9.15 WCAG 2.2 Success Criterion 2.4.11 － Focus Not Obscured (Minimum)

When an item receives focus, ensure that it is always partially visible. Users who rely on a keyboard interface to operate the page will be able to locate where they are on the webpage.

Before Rectification

The sticky header overlaps the whole focused item at the top left-hand corner.

After Rectification

The sticky header partially overlaps the focused item at the top left-hand corner, so that user can locate the focused item.

WCAG 2.2 Reference:

https://www.w3.org/WAI/WCAG22/Understanding/focus-not-obscured-minimum.html