我已经在第一个复选框添加了checked属性，为什么提示我的代码未通过：（第一个复选框缺少 checked 属性）
<input checked id="indoor" type="radio" name="indoor-outdoor" value="indoor" checked> Indoor
I’ve edited your post to improve the readability of the code. When you enter a code block into a forum post, please precede it with three backticks to make it easier to read.
You can also use the “preformatted text” tool in the editor (</>) to add the backticks.
我已编辑您的帖子，以提高代码的可读性。在论坛帖子中输入代码块时，请在代码块前面加上三个反引号，以便于阅读。
您也可以使用编辑器中的“预格式化文本”工具 (</>) 添加反引号。
See this post to find the backtick on your keyboard.
Note: Backticks (`) are not single quotes (').
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Please share a link to the step you are working on
请分享您正在进行的步骤的链接。
If you have a question about a specific challenge as it relates to your written code for that challenge and need some help, click the Help button located on the challenge. This button only appears if you have tried to submit an answer at least three times.
如果您对特定挑战有任何疑问，例如与您为该挑战编写的代码相关的问题，并需要帮助，请点击该挑战上的“帮助”按钮。此按钮仅在您尝试提交答案至少三次后才会显示。
The Help button will create a new topic with all code you have written and include a link to the challenge also. You will still be able to ask any questions in the post before submitting it to the forum.
Thank you.
点击“帮助”按钮将创建一个新主题，其中包含您编写的所有代码，并包含指向该挑战的链接。在将帖子提交到论坛之前，您仍然可以在帖子中提问。
谢谢。