I have not dealt with issues related to the formatting of numbers in other languages that use a , instead of . for the decimal separator. I have looked but I have found no information on how this is handled by field and how it can effect validation. As far as I know php only understands the . as the decimal separator, but I could be wrong as I cannot find any information on this. As far as the browser requiring a , I couldn’t begin to tell you how fix this.
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