Hidden content
Hiding content is very useful for accessibility. We can hide things visually and only display it to screen reader users, we can hide content from screen reader users and only show it visually, or we can hide content from both.
Techniques
Technique | Visually hidden | Screen reader hidden | Additional info |
---|---|---|---|
CSS:
|
Yes | No | There are multiple ways to accomplish this with CSS. This is the current way we are recommending it. |
CSS:
|
Yes | Yes | |
HTML5 attribute: hidden |
Yes | Yes | In supported browsers, this is the same as
|
aria attribute: aria-hidden='false' |
No | No | This is overwritten by other techniques. i.e. Using
will cause the element not to be read or seen. |
aria attribute: aria-hidden='true' |
No | Yes |
Aria hidden
aria-hidden should be used in combination with these techniques. If we want to hide something from just the screen reader, you can mark it as aria-hidden='true'
.
Items with aria-hidden='true'
are always ignored by the screen reader.
This is useful for:
- Collapsing Menus
- Repetitive information
- Off screen content
If an element has multiple states, its visibility should be tracked with aria-hidden
true/false
. An element with aria-hidden='false'
is treated by the screen reader as if it didn't have the aria-hidden
attribute and is read or not read based on other factors, such as CSS.
CSS
CSS can be used to hide content and allow it to still be used with the screen reader. For an example of that, see this code here,
.sr-only {
border: 0;
clip: rect(0 0 0 0);
height: 1px;
margin: -1px;
overflow: hidden;
padding: 0;
position: absolute;
width: 1px;
}
Using this we can:
- Provide additional details about a form element
- Hidden labels
- Error details
- Provide context to page elements
- Add additional instructions for navigation
We can also use CSS to hide content visually and from screen readers.
{
display: none;
}
This will hide completely and is the same as <div aria-hidden='true' hidden>content</div>
Note that aria-hidden='true'
should be used for additional compatibility.
display: none;
and hidden
can be used for:
- Collapsing menus
- Repetitive information
- Off-screen content
Additional resources
For more information on this topic, see these articles.