Academic Success

Student Support

Student Organizations

Visiting & Tours

Admissions & Aid

University of California San Diego

Teaching and Research

About UC San Diego

Performing Arts at UC San Diego

Visual Arts at UC San Diego

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

October 2025

September 2025

	Title / URL	Issues
	Academic Successucsd.edu/academics/academic-success.html	14
	Student Supportucsd.edu/student-life/student-support.html	12
	Student Organizationsucsd.edu/student-life/organizations/index.html	6
	Visiting & Toursucsd.edu/about/visiting-tours/index.html	4
	Admissions & Aiducsd.edu/admissions-aid/	2
	University of California San Diegoucsd.edu/index.html	2
	Teaching and Researchucsd.edu/arts/teaching-and-research/index.html	2
	About UC San Diegoucsd.edu/about/index.html	2
	Performing Arts at UC San Diegoucsd.edu/arts/performing-arts/index.html	2
	Visual Arts at UC San Diegoucsd.edu/arts/visual-arts/index.html	2

Fix duplicate IDs

University of California San Diego

Where this issue has occurred