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Chrome 110 applies User-Agent reduction to Navigator properties + User-Agent header #28275

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Chrome 110 applies User-Agent reduction to Navigator properties + User-Agent header #28275

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5b65fc0
Add User-Agent reduction data points to relevant features
chrisdavidmills Oct 23, 2025
2f6fcf2
Use more suitable spec_url
chrisdavidmills Oct 24, 2025
d611bfe
Update descriptions to class suggestion
chrisdavidmills Oct 29, 2025
e594f1c
Merge branch 'main' into ua-reduction
caugner Oct 31, 2025
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108 changes: 108 additions & 0 deletions api/Navigator.json
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Original file line number Diff line number Diff line change
Expand Up @@ -324,6 +324,42 @@
"standard_track": true,
"deprecated": false
}
},
"User-Agent_reduction": {
"__compat": {
"description": "Provides limited information due to [User-agent](https://developer.mozilla.org/docs/Web/HTTP/Guides/User-agent_reduction) reduction.",
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@caugner caugner Oct 24, 2025

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Here's my suggestion, but before applying, I'd like to get a second opinion by @ddbeck, who might have a better idea.

Suggested change
"User-Agent_reduction": {
"__compat": {
"description": "Provides limited information due to [User-agent](https://developer.mozilla.org/docs/Web/HTTP/Guides/User-agent_reduction) reduction.",
"applies_UA_reduction": {
"__compat": {
"description": "Applies [User-agent reduction](https://developer.mozilla.org/docs/Web/HTTP/Guides/User-agent_reduction)",

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@chrisdavidmills chrisdavidmills Oct 27, 2025

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FWIW, this sounds good to me.

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@chrisdavidmills chrisdavidmills Oct 29, 2025

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The corresponding docs have just been merged, so I'd like to expedite adding this data.

I like your suggestion, so for now I'm going to make this update in the places it appears. If we want to improve it further, I am happy to do so in a follow-up PR.

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@ddbeck ddbeck Nov 3, 2025

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This text is fine, but see my other comment on the whole structure of this feature: #28275 (comment)

"spec_url": "https://compat.spec.whatwg.org/#ua-string-section",
"support": {
"chrome": {
"version_added": "110"
},
"chrome_android": {
"version_added": "113"
},
"edge": "mirror",
"firefox": {
"version_added": false
},
"firefox_android": "mirror",
"oculus": "mirror",
"opera": "mirror",
"opera_android": "mirror",
"safari": {
"version_added": false
},
"safari_ios": "mirror",
"samsunginternet_android": "mirror",
"webview_android": {
"version_added": false
},
"webview_ios": "mirror"
},
"status": {
"experimental": true,
"standard_track": true,
"deprecated": false
}
}
}
},
"audioSession": {
Expand Down Expand Up @@ -2970,6 +3006,42 @@
"standard_track": true,
"deprecated": false
}
},
"User-Agent_reduction": {
"__compat": {
"description": "Provides limited/generic information due to [User-agent](https://developer.mozilla.org/docs/Web/HTTP/Guides/User-agent_reduction) reduction.",
"spec_url": "https://compat.spec.whatwg.org/#ua-string-section",
"support": {
"chrome": {
"version_added": "110"
},
"chrome_android": {
"version_added": "113"
},
"edge": "mirror",
"firefox": {
"version_added": false
},
"firefox_android": "mirror",
"oculus": "mirror",
"opera": "mirror",
"opera_android": "mirror",
"safari": {
"version_added": false
},
"safari_ios": "mirror",
"samsunginternet_android": "mirror",
"webview_android": {
"version_added": false
},
"webview_ios": "mirror"
},
"status": {
"experimental": true,
"standard_track": true,
"deprecated": false
}
}
}
},
"plugins": {
Expand Down Expand Up @@ -5487,6 +5559,42 @@
"standard_track": true,
"deprecated": false
}
},
"User-Agent_reduction": {
"__compat": {
"description": "Provides limited information due to [User-agent](https://developer.mozilla.org/docs/Web/HTTP/Guides/User-agent_reduction) reduction.",
"spec_url": "https://compat.spec.whatwg.org/#ua-string-section",
"support": {
"chrome": {
"version_added": "110"
},
"chrome_android": {
"version_added": "113"
},
"edge": "mirror",
"firefox": {
"version_added": false
},
"firefox_android": "mirror",
"oculus": "mirror",
"opera": "mirror",
"opera_android": "mirror",
"safari": {
"version_added": false
},
"safari_ios": "mirror",
"samsunginternet_android": "mirror",
"webview_android": {
"version_added": false
},
"webview_ios": "mirror"
},
"status": {
"experimental": true,
"standard_track": true,
"deprecated": false
}
}
}
},
"userAgentData": {
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36 changes: 36 additions & 0 deletions http/headers/User-Agent.json
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Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -39,6 +39,42 @@
"standard_track": true,
"deprecated": false
}
},
"User-Agent_reduction": {
"__compat": {
"description": "Provides limited information due to [User-agent](https://developer.mozilla.org/docs/Web/HTTP/Guides/User-agent_reduction) reduction.",
"spec_url": "https://compat.spec.whatwg.org/#ua-string-section",
"support": {
"chrome": {
"version_added": "110"
},
"chrome_android": {
"version_added": "113"
},
"edge": "mirror",
"firefox": {
"version_added": false
},
"firefox_android": "mirror",
"oculus": "mirror",
"opera": "mirror",
"opera_android": "mirror",
"safari": {
"version_added": false
},
"safari_ios": "mirror",
"samsunginternet_android": "mirror",
"webview_android": {
"version_added": false
},
"webview_ios": "mirror"
},
"status": {
"experimental": true,
"standard_track": true,
"deprecated": false
}
}
}
}
}
Expand Down