Looks like we don't support sendBeacon in workers. Per https://w3c.github.io/beacon/#sec-sendBeacon-method we should.
I'm not familiar with sendBeacon implementation, but maybe sicking or ehsan could mentor this one? It was told that Edge keeps network alive in workers a bit longer than the rest of the worker to give sendBeacon better chance to succeed.
Priority: -- → P3
Whiteboard: [tw-dom] btpp-backlog → [tw-dom]
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