Browser information
Inspect browser-provided environment information and capability status. Privacy controls, permissions and implementations limit visibility; unavailable fields are not filled with invented defaults.
Using and interpreting this tool
Confirm the target and measurement point, then start the checks you need. Results retain sources, observation times and missing-data reasons. Traffic-intensive checks require a separate start.
After changing one setting, start a fresh run and compare A/B snapshots in history. Unknown, unconfigured and inapplicable do not mean passed.
Related tools and guides
Live measurements run in your browser after JavaScript loads. This introduction contains no visitor detection results.