> -----Original Message----- > From: David Dorward > Sent: Thursday, 15 February 2007 8:21 a.m.
> On Wed, Feb 14, 2007 at 06:54:35PM +0000, James Crooke wrote: > > I disagree, Captchas are accessible - providing you supply an audio > > alternative of course. > > Try that on a device which only has braille output. Or with a person who is deafblind, or has any degree of both vision and hearing impairment (most people over 50?). The whole point of captchas is to try and distinguish between humans and machines. If you build a captcha that assumes that the difference between a human and a machine is the sense of sight (and/or hearing), you will by definition lock out those humans who have sensory impairments (and who rely on machines to interpret the information that their impaired senses would have otherwise obtained, and convert it into a different format or sensory input). Moira Clunie Accessible Formats Developer Royal New Zealand Foundation of the Blind Awhina House, 4 Maunsell Road, Newmarket, Auckland Private Bag 99941, Newmarket, Auckland DDI +64 9 355 6938 Fax +64 9 355 6960 [EMAIL PROTECTED] ******************************************************************* List Guidelines: http://webstandardsgroup.org/mail/guidelines.cfm Unsubscribe: http://webstandardsgroup.org/join/unsubscribe.cfm Help: [EMAIL PROTECTED] *******************************************************************
