Web accessibility is an essential part of modern website development. Creating digital experiences that everyone can use, including people who rely on screen readers and other assistive technologies, requires careful attention to how content is presented and described. One important aspect of accessibility is ensuring that interactive elements have clear and meaningful labels.
This is where ARIA attributes come into play. ARIA, which stands for Accessible Rich Internet Applications, provides additional information that helps assistive technologies understand web content more effectively. Among the most commonly used ARIA attributes are aria-label and aria-labelledby.
Although these two attributes serve a similar purpose, they work differently and should be used in different situations. Understanding when to use each one can significantly improve the accessibility of your website while helping you avoid common implementation mistakes. According to guidance from Webmax, both attributes provide an accessible name for an element, but they achieve this in different ways.
What Is an Accessible Name?
Before exploring the differences between aria-label and aria-labelledby, it is important to understand the concept of an accessible name.
An accessible name is the text that assistive technologies, such as screen readers, use to identify and describe an element. When a user navigates to a button, link, form field, or dialog, the screen reader announces the accessible name so the user understands the element's purpose.
In many cases, HTML automatically provides accessible names through semantic elements. For example:
- Button text provides the button's accessible name.
- The alt attribute provides an image's accessible name.
- A <label> element provides a form field's accessible name.
However, there are situations where an accessible name is missing or insufficient. This is where ARIA attributes become useful.
Read more about aria roleshttps://webmax.co/blogs/what-are-the-aria-roles-and-attributes-guide
What is aria-label?
The aria-label attribute allows developers to define an accessible name directly within an element.
Instead of referencing text elsewhere on the page, aria-label provides a text string that assistive technologies can read. This makes it particularly useful when an element has no visible text label.
Example of aria-label
<button aria-label="Search">
<img src="search-icon.svg" alt="">
</button>
In this example, the button contains only an icon. A screen reader user would not know the button's purpose without additional information. The aria-label attribute supplies the accessible name "Search," allowing the screen reader to announce it correctly.
Common Uses of aria-label
The aria-label attribute is often used for:
- Icon-only buttons
- Search icons
- Close buttons
- Social media icons
- Custom interactive controls
- Elements without visible text labels
Because the label is written directly into the attribute, it provides a straightforward way to add accessibility information when no suitable visible text exists.
What is aria-labelledby?
The aria-labelledby attribute works differently
Instead of creating a new label, it references existing text elsewhere on the page. The referenced element's text becomes the accessible name of the target element.
Example of aria-labelledby
<div role="dialog"
id="dialog1"
aria-labelledby="dialog1_label"
aria-modal="true">
<h2 id="dialog1_label">
Add Delivery Address
</h2>
</div>
In this example, the dialog receives its accessible name from the heading element. When a screen reader encounters the dialog, it announces "Add Delivery Address" because the heading text is referenced by the aria-labelledby attribute.
Common Uses of aria-labelledby
The aria-labelledby attribute is commonly used for:
- Modal dialogs
- Form controls
- Sections and regions
- Complex widgets
- Landmarks
- Components with visible heading
It is generally preferred when visible text already exists on the page because it keeps visual and accessible labels synchronized.
Key Differences Between aria-label and aria-labelledby
Although both attributes provide accessible names, several important differences separate them.
- Source of the Label
The biggest difference is where the label comes from.
With aria-label, the accessible name is defined directly within the attribute.
<button aria-label="Search"></button>
With aria-labelledby, the accessible name comes from another element.
<h2 id="searchHeading">Search</h2>
<button aria-labelledby="searchHeading"></button>
The first creates a new label. The second reuses existing content.
- Visibility
The text inside aria-label is invisible to users who are not using assistive technology.
In contrast, the text referenced by aria-labelledby is typically visible on the page.
This makes aria-labelledby more transparent because both sighted users and screen reader users interact with the same content.
- Maintenance and Consistency
One advantage of aria-labelledby is that changes to the visible text automatically update the accessible name.
For example:
<h2 id="title">Account Settings</h2>
<div aria-labelledby="title"></div>
If the heading changes to "Profile Settings," the accessible name updates automatically.
With aria-label, developers must manually update the attribute whenever the label changes. Failure to do so can create inconsistencies between visible and accessible content.
