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Action-630 revised

From: Jim Allan <jimallan@tsbvi.edu>
Date: Wed, 30 May 2012 11:56:28 -0500
Message-ID: <CA+=z1WmVV51a=ubJheSc==Y1-1W5O3TpS1kbgbaZLOYdx_9vRg@mail.gmail.com>
To: WAI-ua <w3c-wai-ua@w3.org>
Action-630 revised.
We discussed this on May 17 [1], but never reached any resolution. I
have taken the discussion and various emails and crafted the
following:
Proposed
1.8.z Maintain Point of Regard: The point of regard remains at the
same relative location within the visible portion of the viewport when
any or all of the following are true:
(a) the viewport is resized; or
(b) the zoom/scale on the viewport is changed; or
(c) the formatting of some or all of the content changes (e.g. font or
text size, causing content to change height and/or rewrap).
UNLESS there is focused or selected content INSIDE the pre-zoomed
viewport, in which case the focused/selected content remains in the
post-zoom viewport.

Intent:  It can be disorienting and confusing when a user changes the
viewport size or zooms the content and the current content shifts out
of the viewport causing different content on the same page to be
displayed in the viewport. Just as the location in audio does not
change when the user increases the volume, the current point of regard
should not change when the user changes the size of the window or
zooms the content.
Starting with the base assumption that regardless of other items that
may have focus, or be selected, the current viewport is that
information which is visible to the user within the bounds of the user
agent content area. When any of the SC conditions are met, the user
agent should maintain the same top-left (top-right for RTL) corner
UNLESS there is focused or selected content INSIDE the pre-zoomed
viewport, in which case the focused/selected content remains in the
post-zoom viewport. {repeated for emphasis}

Note: "Content" and "selected" are used because there may be cases
where the viewport is zooming into just part of an element (e.g. if I
select a few words of text that are part of a <p> and zoom in)

Intent of Success Criterion 1.8.z
-- Jorge is a low vision user. While viewing a webpage he sees a
picture with a caption that is too small to read. He highlights the
caption, then uses the browsers zoom feature to increase the size of
the content so he can read the caption. Through the zooming process
the highlighted caption remains in the viewport, allowing Jorge to
keep oriented on the caption and begin reading it when the appropriate
content size is reached.
Later while reading on a page, Jorge finds some text that is too large
to read. The beginning of the large text is at the top of the bowser
content area. He uses the zoom feature to make the content smaller.
the text is reduced to a confortable reading size and the beginning of
the text remains at the top of the browser window.
-- Melissa has a distraction disorder. She is doing research for
school. She scrolls the content so the relevant section heading the
top line of the browser. She resizes the browser so she can see her
notes and the browser at the same time. After resizing the browser the
heading is still the top line of the viewport.
-- Xu has a reading disability. He needs only the text on a page to be
larger. He is reading a page with footnotes that are too small to
read. Xu places the footnote at the top of the browser, and using the
increase font-size feature, he increases the font-size of the text on
the page. The footnotes stay on the top of the viewport.


reworded the definition...changed the order of the examples to put
graphical window first. added reference to this proper SC

New definition:
point of regard
The point of regard is the portion of rendered content that the user
is presumed to be viewing. The dimensions of the point of regard may
vary. For example, it may be a two-dimensional area (e.g. content
rendered through a two-dimensional graphical viewport), or a point
(e.g. a moment during an audio rendering or a cursor position in a
graphical rendering), or a range of text (e.g. focused text). The
point of regard is almost always within the viewport, but it may
exceed the spatial or temporal dimensions of the viewport (see the
definition of rendered content for more information about viewport
dimensions).
The point of regard may also refer to a particular moment in time for
content that changes over time (e.g. an audio-only presentation).
User agents may determine the point of regard in a number of ways,
including, based on viewport position in content, keyboard focus, and
selection. The stability of the point of regard is addressed by 1.8.z
----
1. http://lists.w3.org/Archives/Public/w3c-wai-ua/2012AprJun/0071.html

-- 
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 Wednesday, 30 May 2012 16:57:00 GMT

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