I am using a HTML5 input box with type=\"number\". Regarding to some documentations, it should be possible to enter a number with comma (not with period) if I a
actually, if i read the documentation correctly, pattern is not supported for type=number. hence, stick to type=text and then add pattern="..." for the front end validation. in the next step, you will then need to convert the text input into a real number if it wasn't compatible to JavaScript/computing format.
2017 and still no good solution for this common problem...