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