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<!DOCTYPE html> <html> <body> <h1>输入 placeholder 占位符属性</h1> <p>placeholder 属性指定一个简短提示，描述输入字段的预期值。</p> <form action="/action_page.php"> <label for="phone">输入电话号码：</label> <input type="tel" id="phone" name="phone" placeholder="123-45-678" pattern="[0-9]{3}-[0-9]{2}-[0-9]{3}"><br><br> <input type="submit" value="提交"> </form> </body> </html>