return max value of inputs js code example

Example 1: input maxlength

<form action="/action_page.php">
  <label for="username">Username:</label>
  <input type="text" id="username" name="username" maxlength="10"><br><br>
  <input type="submit" value="Submit">
</form>

Example 2: setting max input var

htaccess --> php_value max_input_vars 3000
.php     --> ini_set('max_input_vars', 3000);