Links are user interface elements that navigate you to a new place or new content. Contrast this with buttons, which are designed to activate a feature.
Links can do things like help with page context, reference similar items of interest, and allow for endless connected information surfing through sites like Wikipedia. Links play a key part in your experience on the web, but without proper consideration they can be frustrating to use, skipped over, or completely unnoticed.
For screen reader assistive technology, links and buttons are expected to function differently from each other. If a link is activated and does not do what was expected, that can be disorienting and frustrating.
A common way a screen reader might navigate the page is by going through a list of all the links on the page. Without context, "read more" or "click here" links are not helpful.
People who have low or colorblind vision may have trouble identifying links that just use color to distinguish them from plain text, this is why keeping the underline styling on links within body text is important for identification.
A link's function is to navigate to a different page or new content. If instead a feature on the page is activated, use a
<button>. Learn when to use a link or button.
A link's purpose must be obvious from the link text alone. If you can't get an idea of where a link will take you based on the link text without reading the sourrounding text, the link text should be updated. Learn how to write good link text.
This is important because screen readers allow users to browse through a list of links, where the link text is the only clue of where a link will take you.
Like normal text, a link must have a
4.5:1 contrast against the background color that it is placed on. Use a contrast checker to validate that your link meets this required contrast.
If a link is sourrounded by text, it must be underlined or pass a
3:1 contrast against the sourrounding text as well. Alternativly an icon, a background shape or an outline can demarcate a link.
Some examples of this are:
accent.fgcolor in combination with
fg.defaultfor the sourrounding text on any of the
3:1contrast against the sourrounding text color AND a
4.5:1against the background color
Be descriptive with your links so that they can stand alone and be understood.
Don't use generic terms like 'click here' that can't be understood out of context.
Underline links in paragraphs and sentences
Don't use underlines for non-link highlights or forget to demarcate links
Use a link color that has a 3:1 contrast against the text color
Don't use a color that has less than a 3:1 contrast against the text color for links
Use an icon or a background shape to demarcate a link
Don't use text styles like italic or bold to demarcate links
Link text should be descriptive enough to convey the destination without relying on the surrounding text. Screen reader users often tab through links on a page to quickly find content without needing to listen to the full page. When link text is too generic like "Read more", the destination of the link is not conveyed.
It may be acceptable in some scenarios to provide a more descriptive link text for screen reader users by setting the
aria-label. However, this technique will result in divergence between the label and the text and is not an ideal, future-proof solution.
Whenever possible, prefer a single descriptive link text that is available for both sighted users and screen reader users.
If you must resort to the ARIA technique to provide a descriptive link text, follow these principles:
Accessible name fully includes the visible link text, "Learn more" and is well-formed with either label.
There are various plans available.<a href="..." aria-label="Learn more about GitHub pricing plans">Learn more</a>
Accessible name results in poorly-formed sentence, "Learn more about keyboard shortcuts allow you to access common commands more quickly".
<a href="..." aria-label="Learn more about keyboard shortcuts">Keyboard shortcuts</a> allow you to access common commands more quickly.
As demonstrated in the examples, this technique adds more complexity to the code and can introduce more problems than it solves so only use this technique if absolutely necessary.