It's possible to use a combination of HTML element and CSS to create a tree structure.

联合使用HTML元素和CSS创建一个树形结构是可行的。

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The answer to this problem — at least, the answer chosen by today's Web browsers — is to use a tree structure to represent HTML.

这个问题的答案(至少是由当今Web浏览器选择的答案)是使用树结构来表示HTML。

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It can also be thought of as parsing out chunks of information from a page. Web pages are coded in HTML, which uses a tree-like structure to represent the information.

页面抓取本质上是HTML页面的反向工程，也可以看成页面解释器，网页以HTML编码，HTML以树型结构表示信息，实际数据与布局代码以及效果信息混杂在一起，不能被计算机直接利用。

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