<html>
<body>
<form action="demo-form.php">
E-mail: <input type="email" name="userid"><br>
<input type="submit" value="Submit"><br>
<input type="submit" formnovalidate="formnovalidate" value="Submit without validation">
</form>
<p><strong>注意：</strong> Internet Explorer 9及更早IE版本,或Safari不支持input标签的 formnovalidate 属性。</p>
</body>
</html>