该文档为英文文档，文档可以用于web开发中查找HTML和Javascr ipt和dom树的具体用法，方法说明，和相关的示例，该文档是web开发人员的必备API，查询方便，支持模糊查询，重要的是内容丰富详尽。-The document in English documents, the document can be used for web development in HTML and Javascr ipt to find dom tree and the specific usage, descr iption, and related examples, the document is an essential web developer API, to facilitate inquiry in support of fuzzy information, rich in content is important that detailed.