University of Michigan

Privacy Statement › University of Michigan

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404: Page Not Found › University of Michigan

When specifying accessible names via `aria-labelledby`, ensure that the 
label elements exist.

## Explanation

Accessible names are required for many parts of a page, including form controls.
One way to accomplish this is to use `aria-labelledby` to specify the ID or IDs of 
other elements which contain a label. For example:

```html
<h2 id="dialog-labell">Important message!</h2>
<dialog aria-labelledby="dialog-label">
```

In this example, the `aria-labelledby` for the `<dialog>` points to an ID of `dialog-label`,
which doesn't exist. The heading it refers to instead has an ID of `dialog-labell`, presumably 
a typo.

## Why this matters

It isn't usually clear when an accessible name is broken, even during user testing.

This check helps to identify where an element clearly intended to have a label, but
that label is missing.

When a label is broken, it may be impossible for a user of assistive technologies
to understand what that element does.

missing-aria-labelled-by

February 2026

January 2026

Title / URL	Issues
University of Michiganumich.edu/search/	1
Privacy Statement › University of Michiganumich.edu/about/privacy-statement/	1
Academics › University of Michiganumich.edu/academics/	1
Research › University of Michiganumich.edu/research/	1
Health & Medicine › University of Michiganumich.edu/health-medicine/	1
Initiatives › University of Michiganumich.edu/initiatives/	1
Schools & Colleges › University of Michiganumich.edu/schools-colleges/	1
Giving › University of Michiganumich.edu/giving/	1
Parents › University of Michiganumich.edu/parents/	1
404: Page Not Found › University of Michiganumich.edu/invented-url-for-404-page/	1

Fix missing ARIA label IDs

University of Michigan

Where this issue has occurred