Dealing with CAPTCHA


show more Dealing with CAPTCHA provides you with in-depth training on Web. Taught by Zoe Gillenwater as part of the Web Accessibility Principles show less
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Dealing with CAPTCHA

>> A CAPTCHA is a distorted image of text or numbers that's commonly placed on forms in order to reduce spam. You'll often see it on registration forms and blog comment forms. The reason it's there is to tell humans and computers apart. A human has to type in what letters or numbers are seen. Spam bots are programs that automatically go out and fill out forms to submit spam. Since they're not humans and cannon see the images, they cannot read them. However there are some spam bots that can read clear images using visual character recognition technology.

That's why the images you are asked to transcribe on forms are so distorted looking. If they were clear and easy to read, spam bots might be able to get through. Of course, the fact that they are so hard to read is a big accessibility concern and they can't be used at all by blind or visually impaired people. A blind person cannot see the image at all. And someone with a serious visual impairment will likely not be ab...

Dealing with CAPTCHA
Video duration: 3m 38s 6h 9m Appropriate for all

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Dealing with CAPTCHA provides you with in-depth training on Web. Taught by Zoe Gillenwater as part of the Web Accessibility Principles

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