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Re: Proposal: Canvas accessibility and a media querries approach for alternative content (Action Item 6 in the HTML Accessibility Task Force)

From: James Craig <jcraig@apple.com>
Date: Thu, 14 Jan 2010 10:45:45 -0800
Cc: David Singer <singer@apple.com>, Richard Schwerdtfeger <schwer@us.ibm.com>, "public-canvas-api@w3.org" <public-canvas-api@w3.org>, public-html@w3.org
Message-Id: <E0E5011B-522B-4627-A90F-C92E0D2D2FD2@apple.com>
To: Ian Hickson <ian@hixie.ch>
On Jan 13, 2010, at 6:31 PM, Ian Hickson wrote:

> In your scenario, it's clear that users with visual UAs are catered for, 
> whether they need ATs to help with poor eyesight, ATs to help with poor 
> motor controls, or other needs. However, it isn't clear to me how it 
> handles users with no sight at all.

The fallback contents of a graphing application could be the editable data grid whose values are synced with the values rendered in the graph. Leaving the visual rendering visible would allow blind and sighted co-workers to collaborate. For example, if I use my mouse to update the sine curve on a visible graph, the bound value updates in the shadow DOM, allowing my blind co-worker, Bob, to perceive that value. Likewise, if he updates a value in the data grid, I can perceive that change as a visible re-rendering of the chart. If this example sounds like a hypothetical stretch to you, you'd be really surprised at how adept many screen reader users are.

Received on Thursday, 14 January 2010 18:46:19 UTC

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