Thunderbird — Free Your Inbox. — Thunderbird

ARIA hidden element must not be focusable or contain focusable elements

Ensure aria-hidden elements are not focusable nor contain focusable elements

Links must have discernible text

Ensure links have discernible text

Heading levels should only increase by one

Ensure the order of headings is semantically correct

Heading levels should only increase by one

Ensure the order of headings is semantically correct

Heading levels should only increase by one

Ensure the order of headings is semantically correct

Heading levels should only increase by one

Ensure the order of headings is semantically correct

Heading levels should only increase by one

Ensure the order of headings is semantically correct

Heading levels should only increase by one

Ensure the order of headings is semantically correct

Aside should not be contained in another landmark

Ensure the complementary landmark or aside is at top level

Aside should not be contained in another landmark

Ensure the complementary landmark or aside is at top level

Landmarks should have a unique role or role/label/title (i.e. accessible name) combination

Ensure landmarks are unique

All page content should be contained by landmarks

Ensure all page content is contained by landmarks