Press Tab on a website and a link receives focus. Press it again and the indicator disappears. You know something is selected, but you cannot tell what will happen if you press Enter.
For a keyboard user, visible focus is a map through the interface. Removing it for a cleaner appearance can leave navigation dependent on guesswork.
Follow a real task
Choose a common action such as finding a service and opening its enquiry form. Put the mouse aside and use the keyboard controls appropriate to the browser and interface. Watch whether the focus indicator remains visible on links, buttons, fields and menus.
W3C’s explanation of Focus Visible describes the purpose of this accessibility requirement. A quick keyboard review is useful, but it is not a complete accessibility audit or a guarantee of conformance.
Check order as well as appearance
The next focused item should make sense in the task. If focus jumps unexpectedly between unrelated parts of the page, inspect the structure and implementation. Styling that looks correct with a pointer may conceal a confusing keyboard sequence.
Open and close menus or dialogs. Confirm that focus moves appropriately, that controls can be operated and that the user can leave the component. A visible indicator inside a trap is still a broken experience.
Test against the actual background
A subtle outline may disappear over a photograph, coloured button or dark header. Check the indicator in the states and themes the site actually provides. Do not rely on a single screenshot of an empty form.
For a practical defect note, record the page, control, key sequence and expected behaviour. “Tab from the search field; focus becomes invisible on the submit button” gives a developer a reproducible starting point.
Fix the component, then repeat the task
Prefer appropriate native controls and avoid removing browser focus styling without a suitable replacement. Review custom components against relevant accessibility patterns. After a change, repeat the complete task rather than checking only that one border now appears.
Include people who use different access methods in broader testing where possible. Keyboard navigation is one important route, not the whole range of user needs.
A focus indicator is a small visual detail with a large practical role. When it is clear and moves predictably, the website tells people where they are and what they can do next.