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<h1>Here a tracker!</h1>
<script>
if (window.opener) {
SpecialPowers.wrap(document).userInteractionForTesting();
localStorage.foo = "opener" + Math.random();
// Don't call window.close immediatelly. It can happen that adding the
// "storage" event listener below takes more time than usual (it may need to
// synchronously subscribe in the parent process to receive storage
// notifications). Spending more time in the initial script can prevent
// the "load" event from being fired for the window opened by "open and test".
setTimeout(() => {
window.close();
}, 0);
}
if (parent) {
window.onmessage = e => {
if (e.data == "test") {
let status;
try {
localStorage.foo = "value" + Math.random();
status = true;
} catch (e) {
status = false;
}
parent.postMessage({type: "test", status }, "*");
return;
}
if (e.data == "open") {
window.open("localStorage.html");
return;
}
if (e.data == "open and test") {
let w = window.open("localStorage.html");
w.addEventListener("load", _ => {
let status;
try {
localStorage.foo = "value" + Math.random();
status = true;
} catch (e) {
status = false;
}
parent.postMessage({type: "test", status }, "*");
}, {once: true});
}
};
window.addEventListener("storage", () => {
let fromOpener = localStorage.foo.startsWith("opener");
let status;
try {
localStorage.foo = "value" + Math.random();
status = true;
} catch (e) {
status = false;
}
parent.postMessage({type: "test", status: status && fromOpener }, "*");
});
}
</script>