can anyone help me with the length of maximum characters that can be contain in a normal HTML text box....
Default maxlength is unlimited for a . You may optionally provide this value to constrain input (but there's no guarantees the browser will enforce the rule).
A does not support a maxlength so unlimited characters are accepted for input.
(ref: https://www.w3.org/MarkUp/HTMLPlus/htmlplus_41.html)
RE: Long string breaking during submit
There can be a maximum size to the amount of data submitted from a form when using the method get (the default if not specified). It's only a can because many browsers allow many more characters now. If you use a form with the post method, there is no maximum to the amount of data submitted.