Anchors must only be used as links with valid URLs or URL fragments
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Anchor links must be used with valid URLs or URL fragments so that they are discernible by a screen reader.
The Algorithm, in Simple Terms
Ensures that every anchor link is used as a link with a valid URL or URL fragment
Why this is Important
Inaccessible link elements pose great barriers to accessibility, as they are a fundamental component of a website.
Users who rely exclusively on a keyboard (and no mouse) to navigate a webpage can only click on links that can receive programmatic focus. If a link cannot receive programmatic focus, it will be inaccessible to these users.
How to Fix the Problem
Provide a valid link destination in the
href="#". The "#" symbol is used as a "fragment identifier separator", which means its intended purpose within the
href attribute is to precede a string of text which identifies a fragment within the page (a named anchor or an ID on the page). The use of "#" as the hypertext reference essentially means that the anchor points to nothing. In some browsers this may "point" to the entire document or to the top of the page, and this will cause an unexpected shift in focus.
- HTML 4