Page not found (404 Error)- Canadian Museum of Nature

Collections - Canadian Museum of Nature

Donations - Canadian Museum of Nature

Our Science - Canadian Museum of Nature

Governance - Canadian Museum of Nature

For Educators - Canadian Museum of Nature

Canadian Museum of Nature

Visit Us - Canadian Museum of Nature

Hours - Canadian Museum of Nature

Volunteer - Canadian Museum of Nature

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

August 2025

July 2025

Title / URL	Issues
Page not found (404 Error)- Canadian Museum of Naturenature.ca/invented-url-for-404-page	14
Collections - Canadian Museum of Naturenature.ca/en/our-science/collections/	14
Donations - Canadian Museum of Naturenature.ca/en/join-give/donations/	13
Our Science - Canadian Museum of Naturenature.ca/en/our-science/	10
Governance - Canadian Museum of Naturenature.ca/en/about-the-museum/governance/	10
For Educators - Canadian Museum of Naturenature.ca/en/learn-explore/educators/	10
Canadian Museum of Naturenature.ca/en/	10
Visit Us - Canadian Museum of Naturenature.ca/en/visit-us/	10
Hours - Canadian Museum of Naturenature.ca/en/visit-us/plan-your-visit/hours/	10
Volunteer - Canadian Museum of Naturenature.ca/en/join-give/volunteering/	10

Fix duplicate IDs

Canadian Museum of Nature

Where this issue has occurred