W3C home > Mailing lists > Public > public-html-a11y@w3.org > January 2011

[Bug 11240] Canvas support accessible selection position tracking independent of Focus Ring tracking

From: <bugzilla@jessica.w3.org>
Date: Mon, 10 Jan 2011 23:38:50 +0000
To: public-html-a11y@w3.org
Message-Id: <E1PcRK6-0002dL-P4@jessica.w3.org>

Ian 'Hixie' Hickson <ian@hixie.ch> changed:

           What    |Removed                     |Added
             Status|NEW                         |RESOLVED
                 CC|                            |ian@hixie.ch
         Resolution|                            |WONTFIX

--- Comment #3 from Ian 'Hixie' Hickson <ian@hixie.ch> 2011-01-10 23:38:50 UTC ---
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Status: Rejected
Change Description: no spec change

I've rejected this proposal on the following multiple independent grounds:

* I couldn't come up with an API that enough people would use correctly to
justify having the feature. If we have this feature, we need to have some sort
of API that essentially acts like a trojan horse, providing a feature for
authors to use while surreptitiously providing the a11y feature. In other
words, it needs to not be bolt-on accessibility. This is, for example, the
reasoning behind the design of <nav>, of <input type=date>, of drawFocusRing(),
and so on: they provide legitimate features that authors will want to use and
will likely use correctly, with which we can _also_ provide accessibility
features (e.g. skipping navigation, native accessible date controls,
magnification following, etc). Historically, APIs designed exclusively for
accessibility have been a disaster, with most authors ignoring them, and the
remaining authors trying to use them but failing due to lack of testing or
understanding, with the end result being a net harm to accessibility.

* Editing text is not something that we should encourage authors to do using
<canvas>. This is true regardless of accessibility concerns  many native
features get lost in such an implementation.

* Selections are not points, they are non-rectangular disjoint regions, and
their precise rendering varies from platform to platform in ways that would
make such an API difficult to provide. (e.g. on Mac a selection of two lines
each containing one character spans the width of the container, whereas on
Windows it only spans the width of the characters)

* No user agent vendor has indicated an interest in implementing this feature.

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Received on Monday, 10 January 2011 23:38:52 UTC

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