You can use the maxlength attribute (which is very well-supported across different browsers) on the HTML <input> element to limit the maximum number of characters that a user can enter. For example:
<input type="text" maxlength="10" />
This would limit the user input in the <input> element to a maximum of 10 characters (as UTF-16 code units).
Please note that if no maxlength is set on the <input> element, or a non-positive integer value is set, then no maximum character limit is imposed.
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