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<!DOCTYPE html> <html> <body> <h1>input required 属性</h1> <p>required 属性指定在提交表单之前必须填写一个输入字段。</p> <form action="/action_page.php"> <label for="username">Username:</label> <input type="text" id="username" name="username" required> <input type="submit" value="提交"> </form> <p><strong>注意：</strong> input 标签的 required 属性在 Safari 10.1 之前的版本中不受支持。</p> </body> </html>