Re: Update to 1.4.12 Text Spacing Understanding

+1 to Jim's updates.

Kind Regards,
Laura

On 8/8/19, Jim Allan <jimallan@tsbvi.edu> wrote:
> All,
> A few weeks ago LVTF was asked our opinion on 1.4.12 wording change. We
> thought the current wording was fine and that expanding the Understanding
> document would bring some clarity to the issue. Below are the original
> understanding sections followed by the updated sections with changes in
> bold(@). There were some spelling corrections and some deletions. Attached
> is the track changes view in word format.
>
> Intent
>
> The intent of this Success Criterion (SC) is to ensure that people can
> override text spacing to improve their reading experience. Each of the
> requirements stipulated in the SC's four bullets helps ensure text styling
> can be adapted by the user to suit their needs.
>
> This SC focuses on the ability to increase spacing between lines, words,
> letters, and paragraphs. Any combination of these may assist a user with
> effectively reading text. As well, ensuring users can override author
> settings for spacing also signficantly increases the likelihood other style
> preferences can be set by the user. For example, a user may need to change
> to a wider font family than the author has set in order to effectively read
> text.
> Author Responsibility
>
> This SC does not dictate that authors must set all their content to the
> specified metrics. Rather, it specifies that an author's content has the
> ability to be set to those metrics without loss of content or
> functionality. The author requirement is both to not interfere with a
> user's ability to override the author settings, and to ensure that content
> thus modified does not break content in the manners shown in figures 1
> through 4 in Effects of Not Allowing for Spacing Override.
> Applicability
>
> If the markup-based technologies being used are capable of overriding text
> to the Success Criterion's metrics, then this SC is applicable. For
> instance Cascading Style Sheet/HTML technologies are quite able to allow
> for the specified spacing metrics. Plugin technologies would need to have a
> built-in ability to modify styles to the specified metrics. Currently, this
> SC does not apply to PDF as it is not implemented using markup.
>
> Examples of text that are typically not affected by style properties
> <https://www.w3.org/WAI/WCAG21/Understanding/text-spacing.html#dfn-style-property>
> and
> not expected to adapt are:
>
>    - Video captions embedded directly into the video frames and not
>    provided as an associated caption file
>    - Images of text
>
> <https://www.w3.org/WAI/WCAG21/Understanding/text-spacing.html#dfn-image-of-text>
>
> For this SC, canvas
> <https://www.w3.org/TR/html5/scripting-1.html#the-canvas-element>
> implementations
> of text are considered to be images of text
> <https://www.w3.org/WAI/WCAG21/Understanding/text-spacing.html#dfn-image-of-text>
> .
>
> User Responsibility
>
> The ability to read and derive meaning from the overridden spacing rests
> with the user. If the increased spacing impacts those abilities, the user
> will adjust or they will return to the default view. Regardless, the user
> needs the flexibility to adjust spacing within the bounds set in the SC.
> Such changes may be acheived via user stylesheet, bookmarklet, extension,
> or application.
>
> -------------
>
> Updated Understanding
>
> *Intent*
>
> The intent of this Success Criterion (SC) is to ensure that people can
> override @*author specified@* text spacing to improve their reading
> experience. Each of the requirements stipulated in the SC's four bullets
> helps ensure text styling can be adapted by the user to suit their needs.
>
> *@The specified metrics set a minimum baseline. The values in between the
> author's metrics and the metrics specified in this SC should not have loss
> of content or functionality.@*
>
>
> This SC focuses on the ability to increase spacing between lines, words,
> letters, and paragraphs. Any combination of these may assist a user with
> effectively reading text. As well, ensuring users can override author
> settings for spacing also significantly increases the likelihood other
> style preferences can be set by the user. For example, a user may need to
> change to a wider font family than the author has set in order to
> effectively read text.
>
>
> Author Responsibility
>
> This SC *does not* dictate that authors must set all their content to the
> specified metrics. Rather, it specifies that an author's content has the
> ability to be set to those metrics without loss of content or
> functionality. The author requirement is both to not interfere with a
> user's ability to override the author settings, and to ensure that content
> thus modified does not break content in the manners shown in figures 1
> through 4 in Effects of Not Allowing for Spacing Override. @*The values in
> the SC are a baseline. We want to encourage authors to surpass these, not
> see them as a ceiling to build to. If the user chooses to go beyond the
> SC’s metrics any resulting loss of content or functionality is the users
> responsibility.@*
>
> *Applicability*
>
> If the markup-based technologies being used are capable of overriding text
> to the Success Criterion's metrics, then this SC is applicable. For
> instance Cascading Style Sheet/HTML technologies are quite able to allow
> for the specified spacing metrics. Plugin technologies would need to have a
> built-in ability to modify styles to the specified metrics. Currently, this
> SC does not apply to PDF as it is not implemented using markup.
>
> Examples of text that are typically not affected by style properties
> <https://www.w3.org/WAI/WCAG21/Understanding/text-spacing.html#dfn-style-property>
> and
> not expected to adapt are:
>
> ·         Video captions embedded directly into the video frames and not
> provided as an associated caption file
>
> ·         Images of text
> <https://www.w3.org/WAI/WCAG21/Understanding/text-spacing.html#dfn-image-of-text>
>
> For this SC, canvas
> <https://www.w3.org/TR/html5/scripting-1.html#the-canvas-element>
> implementations
> of text are considered to be images of text
> <https://www.w3.org/WAI/WCAG21/Understanding/text-spacing.html#dfn-image-of-text>
> .
>
>
> User Responsibility
>
> The ability to read and derive meaning from the overridden spacing rests
> with the user. @*The user may choose to exceed the spacing adjustments in
> the SC. If the increased spacing causes loss of content or functionality,
> the user will adjust or return to the author’s original spacing or spacing
> within the bounds of the SC.@ *Regardless, the user needs the flexibility
> to adjust spacing within the bounds set in the SC@ *without loss of content
> or functionality*.@ Such changes may be achieved via user stylesheet,
> bookmarklet, extension, or application.
>
>
> --
> Jim Allan, Accessibility Coordinator
> Texas School for the Blind and Visually Impaired
> 1100 W. 45th St., Austin, Texas 78756
> voice 512.206.9315    fax: 512.206.9452 http://www.tsbvi.edu/
> "We shape our tools and thereafter our tools shape us." McLuhan, 1964
>


-- 
Laura L. Carlson

Received on Thursday, 8 August 2019 17:34:45 UTC