The Sec-CH-UA-WoW64 Client Hint is a backwards compatible shim for sites relying on "WoW64-ness" (32-bit app running in 64-bit Windows) as they transition from the User-Agent string to UA-CH. It returns a boolean value.
We would like to provide a seamless transition from User-Agent-based use cases to UA-CH. The "WoW64" bit is the last missing piece to accomplish this goal.
Initial public proposal
wow, wow64, ua-ch, uach
https://github.com/w3ctag/design-reviews/issues/640 - still open, but issues have been addressed. I'll ping the existing issue with this addition so folks are aware, but I don't expect it to change TAG's stance of UA-CH as a feature.
TAG review status
We don’t anticipate any risk here, we’re just moving this bit from one API to another as a shim.
Interoperability and Compatibility
Interop: Not all browsers expose wow64-ness in the UA string today, so sites should not treat a false value as meaningful (the spec allows for always returning false).
Compat: This hint can be thought of as a compatibility shim for sites migrating from User-Agent to UA-CH, otherwise N/A.
Gecko: Non-harmful on UA-CH, but were they to implement UA-CH I would not expect them to add this hint (as they don’t expose this bit in their UA string anymore).
WebKit: No signal. I would also not expect Apple to implement this one, were they to implmement UA-CH.
Web developers: Mixed signals (https://github.com/WICG/ua-client-hints/issues/217) We know of at least one site (Meet) that uses wow64 to prevent sending a 7MB wasm binary to users were performance is known to be lousy .
Nothing special needed.
Is this feature fully tested by web-platform-tests?
We'll add some.
Requires code in //chrome?
Link to entry on the Chrome Platform Status
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