- From: Steven Faulkner <faulkner.steve@gmail.com>
- Date: Mon, 8 Jun 2009 18:21:23 +0100
- To: HTML WG <public-html@w3.org>
- Cc: W3C WAI-XTECH <wai-xtech@w3.org>, Janina Sajka <janina@rednote.net>
Thinking about canvas accessibility http://www.paciellogroup.com/blog/?p=362 2009/2/18 Steven Faulkner <faulkner.steve@gmail.com>: > The recently released code editor Bespin > (https://bespin.mozilla.com/index.html) is a great example of the utility of > the canvas element, its also a worrying example of the barriers to > accessibility its use will produce. It includes editable text, folder lists > and interactive elements that are all essentially a graphic. there does not > appear to be a way to extract any usable information to support Assistive > technology to interpret or provide interaction. > > The current advice on its use and provision of fallback content seems > somewhat weak given the example of its use in Bespin: > > "Authors should not use the canvas element in a document when a more > suitable element is available. For example, it is inappropriate to use a > canvas element to render a page heading: if the desired presentation of the > heading is graphically intense, it should be marked up using appropriate > elements (typically h1) and then styled using CSS and supporting > technologies such as XBL. > > When authors use the canvas element, they should also provide content that, > when presented to the user, conveys essentially the same function or purpose > as the bitmap canvas. This content may be placed as content of the canvas > element. The contents of the canvas element, if any, are the element's > fallback content." [1] > > Are there plans to provide mechanisms to add accessibility hooks for content > produced using canvas? As providing a secondary accessible version of an > application such as bespin seems like a non starter, and is a prime example > of the sort of "bolt on" accessibility that HTML5 was trying to move away > from. > > [1] http://www.w3.org/TR/html5/the-canvas-element.html#the-canvas-element > > -- > with regards > > Steve Faulkner > Technical Director - TPG Europe > Director - Web Accessibility Tools Consortium > > www.paciellogroup.com | www.wat-c.org > Web Accessibility Toolbar - > http://www.paciellogroup.com/resources/wat-ie-about.html > -- with regards Steve Faulkner Technical Director - TPG Europe Director - Web Accessibility Tools Consortium www.paciellogroup.com | www.wat-c.org Web Accessibility Toolbar - http://www.paciellogroup.com/resources/wat-ie-about.html
Received on Monday, 8 June 2009 17:22:01 UTC