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Re: Operable with Keyboard only provision - Revised version based on comments in WCAG and in TEITAC

From: Andi Snow-Weaver <andisnow@us.ibm.com>
Date: Mon, 7 May 2007 15:15:00 -0500
To: "w3c-wai-gl@w3.org" <w3c-wai-gl@w3.org>
Message-ID: <OF1E9C1162.1BD8777F-ON862572D4.006F1FE4-862572D4.006F3CB9@us.ibm.com>



I suggest modifying "path of the user's movement" to "path of the pointer
movement".

Andi



                                                                           
             Gregg                                                         
             Vanderheiden                                                  
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                                       Operable with Keyboard only         
             05/06/2007 01:45          provision - Revised version based   
             PM                        on  comments in WCAG and in TEITAC  
                                                                           
                                                                           
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New version for comment




2.1.1 Keyboard: All functionality of the content is operable through a
keyboard interface without requiring specific timings for individual
keystrokes, except where the underlying function requires input that
depends on the path of the user's movement and not just the endpoints.
(Level A)


Note: This exception relates to the underlying function, not the input
technique. For example, if using handwriting to enter text, the input
technique (handwriting) requires path dependent input but the underlying
function (text input) does not.


Note: This does not forbid and should not discourage providing mouse input
or other input methods in addition to keyboard operation.











Modified Intent of UNDERSTANDING  2.1.1:


The intent of this success criterion is to ensure that, wherever possible,
content can be operated through a keyboard or keyboard interface. When
content can be operated through a keyboard or alternate keyboard, it is
operable by people with no vision (who cannot use devices such as mice that
require eye-hand coordination) as well as by people who must use alternate
keyboards or input devices that act as keyboard emulators. Keyboard
emulators include speech input software, sip-and-puff software, on-screen
keyboards, scanning software and a variety of assistive technologies and
alternate keyboards. Individuals with low vision also may have trouble
tracking a pointer and find the use of software much easier (or only
possible) if they can control it from the keyboard


Examples of "specific timings for individual keystrokes" include situations
where a user would be required to repeat or execute multiple keystrokes
within a short period of time or where a key must be held down for an
extended period before the keystroke is registered. [LC-1164]


The phrase "except where the underlying functionality requires path
dependent input" is included to separate those things that cannot
reasonably be controlled from a keyboard.


Most actions carried out by a pointing device can also be done from the
keyboard (for example, clicking, selecting, moving, sizing). However, there
is a small class of input that is done with a pointing device that cannot
be done from the keyboard in any known fashion without requiring an
inordinate number of keystrokes. Free hand drawing, watercolor painting,
and flying a helicopter through an obstacle course are all examples of
functions that require path dependent input. Drawing straight lines,
regular geometric shapes, re-sizing windows and dragging objects to a
location (when the path to that location is not relevant) do not require
path dependent input.


The use of MouseKeys would not satisfy this success criterion because it is
not a keyboard equivalent to the application; it is a mouse equivalent
(i.e. it looks like a mouse to the application).


Gregg

------------------------
Gregg C Vanderheiden Ph.D.
Professor - Depts of Ind. Engr. & BioMed Engr.
Director - Trace R & D Center
University of Wisconsin-Madison
<http://trace.wisc.edu/> FAX 608/262-8848
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Received on Monday, 7 May 2007 20:21:29 GMT

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