Why this tool is useful
Use CSS Focus Visible Checker when you need to compare focus and focus-visible selectors and flag rules that suppress keyboard focus outlines. The result is immediate and easy to verify before you reuse it.
Design & CSS ยท runs locally
CSS Focus Visible Checker
compare focus and focus-visible selectors and flag rules that suppress keyboard focus outlines.
Ready. Your working data stays in this browser.
How it works
Enter the values requested by CSS Focus Visible Checker. The browser validates the input, performs the calculation locally and produces a copyable result with clear errors.
Practical example
A practical use is to run CSS Focus Visible Checker on a small sample first, confirm the output, and then process the complete value or list.
Validation
The calculation is deterministic and explains validation errors instead of silently changing invalid input.
Privacy boundary
Input and output remain in this tab. Copy and download happen through browser APIs without a server upload.
Result passport
Every run reports its tool mode, timestamp and input/output size so transformed data can be audited.