we would have:

<Start SC Text>

If the technologies being used allow the user agent to adapt style
properties of text, then no loss of essential content or functionality
occurs by adapting all of the following:

1. line height (line spacing) to at least 1.5 times the font size.
2. spacing underneath paragraphs to at least 2 times the font size (2 lines).
3. letter spacing (tracking) to at least 0.12 times the font size.
4. word spacing to at least 0.16 times the font size.

Note: Examples of text that are typically not affected by style
properties are open captions and images of text, which are not
expected to adapt.

Editor's note: The Working Group seeks to include overriding text
color, background color, and font-family as part of this SC, but is
not yet able to identify a way to do so that is sufficiently testable.

<End SC Text>

Can anyone not live with that?

Thanks everyone.

Kindest Regards,

[1] https://lists.w3.org/Archives/Public/w3c-wai-gl/2017JulSep/0096.html
On 7/13/17, Alastair Campbell <acampbell@nomensa.com> wrote:
> The paragraphs one is tricky but I think it would be testable if it was
> asking for 2ems (lines) underneath each paragraph.
> 2. Spacing underneath paragraphs to at least 2 times the font size (2
> lines).
> (Is the term “below” or “after” better?)
> Therefore, the answers for each of Stephen’s questions would be:
>   1.  Which paragraph’s font size do I base the spacing on?
> A: The one above the space.
>   2.  Is it spacing before or after or split between the two?
> A: After only.
>   3.  Does a heading or sub-heading count as a paragraph?  Seems like that
> would be a much bigger distinguisher so I’m assuming no.
> A: No. I assume it is a gap in terms of what users would want though?
>   4.  What if a list, block quote, image, or other element breaks up a
> paragraph?  This becomes an important difference depending on the answers to
> 1 and 2.
> A: Then it is two paragraphs, and it shouldn’t break if you add a margin to
> the bottom of each paragraph.
>   5.  If a paragraph has another visual distinction like a first line indent
> or border, is the spacing requirement the same?
> A: Yes (I assume that is the desired requirement).
> The CSS to test it for HTML would simply be:
> p {margin-bottom: 2em !important;}
> Specifying ‘underneath’ also gets around the collapsing margins aspect of
> CSS which I’m sure would raise many questions/issues! (That’s where the
> bottom-margin of one element and the top-margin of next element are not
> simply added together, it uses the higher value of the two and the rest is
> ‘collapsed’.)
> Stephen wrote:
>> In the end though, I’m having a tough time seeing how a test for paragraph
>> spacing could ever really fail in the context of this criterion
> I agree, I’m not sure it’s adding anything of value to end users. Not that
> having lots of spacing between paragraphs is not useful, just that it won’t
> find many issues.
> Cheers,
> -Alastair

Laura L. Carlson
Received on Thursday, 13 July 2017 20:46:21 UTC

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