function ok(what, msg) { postMessage({ event: msg, test: 'ok', a: what }); } function is(a, b, msg) { postMessage({ event: msg, test: 'is', a: a, b: b }); } self.onmessage = function onmessage(event) { // An XHR with system privileges will be able to do cross-site calls. const TEST_URL = "http://example.com/tests/content/base/test/test_XHR_system.html"; is(location.hostname, "mochi.test", "hostname"); var xhr = new XMLHttpRequest({mozSystem: true}); is(xhr.mozSystem, true, ".mozSystem == true"); xhr.open("GET", TEST_URL); xhr.onload = function onload() { is(xhr.status, 200); ok(xhr.responseText != null); ok(xhr.responseText.length); postMessage({test: "finish"}); }; xhr.onerror = function onerror() { ok(false, "Got an error event!"); postMessage({test: "finish"}); } xhr.send(); };