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conformance · v145
v145 · reduced-user-agent-strings-by-default — conformance probe
6 assertions drawn from the spec. Each is a single contract the spec text makes. Pass/fail reflects what this browser executed; blocked means the contract was not run because it needs user mediation, hardware, or another unavailable precondition. Open the page in Chrome stable / canary / Firefox / Safari to compare.
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pass
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fail
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| id | contract | kind | verdict | detail |
|---|---|---|---|---|
user-agent-string-exists |
navigator.userAgent is a string — the legacy surface that is now reduced by default. | typeof | … | |
user-agent-data-exists |
navigator.userAgentData is the recommended UA-CH surface that replaces high-entropy User-Agent inspection. | exists | … | |
user-agent-data-brands |
navigator.userAgentData.brands is an array — low-entropy hint exposed without prompting. spec ↗ | script | … | |
user-agent-data-mobile |
navigator.userAgentData.mobile is a boolean — coarse mobile/desktop hint. spec ↗ | script | … | |
user-agent-data-platform |
navigator.userAgentData.platform is a string — low-entropy OS family hint. spec ↗ | script | … | |
user-agent-high-entropy-values-is-function |
navigator.userAgentData.getHighEntropyValues is a function — the explicit opt-in path for richer UA info. spec ↗ | script | … |