Rocket Validator integrates axe-core version 4.1,
which currently checks 91 accessibility rules, into an automated web site scanner.
Accessibility rules tagged as WCAG: 2.4.1.
Each page must have a
main landmark to provide a mechanism to bypass repeated blocks of content or interface elements (like header and navigation) and quickly arrive at the main content.
Since web sites often display secondary, repeated content on multiple pages (such as navigation links, heading graphics, and advertising frames), keyboard-only users benefit from faster, more direct access to the primary content on a page. This reduces keystrokes and minimizes associated physical pain.
For users who cannot use a mouse, navigating with a keyboard is more difficult and time-consuming when the interface does not include methods to make keyboard navigation easier. For example, to activate a link in the middle of a web page, a keyboard user may have to tab through a large number of links and buttons in the header and main navigation of the page.
At the extreme end, users with severe motor limitations might require several minutes to tab through all of those elements, and can lead to fatigue and possible physical pain for some users. Even users with less severe constraints will require longer than mouse users, who can click on the desired link in a second or two.