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Re: Transparency and linked objects was Re: javascript dhtml and browser variations

From: Charles McCathieNevile <charles@w3.org>
Date: Sun, 1 Jul 2001 23:16:11 -0400 (EDT)
To: Jonathan Chetwynd <j.chetwynd@btinternet.com>
cc: <w3c-wai-ig@w3.org>
Message-ID: <Pine.LNX.4.30.0107012310300.18810-100000@tux.w3.org>
No, there isn't a W3C javascript group, since w3c isn't developing javascript
- there is a liaison with the ECMAscript people who are developing it.

I think there are two places to look at this - the major one is to think
about content guidelines, and the idea that if something is transparent it is
a bad idea to make that bit clickable (this is generally not too hard in svg
I believe). In making an imagemap in HTML there is provision for doing this,
and there are similar techniques that can be used in SVG where regions that
look unclickable can be marked as not being linked.

I'll take this techique up with the WCAG group too - thanks for pointing out
the problem.



On Sat, 30 Jun 2001, Jonathan Chetwynd wrote:

  Is there a w3c javascript/dhtml working group?

  If one object (which has a transparent area) is placed above another, there
  is a logical inconsistency, in that the user sees themselves clicking one
  object, but is taken to the other object's location.
  http://www.peepo.com/crap/lbv/ (ie5 only) is an example.

  Does anyone know of any workaround?  Who could I write to, in order to get
  matter addressed, it seems fairly fundamental....


  jonathan chetwynd
  IT teacher (LDD)
  http://www.peepo.com         "The first and still the best picture directory
  on the web"

Charles McCathieNevile    http://www.w3.org/People/Charles  phone: +61 409 134 136
W3C Web Accessibility Initiative     http://www.w3.org/WAI    fax: +1 617 258 5999
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Received on Sunday, 1 July 2001 23:16:12 UTC

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