For the purpose of this exercise, assume that you can't find out by reading the source code the type of component used as the text area in the HTML editor.
出于本练习的需要，假定您不能通过阅读源码查明在HTML编辑器中用作文本区域的组件的类型。
Open the HTML file in a text editor and copy the HTML source code to the clipboard .
在文本编辑器中打开HTML格式的文件，然后复制所需的代码。
Indicates a comment that is not displayed. Prevents any enclosed text or HTML source code from being parsed and displayed in the browser window.
表示不可见的注释。防止所包含的文本或者HTML源代码被浏览器解析和显示。
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