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The root element of the html document is the "html" element, which is the outermost element in the HTML document; the purpose of the html element is to tell the browser that the content from the "to" tag is of type HTML, and the browser parses the content by HTML.

The operating environment of this tutorial: windows7 system, HTML5 version, Dell G3 computer.

HTML root element

The root element of an HTML document is the html element, starting with the tag and ending with the tag.

Tags are the outermost elements in an HTML document.

Tags are containers for all other HTML elements (except tags).

The function of the root element is to tell the browser that the content between and is of type HTML, and the browser parses the content by HTML.

The html element has three attributes, namely the lang attribute, the xmlns attribute, and the manifest attribute:

The lang property specifies the default language used by the page content. Specifying the language used by the document helps the language synthesis tool choose the pronunciation language, or the translation tool selects translation rules. For example, indicates that this document is in Chinese.

The xmlns attribute assigns the namespace of the XML. The xmlns attribute is required in XHTML, but not in HTML.

The manifest attribute gives the URL of the offline cache file. HTML5 introduces application caching, which means that web applications can be cached and accessed offline. For example, indicates that the offline cache file is waibo.manifest.

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