<!DOCTYPE html>
<html>
<body>
<h1>The input pattern attribute</h1>
<p>A form with a password field that must contain 8 or more characters:</p>
<form action="/action_page.php">
<label for="pwd">Password:</label>
<input type="password" id="pwd" name="pwd" pattern=".{8,}" title="Eight or more characters">
<input type="submit">
</form>
</body>
</html>