What if I have a captcha that displays a series of English characters. Will people who don't speak English have trouble interpreting and/or typing these characters? If this is the case then what is the best solution for an internationalized captcha?
Google explains that a CAPTCHA can be triggered by automated processes sometimes caused by worms, proxy search traffic going through infected computers or DSL routers, or from some SEO ranking tools.
Text-based, picture-based, and sound-based CAPTCHAs are the three types of CAPTCHAs available today.
The problem with CAPTCHAs is that they are not accessible to all types of users, which mean that some users will not be able to complete the form on the website. For example, an image-based CAPTCHA can be very difficult or impossible to complete for users who are blind or have low-vision.
We're usually holding the camera; our body is inherently involved in framing the view. But CAPTCHA photos were taken to train self-driving cars, so they were shot from the vantage-point of cameras mounted on Google's Waymo experimental vehicles.
Since 99% of the URLs are in regular ASCII, I don't think you will have a problem..after all how would they get to Google or Yahoo if they couldn't type the URL
That said I have on occasion run across Chinese characters used in captchas
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