Headine with the h2 Element#

Over the next few challenges, we'll build an HTML 5 app that will look something like this:
完成接下来的挑战后，我们将构造出一个如下图所示的HTML 5 app。

The h2 element you enter will create an h2 element on the website.
在网页中输入一个<h2>标签来生成h2元素。

This element tells the browser about the structure of your website. h1 elements are often used for main headings, while h2 elements are generally used for subheadings. There are also h3, h4, h5 and h6 elements to indicate different and new sections.
浏览器可以通过这个元素知道网页的结构。主标题通常使用h1元素，同时副标题通常使用h2元素。还有使用h3-h6来表示其他分层结构。

Add an h2 tag that says "CatPhotoApp" to creat a second HTML element below your "Hello World" h1 element.
在你的h1标签："Hello World"的下方添加一个名为"CatPhotoApp"的h2标签。

• Create an h2 element.
• 创建一个h2标签。
• Make sure your h2 element has a closing tag.
• 确保你的h2代码含有相应的关闭标签。
• Your h2 element should have the text "CatPhotoApp".
• 你的h2代码中需含有"CatPhotoApp"文本。
• Your h1 element should have the text "Hello World".
• 你的h1代码中需含有"Hello World"文本。

<h1>Hello World</h1>
<h2>CatPhotoApp</h2>