ARIA IDs are unique

The value of an ARIA ID must be unique to prevent other instances from being overlooked by assistive technologies. [Learn how to fix duplicate ARIA IDs](https://dequeuniversity.com/rules/axe/4.10/dupl

Indicators

Accessibility

Impact

(How ScanGov measures tasklist priorities.)

About

Why it's important

Ensures assistive technologies like screen readers can correctly interpret and announce page elements to users with disabilities.

User stories

As a screen reader user, I want ARIA attributes to be correctly implemented so that I can understand the purpose and state of interactive elements.

Error

(ScanGov messaging when a site fails a standard)

Failed: ARIA IDs are unique

Guidance

Web Content Accessibility Guidelines (WCAG)

[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
[lang] attributes have a valid value
<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