- Translation Support
The A11Y Collective notes that aria-label does not automatically benefit from content translation in many implementations. This can create challenges for multilingual websites.
Since aria-labelledby references visible content, translated page content automatically updates the accessible name as well.
For websites that support multiple languages, aria-labelledby is often the more maintainable option.
- Multiple Labels
One unique feature of aria-labelledby is that it can reference multiple elements.
Example:
<span id="label1">Complete the</span>
<span id="label2">registration form</span>
<button aria-labelledby="label1 label2">
Submit
</button>
The screen reader combines the referenced text and announces:
"Complete the registration form."
This capability provides additional flexibility that aria-label does not offer.
Which Attribute Takes Priority?
When multiple naming methods are present, browsers follow an accessible name calculation process.
According to accessibility guidance, aria-labelledby has the highest priority among common naming techniques. If an element contains both aria-label and aria-labelledby, the value from aria-labelledby is used. It overrides:
- aria-label
- Element text
- Alt text
- Other naming methods
For example:
<button
aria-label="Search"
aria-labelledby="searchHeading">
</button>
The screen reader will use the text referenced by aria-labelledby, not the aria-label value.
When Should You Use aria-label?
Use aria-label when no suitable visible text exists that can be referenced.
Good examples include
Icon-Only Buttons
<button aria-label="Close">
×
</button>
Search Icons
<button aria-label="Search">
<svg></svg>
</button>
Custom Controls Without Text
<div role="button"
aria-label="Play Video">
</div
In these situations, there is no visible label available, making aria-label the most practical solution.
When Should You Use aria-labelledby?
Use aria-labelledby whenever visible text already exists and can serve as the accessible name.
Examples include:
Dialog Boxes
<div role="dialog"
aria-labelledby="dialog-title">
<h2 id="dialog-title">
Account Information
</h2>
</div
Form Inputs
<label id="nameLabel">
Name
</label>
<input
type="text"
aria-labelledby="nameLabel"
Sections and Regions
<h2 id="servicesHeading">
Our Services
</h2>
<section aria-labelledby="servicesHeading">
</section>
These implementations ensure that the visible and accessible experiences are aligned.
ARIA Accessibility Best Practices
While ARIA attributes are powerful, accessibility experts consistently emphasize that semantic HTML should be your first choice.
Use Native HTML First
Whenever possible:
- Use actual button text.
- Use proper <label> elements.
- Use descriptive link text.
- Add meaningful alt text to images.
Native HTML is generally more reliable than ARIA.
Avoid Unnecessary ARIA
Accessibility professionals often follow the principle:
"No ARIA is better than bad ARIA."
Incorrect ARIA implementation can create confusion rather than improving accessibility.
Verify Referenced IDs
When using aria-labelledby, always confirm that referenced IDs exist and remain unchanged.
Broken references can prevent screen readers from announcing the correct accessible name.
Keep Labels Accurate
Whether using aria-label or aria-labelledby, ensure the accessible name clearly describes the element's purpose.
Vague labels such as "Click Here" or "Button" provide little value to users.
Common Mistakes to Avoid
Developers frequently make a few avoidable mistakes when working with ARIA labels.
Using aria-label When Visible Text Exists
If visible text already appears on the page, referencing it with aria-labelledby is the better option.
Overwriting Useful Labels
Applying aria-label to elements that already have meaningful text can unintentionally replace the existing accessible name.
Forgetting Updates
When content changes, hardcoded aria-label values may become outdated and inconsistent with visible content.
Referencing Invalid IDs
An incorrect ID in aria-labelledby can break the relationship and leave users without a meaningful accessible name.
Final Thoughts from Webmax
Both aria-label and aria-labelledby play important roles in web accessibility. They help provide accessible names for elements when native HTML alone is not enough.
The key distinction is simple. aria-label creates a new label directly within an element, while aria-labelledby uses existing visible text from another element as the accessible name. In most cases, if visible text already exists, aria-labelledby is the preferred solution because it promotes consistency, simplifies maintenance, and works well with translated content. If no suitable visible text is available, aria-label becomes the appropriate choice.
Above all, remember that semantic HTML should always be your first option. ARIA should enhance accessibility when necessary, not replace well-structured HTML. By understanding the differences between aria-label and aria-labelledby, developers can create more inclusive digital experiences that serve all users effectively.