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Root element - HTML: HyperText Markup Language 编辑

The HTML <html> element represents the root (top-level element) of an HTML document, so it is also referred to as the root element. All other elements must be descendants of this element.

Content categories	None.
Permitted content	One `<head>` element, followed by one `<body>` element.
Tag omission	The start tag may be omitted if the first thing inside the `<html>` element is not a comment. The end tag may be omitted if the `<html>` element is not immediately followed by a comment.
Permitted parents	None. This is the root element of a document.
Implicit ARIA role	No corresponding role
Permitted ARIA roles	No `role` permitted
DOM interface	`HTMLHtmlElement`

Attributes

This element includes the global attributes.

manifest: Specifies the URI of a resource manifest indicating resources that should be cached locally. See Using the application cache for details.
version: Specifies the version of the HTML Document Type Definition that governs the current document. This attribute is not needed, because it is redundant with the version information in the document type declaration.
xmlns: Specifies the XML Namespace of the document. Default value is "http://www.w3.org/1999/xhtml". This is required in documents parsed with XML parsers, and optional in text/html documents.

Example

<!DOCTYPE html>
<html lang="en">
  <head>...</head>
  <body>...</body>
</html>

Providing a lang attribute with a valid IETF identifying language tag on the <html> element will help screen reading technology determine the proper language to announce. The identifying language tag should describe the language used by the majority of the content of the page. Without it, screen readers will typically default to the operating system's set language, which may cause mispronunciations.

Including a valid lang declaration on the <html> element also ensures that important metadata contained in the page's <head>, such as the page's <title>, are also announced properly.

Specifications

Specification	Status	Comment
HTML Living Standard The definition of '<html>' in that specification.	Living Standard
HTML5 The definition of '<html>' in that specification.	Recommendation	Added support for the `manifest` attribute (deprecated later). Obsoleted the `version` attribute
HTML 4.01 Specification The definition of '<html>' in that specification.	Recommendation	Deprecated the `version` attribute

Browser compatibility

BCD tables only load in the browser

<html>: The HTML Document / Root element - HTML: HyperText Markup Language 编辑

Attributes

Example

Accessibility concerns

Specifications

Browser compatibility

See also

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<html>: The HTML Document / Root element - HTML: HyperText Markup Language 编辑

Attributes

Example

Accessibility concerns

Specifications

Browser compatibility

See also

如果你对这篇内容有疑问，欢迎到本站社区发帖提问 参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。

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友情链接

如果你对这篇内容有疑问，欢迎到本站社区发帖提问参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。