> Does this metric count sites that have opted into the rOT?  My company has 
> a web product hosted under dozens of domains that has the rOT registered 
> for each one of them.  I don't see those domains in the top 156 list 
> (admittedly a quick scan), so I wonder if it is only counting pages that 
> try to create SAB without any isolation _and_ without the rOT   ?


I believe, for privacy reason, websites are only shown after a sufficient 
feature usage threshold. This metrics do not count directly site that have 
opted into the rOT. See code location 
<https://source.chromium.org/chromium/chromium/src/+/main:third_party/blink/renderer/bindings/core/v8/use_counter_callback.cc;l=278?q=V8SharedArrayBufferConstructedWithoutIsolation%20-file:out%20&ss=chromium>.
 
It counts page using SharedArrayBuffer, without being crossOriginIsolated. 
Only website that have registered for the reverse OT can do this more or 
less. So, 0.036% is the amount of page that would break without the rOT. 
However, the rOT users are probably an order of magnitude larger.
 

> Credentialless has helped in some cases, but anonymous iframes is what 
> we're hoping for to resolve the rest of the flows, but that feature seems 
> to be a bit stuck and unmoving at the moment from what we can tell.
>

Happy to hear COEP:credentialless helped for simple third party ressources! 
For iframes, anonymous iframe <https://github.com/WICG/anonymous-iframe> is 
moving and will be ready soon. We aim for a M106 OT.

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