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Test Info: Warnings

  • This test gets skipped with pattern: OR os == 'win' OR os == 'linux' OR os == 'android'
<title>Test for Bug 907503</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<script src="/tests/SimpleTest/WindowSnapshot.js"></script>
<script type="application/javascript" src="imgutils.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
<a target="_blank" href="">Mozilla Bug 907503</a>
<p id="display"></p>
<div id="content">
<div id="referenceDiv" style="height: 100px; width: 100px;
display: none; background: lime"></div>
<pre id="test">
<script type="application/javascript">
/** Test for Bug 907503**/
SimpleTest.requestFlakyTimeout("Early failure timeout");
const FAILURE_TIMEOUT = 120000; // Fail early after 120 seconds (2 minutes)
const Cc = SpecialPowers.Cc;
const Ci = SpecialPowers.Ci;
const gImg = document.getElementsByTagName("img")[0];
var gMyDecoderObserver; // value will be set in main()
var gReferenceSnapshot; // value will be set in takeReferenceSnapshot()
var gOnFrameUpdateCounter = 0;
var gIsTestFinished = false;
function takeReferenceSnapshot() {
// Take a snapshot of the initial (essentially blank) page
let blankSnapshot = snapshotWindow(window, false);
// Show reference div, & take a snapshot
let referenceDiv = document.getElementById("referenceDiv"); = "block";
gReferenceSnapshot = snapshotWindow(window, false);
ok(compareSnapshots(blankSnapshot, gReferenceSnapshot, false)[0],
"reference snapshot shouldn't match blank page snapshot");
// Re-hide reference div, and take another snapshot to be sure it's gone = "none";
let blankSnapshot2 = snapshotWindow(window, false);
ok(compareSnapshots(blankSnapshot, blankSnapshot2, true)[0],
"reference div should disappear when it becomes display:none");
function myOnFrameUpdate(aRequest) {
if (gIsTestFinished) {
ok(true, "myOnFrameUpdate called");
let currentSnapshot = snapshotWindow(window, false);
if (compareSnapshots(currentSnapshot, gReferenceSnapshot, true)[0]) {
ok(true, "Animated image looks correct, " +
"at call #" + gOnFrameUpdateCounter + " to myOnFrameUpdate");
function failTest() {
if (gIsTestFinished) {
ok(false, "timing out after " + FAILURE_TIMEOUT + "ms. " +
"Animated image still doesn't look correct, " +
"after call #" + gOnFrameUpdateCounter + " to myOnFrameUpdate");
function cleanUpAndFinish() {
// On the off chance that failTest and myOnFrameUpdate are triggered
// back-to-back, use a flag to prevent multiple calls to SimpleTest.finish.
if (gIsTestFinished) {
let imgLoadingContent = SpecialPowers.wrap(gImg);
gIsTestFinished = true;
function main() {
// Create, customize & attach decoder observer
var observer = new ImageDecoderObserverStub();
observer.frameUpdate = myOnFrameUpdate;
gMyDecoderObserver =
let imgLoadingContent = SpecialPowers.wrap(gImg);
// We want to test the cold loading behavior, so clear cache in case an
// earlier test got our image in there already.
// kick off image-loading! myOnFrameUpdate handles the rest.
gImg.setAttribute("src", "lime-anim-100x100-2.svg");
// In case something goes wrong, fail earlier than mochitest timeout,
// and with more information.
setTimeout(failTest, FAILURE_TIMEOUT);
window.onload = main;