Fwd: PFWG requirements: enable device independent access to event handlers

a bit more for the device independence discussion


---------- Forwarded message ----------
From: Gregory J. Rosmaita <oedipus@hicom.net>
Date: Thu, Oct 7, 2010 at 7:01 PM
Subject: PFWG requirements: enable device independent access to event handlers
To: public-webapps@w3.org, wai-xtech@w3.org, www-dom@w3.org
Cc: jcraig@apple.com, cfleizach@apple.com, schepers@w3.org,
ian@hixie.ch, janina@rednote.net


aloha!

i'm sending the following to inform discussion of device independence
in DOM3 Events and the apple proposal for UI device independence

http://lists.w3.org/Archives/Public/www-dom/2010JulSep/att-0106/UserInterfaceIndependence.html

the contents of the following quote:

http://www.w3.org/WAI/PF/HTML/wiki/Access/event_handler_requirements

has been indirectly referred to the WebApps group by the HTML5 editor
through the bugzilla system, and it is PFWG's desire that these
requirements inform discussion of these documents;

QUOTE
cite="http://www.w3.org/WAI/PF/HTML/wiki/Access/event_handler_requirements"
Note: The first three of the following four [... requirements ...
developed and approved by PFWG ...] were requested by the UAWG and
reviewed by both PFWG the HTML Accessibility Task Force

REQUIREMENT EV1: a user must have the ability to obtain the list of input
device event handlers explicitly associated with an element in a device
independent manner.

   * Explanatory note EV1.1: Users interacting with a web browser may
     be doing so by voice, keyboard, mouse or another input technology
     or a combination of any of these. No matter how the user is
     controlling the user agent, he or she needs to know all the input
     methods assigned to a particular piece of content.


REQUIREMENT EV2: a user must be able to activate any input device event
handlers explicitly associated with an element in a device independent
manner.

   * Explanatory note EV2.1: Although it should not be so designed,
     some Web content is designed to work only with certain input
     devices, such as a mouse, thereby limiting the availability of
     those event handlers to specific devices. Some users interacting
     with a web browser may be doing so by voice, keyboard, mouse or
     another input technology or a combination of any of these. No
     matter how the user is controlling the user agent, he or she must
     be able to activate any of the event handlers regardless of the
     interaction technology being used.

   * Explanatory note EV2.2: A user who cannot use a mouse needs to
     activate a flyout menu that normally appears OnMouseOver. The user
     should be able to navigate to a link and activate it using
     keyboard shortcuts.


REQUIREMENT EV3: a user must be able to simultaneously activate all input
device event handlers explicitly associated with an element in a
device-independent manner.

   * Explanatory note EV3.1: One input method should not hold back
     another. People who don't use a mouse shouldn't necessarily have
     to map their input methods to the same steps a mouse user would
      take.

         * Examples:
               + Speech input users may combine moving the mouse up,
                 left and clicking in a single command phrase.

               + A link has an onmousedown and an onmouseup event
                 link. The keyboard user should be able to use 1 key
                 click to activate both events.


REQUIREMENT EV4: HTML5 must provide a standard way to enumerate the
events on a DOM node and a parallel method to use addEventListener and
removeEventListener to obtain a collection of "events" or an
enumeration function.

   * Explantory Note 1: This is extremely important for analyzing
     web applications for identifying keyboard support for widgets.
UNQUOTE

the above requirements were logged as a bug against HTML5 after review
by the HTML Accessibility Task Force at its 2010-09-30 meeting, but
after comments by one of the HTML WG chairs, have been referred to the
WebApps WG by the HTML5 editor (thank you, hixie):

QUOTE cite="http://www.w3.org/Bugs/Public/show_bug.cgi?id=10896"

Comment 1  Maciej Stachowiak      2010-10-02 05:00:23 UTC

Isn't this an issue for DOM Level 3 Events, not HTML5? HTML5 does not
define the concept of event handlers, it just uses it.

Comment 2  Ian 'Hixie' Hickson 2010-10-07 21:45:07 UTC

Reassigning to DOM Events, since this doesn't seem to be HTML-specific.

Doug: Feel free to reassign back to me if you think this should be dealt
with at the HTML level.
UNQUOTE

so i wanted those to whom this information was referred to have some
context about the event handler device independence issues which will
be discussed across-groups

thank you, gregory.
--------------------------------------------------------------
You cannot depend on your eyes when your imagination is out of
focus.                                           -- Mark Twain
--------------------------------------------------------------
Gregory J. Rosmaita: oedipus@hicom.net
  Camera Obscura: http://www.hicom.net/~oedipus/
         Oedipus' Online Complex: http://my.opera.com/oedipus
--------------------------------------------------------------



-- 
Jim Allan, Accessibility Coordinator & Webmaster

Texas School for the Blind and Visually Impaired

1100 W. 45th St., Austin, Texas 78756

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Received on Wednesday, 20 October 2010 14:30:09 UTC