3.1.1 Language of a Page (Level A)
Set the default language for each page of your website in the code.
2.4.7 Visible Focus (Level A)
When an interactive element (link, button, form field, selectable element, etc.) receives focus, a visual indicator should show so the user can see what element they’re currently on.
2.4.3 Focus Order (Level A)
When users tab through your website the interactive elements should receive focus in a logical order.
2.4.1 Bypass Blocks (Level A)
Provide the ability to skip past your header (with menu, navigation, ads, etc.) and go directly to the main content of your website.
2.3.1 Three Flashes or Below Threshold (Level A)
Nothing on a webpage should flash more than three times in a second.