#4039 - UA-client-hints specification, Sec-CH-UA (user agent string deprecation) (on hold)
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It looks like their progress has stalled and they've sailed way past their aggressive timeline.
Also, the major version of web browsers is apparently going to stay even when the UA header is stalled. "Note that the User-Agent significant version will continue to be updated.".
The mobile info will be included in what is frozen.
So it seems the urgency of all this is much less of an issue now.
We are now using the standard tangentially within #4962.
If we were to use it more, we would...
- Make browser detection addon use it
- Make our stats collection preferentially use it
- Use Sec-CH-UA-Mobile being "?1" in the is_mobile function