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<!DOCTYPE html> <meta charset="utf-8"> <script src="/resources/testharness.js"></script> <script src="/resources/testharnessreport.js"></script> <script src="resources/helpers.js"></script> <script> 'use strict'; promise_test(t => { const orig = createOriginalReadableStream(); const promise = testMessageEvent(window); postMessage(orig, '*', [orig]); assert_true(orig.locked, 'the original stream should be locked'); return promise; }, 'window.postMessage should be able to transfer a ReadableStream'); promise_test(t => { const orig = createOriginalReadableStream(); const promise = new Promise(resolve => { window.addEventListener('message', msg => { const port = msg.data; resolve(testMessageEvent(port)); port.start(); }, {once: true}); }); const mc = new MessageChannel(); postMessage(mc.port1, '*', [mc.port1]); mc.port2.postMessage(orig, [orig]); mc.port2.close(); assert_true(orig.locked, 'the original stream should be locked'); return promise; }, 'port.postMessage should be able to transfer a ReadableStream'); promise_test(t => { const orig = createOriginalReadableStream(); const promise = new Promise(resolve => { addEventListener('message', t.step_func(evt => { const [rs1, rs2] = evt.data; assert_equals(rs1, rs2, 'both ReadableStreams should be the same object'); resolve(); }), {once: true}); }); postMessage([orig, orig], '*', [orig]); return promise; }, 'the same ReadableStream posted multiple times should arrive together'); const onloadPromise = new Promise(resolve => onload = resolve); promise_test(() => { const orig = createOriginalReadableStream(); const promise = testMessageEvent(window); return onloadPromise.then(() => { const echoIframe = document.querySelector('#echo'); echoIframe.contentWindow.postMessage(orig, '*', [orig]); return promise; }); }, 'transfer to and from an iframe should work'); </script> <iframe id=echo src="resources/echo-iframe.html" style="display:none"></iframe>