gecko/browser/base/content/test/browser_bug585785.js

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var tab;
function test() {
waitForExplicitFinish();
tab = gBrowser.addTab();
isnot(tab.getAttribute("fadein"), "true", "newly opened tab is yet to fade in");
// Try to remove the tab right before the opening animation's first frame
window.mozRequestAnimationFrame(checkAnimationState);
}
function checkAnimationState() {
if (tab.getAttribute("fadein") != "true") {
window.mozRequestAnimationFrame(checkAnimationState);
return;
}
info(window.getComputedStyle(tab).maxWidth);
gBrowser.removeTab(tab, { animate: true });
if (!tab.parentNode) {
ok(true, "tab removed synchronously since the opening animation hasn't moved yet");
finish();
return;
}
info("tab didn't close immediately, so the tab opening animation must have started moving");
info("waiting for the tab to close asynchronously");
tab.addEventListener("transitionend", function (event) {
if (event.propertyName == "max-width") {
tab.removeEventListener("transitionend", arguments.callee, false);
executeSoon(function () {
ok(!tab.parentNode, "tab removed asynchronously");
finish();
});
}
}, false);
}