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Re: Media--Technical Implications of Our User Requirements

From: Janina Sajka <janina@rednote.net>
Date: Mon, 19 Jul 2010 16:37:30 -0400
To: public-html-a11y@w3.org
Message-ID: <20100719203729.GF2478@sonata.rednote.net>
A further comment re granularity control and navigation by structure ...

If one has random access to a TOC, or a map of nav points such as a TOC
represents, there's arguably little need of a granularity control. It's
not for the mouse user.

Granularity control matters for the user who must sequentially walk
through nav points--especially if they must also pause to hear what the
nav point they've come to is. The problem, of course, is to provide user
control that permits large movement, and fine movement, as may be
useful, thus avoiding the inevitable problem of too many or too few nav
points when these are hard-locked in advance.

Please consider the following in this light. hth.

Janina Sajka writes:
> Philip Jägenstedt writes:
> > >Next and Previous (structural navigation)
> > >Granularity Adjustment Control (Structural Navigation)
> > 
> > I don't really understand what this is. Would the API be something
> > like nextChapter()?
> OK. Let me try again.
> Let chapters be represented by x. Let sections within chapters be
> represented by y. Let subparts of sections be represented by z.
> So, now we have three levels, and content of schema x.y.z .
> If set at level 2, next and previous would access any x or y, but would
> ignore z.
> At level 1 they'd ignore y and z, and access only x.
> At level 3 they'd access any x, y or z--whichever was next (or
> previous).
> The granularity control is the control that allows users to shift among
> levels one, two, and three. The consequences of next and previous are
> defined, as above, by what granularity level the user selects.
> Does this help? Please reconsider the Dante example in the user reqs.


Janina Sajka,	Phone:	+1.443.300.2200

Chair, Open Accessibility	janina@a11y.org	
Linux Foundation		http://a11y.org

Chair, Protocols & Formats
Web Accessibility Initiative	http://www.w3.org/wai/pf
World Wide Web Consortium (W3C)
Received on Monday, 19 July 2010 20:38:01 UTC

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