Update explainer for cross-origin reportEvent() support #1134
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Documents that are cross-origin to the mapped URL of a FencedFrameConfig can send
reportEvent()
beacons, if the root fenced frame opts in with a newAllow-Cross-Origin-Event-Reporting
response header and the invoking document opts in by callingreportEvent()
with a newcrossOriginExposed
parameter set totrue
.