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Re^3: Another way to get around automated botsby adrianh (Chancellor) |
on May 05, 2004 at 16:30 UTC ( [id://350837]=note: print w/replies, xml ) | Need Help?? |
I guess I should consider myself fortunate that I don't ever have to program for that - every application I have written has been for an environment where sight is assumed. I'd be careful about those assumptions (disclaimer: people pay me for accessibility work :-) For government or government funded sites in the UK, US and in other countries accessibility is a major issue - contractually or legally depending on locale. For business sites it's becoming a potential legal/PR minefield. The advantage over using an image is that it can't be scanned by a bot and read. Yes it can. Automating a web browser and a screen grab program isn't hard. With a little more effort they can just parse and interpret the HTML directly. The question is - is it worth the effort for somebody to do this on your site. The WAI have a nice working paper on the topic Inaccessibility of Visually-Oriented Anti-Robot Tests for those who are interested in the topic. Personally I have found heuristic server-side solutions much more effective. For example:
Depending on your application it may be worth thinking how much a captured registration is worth in the currency of your choice, and then thinking about how many registrations a minimum wage worker could make on your site in an hour. If the math comes out the wrong way you're going to have to rethink anyway.
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