doc-xhr-run-to-completion.html

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 <!-- This Source Code Form is subject to the terms of the Mozilla Public

    - License, v. 2.0. If a copy of the MPL was not distributed with this

    - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->

<!DOCTYPE html>

<meta charset=UTF-8>

<script>

const cpmm = SpecialPowers.Services.cpmm;

var result;

function newXHR() {

    var xhr = new XMLHttpRequest();

    xhr.open('GET', 'doc-xhr-run-to-completion.html', true);

    xhr.onload = done;

    xhr.onerror = done;

    xhr.onreadystatechange = done;

    xhr.ontimeout = done;

    xhr.send();

function singleRequest() {

    result = "test failed";

    newXHR();

    debugger;

    result = "test passed";

function multipleRequests() {

    result = "test failed";

    newXHR();

    newXHR();

    debugger;

    newXHR();

    debugger;

    debugger;

    result = "test passed";

function done() {

    cpmm.sendAsyncMessage(result);

</script>