[lang] attributes have a valid value
Language codes on page elements are valid so screen readers pronounce content correctly.
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Impact
About
Specifying a valid [BCP 47 language](https://www.w3.org/International/questions/qa-choosing-language-tags#question) on elements helps ensure that text is pronounced correctly by a screen reader. [Learn how to use the lang attribute](https://dequeuniversity.com/rules/axe/4.10/valid-lang).
Risks
Screen readers mispronounce content, confusing users.
Why it's important
Helps screen readers pronounce content correctly by identifying the language of the page and its elements.
User stories
As a screen reader user, I want the page language to be correctly identified so that content is pronounced properly.
Code
Failing pattern:
<!-- Fail: invalid BCP 47 value -->
<p lang="english">This paragraph is in English.</p>
Passing pattern:
<!-- Pass: valid BCP 47 codes -->
<p lang="en">This paragraph is in English.</p>
<p lang="es">Este párrafo está en español.</p>
Error
ScanGov messaging when a site fails a standard:
Failed: [lang] attributes have a valid value
Guidance
Indicators
Related
- [accesskey] values are unique
- [aria-*] attributes match their roles
- Uses ARIA roles only on compatible elements
- button, link, and menuitem elements have accessible names
- ARIA attributes are used as specified for the element's role
- Deprecated ARIA roles were not used
- Elements with role="dialog" or role="alertdialog" have accessible names
- [aria-hidden="true"] is not present on the document <body>
- [aria-hidden="true"] elements do not contain focusable descendents
- ARIA input fields have accessible names
- ARIA meter elements have accessible names
- ARIA progressbar elements have accessible names
- Elements use only permitted ARIA attributes
- [role]s have all required [aria-*] attributes
- Elements with an ARIA [role] that require children to contain a specific [role] have all required children
- [role]s are contained by their required parent element
- [role] values are valid
- Elements with the role=text attribute do not have focusable descendents
- ARIA toggle fields have accessible names
- ARIA tooltip elements have accessible names
- ARIA treeitem elements have accessible names
- [aria-*] attributes have valid values
- [aria-*] attributes are valid and not misspelled
- Buttons have an accessible name
- The page contains a heading, skip link, or landmark region
- Background and foreground colors have a sufficient contrast ratio
- <dl>'s contain only properly-ordered <dt> and <dd> groups, <script>, <template> or <div> elements
- Definition list items are wrapped in <dl> elements
- Document has a <title> element
- ARIA IDs are unique
- No form fields have multiple labels
- <frame> or <iframe> elements have a title
- Heading elements appear in a sequentially-descending order
- <html> element has a [lang] attribute
- <html> element has a valid value for its [lang] attribute
- <html> element has an [xml:lang] attribute with the same base language as the [lang] attribute
- Image elements have [alt] attributes
- Image elements do not have [alt] attributes that are redundant text
- Input buttons have discernible text
- <input type="image"> elements have [alt] text
- Form elements have associated labels
- Links are distinguishable without relying on color
- Links have a discernible name
- Lists contain only <li> elements and script supporting elements (<script> and <template>)
- List items (<li>) are contained within <ul>, <ol> or <menu> parent elements
- The document does not use <meta http-equiv="refresh">
- [user-scalable="no"] is not used in the <meta name="viewport"> element and the [maximum-scale] attribute is not less than 5
- <object> elements have alternate text
- Select elements have associated label elements
- Skip links are focusable
- No element has a [tabindex] value greater than 0
- Tables have different content in the summary attribute and <caption>
- Touch targets have sufficient size and spacing
- Cells in a <table> element that use the [headers] attribute refer to table cells within the same table
- <th> elements and elements with [role="columnheader"/"rowheader"] have data cells they describe
- <video> elements contain a <track> element with [kind="captions"]
- All heading elements contain content
- Identical links have the same purpose
- Document has a main landmark
- Elements with visible text labels have matching accessible names
- Tables use <caption> instead of cells with the [colspan] attribute to indicate a caption
- <td> elements in a large <table> have one or more table headers
- Image aspect ratio
- Valid doctype
- Character encoding
- Accessibility grades on Project ScanGov
- ScanGov Accessibility
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