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Re: Action-902 Units of measure for 1.4.3

From: Jim Allan <jimallan@tsbvi.edu>
Date: Tue, 8 Oct 2013 09:59:42 -0500
Message-ID: <CA+=z1Wk3TUZ2ZDo3RDFWX4fGmv4eZ48FFr0F61j2WwH+UVg4oA@mail.gmail.com>
To: Jeanne Spellman <jeanne@w3.org>
Cc: UAWG <w3c-wai-ua@w3.org>
All good for me.


On Mon, Oct 7, 2013 at 5:06 PM, Jeanne Spellman <jeanne@w3.org> wrote:

> I agree that 0 is confusing with O depending on the font, but 0 is a very
> different width from M and that will put us in conflict with CSS which uses
> 0.  I am pretty sure that other technologies also use 0 as the defining
> character for width.  I suggest we put "0 (zero)" in the proposal.
>
>
> On 10/7/2013 5:38 PM, Jim Allan wrote:
>
>> References (for 1.4.3 in IER)
>> http://www.w3.org/TR/CSS2/**visudet.html#leading<http://www.w3.org/TR/CSS2/visudet.html#leading>
>>   http://www.w3.org/wiki/CSS/**Properties/line-height<http://www.w3.org/wiki/CSS/Properties/line-height>
>> http://www.w3.org/TR/CSS2/**text.html#spacing-props<http://www.w3.org/TR/CSS2/text.html#spacing-props>
>> http://www.w3.org/TR/CSS2/**fonts.html#font-styling<http://www.w3.org/TR/CSS2/fonts.html#font-styling>
>> http://www.w3.org/TR/CSS2/**fonts.html#font-boldness<http://www.w3.org/TR/CSS2/fonts.html#font-boldness>
>> http://www.w3.org/TR/CSS2/**text.html#lining-striking-**props<http://www.w3.org/TR/CSS2/text.html#lining-striking-props>
>> http://www.w3.org/TR/CSS2/**text.html#alignment-prop<http://www.w3.org/TR/CSS2/text.html#alignment-prop>
>>
>> Table of all CSS properties http://www.w3.org/TR/CSS2/**propidx.html<http://www.w3.org/TR/CSS2/propidx.html>
>>
>> adding a Note to 1.4.3
>> Note: The unit of measure will vary by the technology. For the purposes of
>> UAAG 2.0, the font height should be considered to be equal to 1. The font
>> width of the character M (or other character commonly accepted in the
>> typography for that language) should be considered to be equal to 1.
>>
>> <jim in the note, 0 was confusing (as it is a zero, not an O), I changed
>> to
>> an M
>> I added the word and character spacing, justification, bold, etc
>> references>
>>
>> any other comments, additions, smithing???
>>
>>
>> On Fri, Oct 4, 2013 at 2:22 PM, Jeanne Spellman <jeanne@w3.org> wrote:
>>
>>  As per my action item, I followed up on the text customization proposal
>>> to
>>> see what unit of measure was intended for 1.4.3 on line height (leading),
>>> character and word spacing.
>>>
>>> Results:  No unit of measure was specified deliberately, because no unit
>>> of measure is proper usage. Examples were given of CSS and Word, which
>>> both
>>> accept a number without a unit of measure.
>>>
>>> I personally disagree with this. While my typography experience is quite
>>> dated, I have always used a unit of measure in typography.  While this
>>> (no
>>> unit of measure) is allowed in CSS, the examples make clear that CSS2
>>> considers no unit of measure as em. The calculation of line-height in CSS
>>> 2.1 is quite complex, and I think we should avoid it ourselves, and refer
>>> people to appropriate documentation.
>>> http://www.w3.org/TR/CSS2/****visudet.html#leading<http://www.w3.org/TR/CSS2/**visudet.html#leading>
>>> <http://**www.w3.org/TR/CSS2/visudet.**html#leading<http://www.w3.org/TR/CSS2/visudet.html#leading>
>>> >
>>>
>>>
>>> References (which I think we should include in the References section of
>>> 1.4.3 IER)
>>> http://www.w3.org/TR/CSS2/****visudet.html#leading<http://www.w3.org/TR/CSS2/**visudet.html#leading>
>>> <http://**www.w3.org/TR/CSS2/visudet.**html#leading<http://www.w3.org/TR/CSS2/visudet.html#leading>
>>> >
>>>   http://www.w3.org/wiki/CSS/****Properties/line-height<http://www.w3.org/wiki/CSS/**Properties/line-height>
>>> <http://**www.w3.org/wiki/CSS/**Properties/line-height<http://www.w3.org/wiki/CSS/Properties/line-height>>(some
>>> useful language here, IMO.)
>>> Table of all CSS properties http://www.w3.org/TR/CSS2/****propidx.html<http://www.w3.org/TR/CSS2/**propidx.html>
>>> <http://www.w3.**org/TR/CSS2/propidx.html<http://www.w3.org/TR/CSS2/propidx.html>
>>> >
>>>
>>> The spec for CSS3 is not complete and should not be referenced.  The
>>> latest working draft (for your info) is http://www.w3.org/TR/css3-**
>>> text/#word-spacing <http://www.w3.org/TR/css3-**text/#word-spacing<http://www.w3.org/TR/css3-text/#word-spacing>
>>> >
>>>
>>>
>>> I propose adding a Note to 1.4.3
>>> Note: The unit of measure will vary by the technology. For the purposes
>>> of
>>> UAAG 2.0, the font height should be considered to be equal to 1. The font
>>> width of the character 0 (or other character commonly accepted in the
>>> typography for that language) should be considered to be equal to 1.
>>>
>>>
>>>
>>
>>
> --
> ______________________________**_
> Jeanne Spellman
> W3C Web Accessibility Initiative
> jeanne@w3.org
>
>


-- 
Jim Allan, Accessibility Coordinator & Webmaster
Texas School for the Blind and Visually Impaired
1100 W. 45th St., Austin, Texas 78756
voice 512.206.9315    fax: 512.206.9264  http://www.tsbvi.edu/
"We shape our tools and thereafter our tools shape us." McLuhan, 1964
Received on Tuesday, 8 October 2013 15:00:26 UTC

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