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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.

Title / URL	Issues
Search the University of Stirling website and courses \| Search \| University of Stirlingwww.stir.ac.uk/search/	6
All news \| About \| University of Stirlingwww.stir.ac.uk/news/news-archive/	1
Find a course \| Find a course \| University of Stirlingwww.stir.ac.uk/courses/	1
Find a course \| Find a course \| University of Stirlingwww.stir.ac.uk/courses/?meta_level=	1

Fix missing ARIA label IDs

University of Stirling

Where this issue has occurred