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SharedArrayBuffer

SharedArrayBuffer is an object that holds a fixed-length binary buffer. You can pass around comparably longer data with SharedArrayBuffer between agents (i.e., main thread and worker.) A change in one ShardArrayBuffer will reflect on the other side.

const sab = new SharedArrayBuffer(1024)worker.postMessage(sab)

The Spectre vulnerability seized ShardArrayBuffer in 2018, and since 2020, ShardArrayBuffer requires a Secure Context to run.

For the host document, I need two headers to enable ShardArrayBuffer.