Why do some APIs fail only in private/incognito windows?

Many browsers restrict storage and device APIs in private mode to reduce tracking. Try a normal window if a feature is blocked in incognito.

Does a low HTML5 score mean my browser is insecure?

Not necessarily—it just means certain capabilities are unavailable. Security depends on patches and settings, not the raw feature count.

How often should I re-run the test?

After browser updates, driver updates, or policy changes. Re-running confirms whether changes took effect.

Browser Diagnostics

HTML5 Test

Feature detection via direct API probing

HTML5 Capability Test

Core browser APIs and storage features

ScoreHTML5 score

Overall compatibility0%

Why run the HTML5 test?

We probe canvas, audio, video, WebSockets, geolocation, storage APIs, and more so you can see which modern web features are truly available in this browser and device. This helps explain why some apps show 'your browser is out of date' even when the version looks current.

Missing scores usually indicate enterprise policy blocks, privacy-focused browsers with features disabled by default, or strict tracking protection modes. Review the failing items, then jump to a targeted guide to enable the feature.

FAQ

Why do some APIs fail only in private/incognito windows?: Many browsers restrict storage and device APIs in private mode to reduce tracking. Try a normal window if a feature is blocked in incognito.
Does a low HTML5 score mean my browser is insecure?: Not necessarily—it just means certain capabilities are unavailable. Security depends on patches and settings, not the raw feature count.
How often should I re-run the test?: After browser updates, driver updates, or policy changes. Re-running confirms whether changes took effect.

Why run the HTML5 test?

Popular fixes

FAQ