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async function loadIframeAndReturnContentWindow() {
// Create and attach an iframe.
const iframe = document.createElement('iframe');
const iframeLoadPromise = new Promise((resolve, reject) => {
iframe.onload = resolve;
iframe.onerror = reject;
});
document.body.append(iframe);
await iframeLoadPromise;
return iframe.contentWindow;
}
promise_test(async t => {
const contentWin = await loadIframeAndReturnContentWindow();
window.results = [];
contentWin.eval(`
const parentResults = parent.results;
const source = new Observable(subscriber => {
// Detach the document before calling next().
window.frameElement.remove();
// This invokes the map() operator's internal observer's next steps,
// which at least in Chromium, must have a special "context is detached"
// check to early-return, so as to not crash before invoking the "mapper"
// callback supplied to the map() operator.
subscriber.next(1);
});
source.map(value => {
parentResults.push(value);
}).subscribe(v => parentResults.push(v));
`);
// If we got here, we didn't crash! Let's also check that `results` is empty.
assert_array_equals(results, []);
}, "map()'s internal observer's next steps do not crash in a detached document");
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