In addition, the position is relative to its parent element, not the whole document.
此外，位置是相对于它的父元素，而不是整个文档。
In this code, Html is the object that will encapsulate the whole of the document.
在这段代码中，Html是封装整个文档的对象。
The team needs to submit only one document for the whole team.
每一个小组，整组只需缴交一份作业。
The team needs to submit only one document for the whole team.
每一个小组，整组只需缴交一份作业。
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