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I have an input field whose name is an MD5 string e.g.:
<input type="hidden" name="7815696ecbf1c96e6894b779456d330e" value="1">
Now I understand that having a number as the first letter in an input field name is generally bad practice, but are there any side-effects to this such as a certain browser won’t send it in the POST request?
An ID attribute would have had to begin with a letter as per the HTML 4.01 W3C specification, however since the NAME attribute of input elements is of CDATA type (Source), this restriction does not apply.
One real restriction you get on NAME attributes is when you submit a form with the GET method, because in this case, form data must be restricted to ASCII codes (Source).