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<!DOCTYPE html>
<meta charset=utf-8>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<body>
<script>
const t = async_test('postMessage and block');
const w = new Worker('support/postMessage_block_worker.js');
w.onmessage = t.step_func_done(() => {
const a = new Int32Array(new SharedArrayBuffer(4));
w.postMessage(a);
while (Atomics.load(a, 0) === 0);
assert_equals(Atomics.load(a, 0), 1);
});
</script>
</body>
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