HTML - Meta Element

HTML Meta Element Code

title: ## Contents 
style: nestedList # TOC style (nestedList|inlineFirstLevel)
minLevel: 1 # Include headings from the specified level
maxLevel: 4 # Include headings up to the specified level
includeLinks: true # Make headings clickable
debugInConsole: false # Print debug info in Obsidian console

Overview

Sources:

• : The metadata element - HTML: HyperText Markup Language | MDN (mozilla.org)
• https://developer.mozilla.org/en-US/docs/Learn/HTML/Introduction_to_HTML/The_head_metadata_in_HTML

The <meta> HTML element represents metadata that cannot be represented by other HTML meta-related elements, like <base>, <link>, <script>, <style> or <title>.

The type of metadata provided by the <meta> element can be one of the following:

• If the name attribute is set, the <meta> element provides document-level metadata, applying to the whole page.
• If the http-equiv attribute is set, the <meta> element is a pragma directive, providing information equivalent to what can be given by a similarly-named HTTP header.
• If the charset attribute is set, the <meta> element is a charset declaration, giving the character encoding in which the document is encoded.
• If the itemprop attribute is set, the <meta> element provides user-defined metadata.

Attributes

This element includes the global attributes.

Note: the attribute name has a specific meaning for the <meta> element, and the itemprop attribute must not be set on the same <meta> element that has any existing name, http-equiv or charset attributes.

charset

This attribute declares the document’s character encoding. If the attribute is present, its value must be an ASCII case-insensitive match for the string "utf-8", because UTF-8 is the only valid encoding for HTML5 documents. <meta> elements which declare a character encoding must be located entirely within the first 1024 bytes of the document.

content

This attribute contains the value for the http-equiv or name attribute, depending on which is used.

http-equiv

Defines a pragma directive. The attribute is named http-equiv(alent) because all the allowed values are names of particular HTTP headers:

• content-security-policy Allows page authors to define a content policy for the current page. Content policies mostly specify allowed server origins and script endpoints which help guard against cross-site scripting attacks.

• content-type Declares the MIME type and the document’s character encoding. The content attribute must have the value "text/html; charset=utf-8" if specified. This is equivalent to a <meta> element with the charset attribute specified and carries the same restriction on placement within the document. Note: Can only be used in documents served with a text/html — not in documents served with an XML MIME type.

• default-style Sets the name of the default CSS style sheet set.

• x-ua-compatible If specified, the content attribute must have the value "IE=edge". User agents are required to ignore this pragma.

• refresh This instruction specifies:

  • The number of seconds until the page should be reloaded - only if the content attribute contains a non-negative integer.
  • The number of seconds until the page should redirect to another - only if the content attribute contains a non-negative integer followed by the string ‘;url=’, and a valid URL.

  Warning:

  Pages set with a refresh value run the risk of having the time interval being too short. People navigating with the aid of assistive technology such as a screen reader may be unable to read through and understand the page’s content before being automatically redirected. The abrupt, unannounced updating of the page content may also be disorienting for people experiencing low vision conditions.

  • MDN Understanding WCAG, Guideline 2.2 explanations
  • MDN Understanding WCAG, Guideline 3.2 explanations
  • Understanding Success Criterion 2.2.1 | W3C Understanding WCAG 2.0
  • Understanding Success Criterion 2.2.4 | W3C Understanding WCAG 2.0
  • Understanding Success Criterion 3.2.5 | W3C Understanding WCAG 2.0

name

The name and content attributes can be used together to provide document metadata in terms of name-value pairs, with the name attribute giving the metadata name, and the content attribute giving the value.

See standard metadata names for details about the set of standard metadata names defined in the HTML specification.

Examples

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<meta charset="utf-8" />

<!-- Redirect page after 3 seconds -->
<meta http-equiv="refresh" content="3;url=https://www.mozilla.org" />

Technical summary

Content categories	Metadata content. If the itemprop attribute is present: flow content, phrasing content.
Permitted content	None; it is a void element.
Tag omission	Must have a start tag and must not have an end tag.
Permitted parents	- <meta charset>, <meta http-equiv>: a <head> element. If the http-equiv is not an encoding declaration, it can also be inside a <noscript> element, itself inside a <head> element. - <meta name>: any element that accepts metadata content. - <meta itemprop>: any element that accepts metadata content or flow content.
Implicit ARIA role	No corresponding role
Permitted ARIA roles	No role permitted
DOM interface	HTMLMetaElement

Specifications

Specification
HTML Standard # the-meta-element

Code Snippet

Details

About

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See Also

• HTML Code
• Hyper Text Markup Language (HTML)
• Cascading Style Sheets (CSS)
• JavaScript Map of Content

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Appendix

Note created on 2024-05-09 and last modified on 2024-05-09.

Backlinks

LIST FROM [[HTML - Meta Element]] AND -"CHANGELOG" AND -"//HTML - Meta Element"

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