Saint Louis University | SLU.edu : SLU - Saint Louis University

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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
Saint Louis University \| SLU.edu : SLU - Saint Louis Universitywww.slu.edu/index.php	8
Saint Louis University \| SLU.edu : SLU - Saint Louis Universitywww.slu.edu/	8
Saint Louis University \| SLU.edu : SLU - Saint Louis Universitywww.slu.edu/index.php?404error	8
First time visit: View without clicking anythingwww.slu.edu/	8
Contact Saint Louis University : SLU - Saint Louis Universitywww.slu.edu/contact/index.php	1
Research at SLU : SLU - Saint Louis Universitywww.slu.edu/research/index.php	1

Fix missing ARIA label IDs

Saint Louis University

Where this issue has occurred