Faculty of Arts and Science - Concordia University

Université Concordia

Concordia University

First time visit: View without clicking anything

Events - Concordia University

Working at Concordia - Concordia University

News - Concordia University

IT services - Concordia University

History - Concordia University

Page not found - Concordia University

All `id` attributes on a page must be unique, or accessible technologies used by the page 
can stop working.

## Example

The duplicate `id` here makes it unclear which label belongs to which input field:

```html
<label for="name">Your name</label>
<input id="name">

<label for="name">Company name</label>
<input id="name">
```

As a result, accessible technologies like screen readers can fail to read out the 
correct text, or may read out no text at all.

Similar issues can occur when using `aria-labelledby` and `aria-describedby`.

## How to fix

Ensure all `id` attributes on a page are unique. 

## More information

See [Technique H93](https://www.w3.org/TR/2016/NOTE-WCAG20-TECHS-20161007/H93) 
for more information.

duplicate-id

May 2025

April 2025

Title / URL	Issues
Faculty of Arts and Science - Concordia Universitywww.concordia.ca/artsci.html	10
Université Concordiawww.concordia.ca/fr.html	6
Concordia Universitywww.concordia.ca/	6
First time visit: View without clicking anythingwww.concordia.ca/	6
Events - Concordia Universitywww.concordia.ca/events.html	5
Working at Concordia - Concordia Universitywww.concordia.ca/hr/jobs.html	4
News - Concordia Universitywww.concordia.ca/news.html	4
IT services - Concordia Universitywww.concordia.ca/it.html	4
History - Concordia Universitywww.concordia.ca/about/history.html	2
Page not found - Concordia Universitywww.concordia.ca/invented-url-for-404-page.html	2

Fix duplicate IDs

Concordia University

Where this issue has occurred