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wpt / dom / observable / tentative / observable-from.any.worker.html

Spec: DOM ↗

Runs: Chrome 155.0.8041.0 (wpt@4a01b83e3, 2026-09-04) | Firefox 157.0a1 (wpt@e7122b73f, 2026-09-04) | Safari 251 preview (wpt@2c385f65e, 2026-09-04) | Ladybird 1.0-70fb3 (wpt@4a01b83e3, 2026-09-04) | Servo Servo 0.6 (wpt@7e3d005d7, 2026-09-03) | Blitz a50cb8971 (wpt@a95401e4e, 2026-09-03)

View on the Blitz WPT dashboard | Open test on wpt.live | wpt.fyi

ChromeFirefoxSafariLadybirdServoBlitz
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SubtestChromeFirefoxSafariLadybirdServoBlitz
from(): Observable.from() is a functionPASSFAILFAILFAILFAIL—
from(): Failed conversionsPASSFAILFAILFAILFAIL—
from(): Given an observable, it returns that exact observablePASSFAILFAILFAILFAIL—
from(): Given an arrayPASSFAILFAILFAILFAIL—
from(): Iterable converts to ObservablePASSFAILFAILFAILFAIL—
from(): [Symbol.iterator] side-effects (one observable)PASSFAILFAILFAILFAIL—
from(): [Symbol.iterator] not callablePASSFAILFAILFAILFAIL—
from(): [Symbol.iterator] not callable AFTER SUBSCRIBE throwsPASSFAILFAILFAILFAIL—
from(): [Symbol.iterator] returns null AFTER SUBSCRIBE throwsPASSFAILFAILFAILFAIL—
from(): [Symbol.iterator] is not cachedPASSFAILFAILFAILFAIL—
from(): [Symbol.iterator] side-effects (many observables)PASSFAILFAILFAILFAIL—
from(): [Symbol.iterator] next() throws errorPASSFAILFAILFAILFAIL—
from(): Converts Promise to ObservablePASSFAILFAILFAILFAIL—
from(): Converts rejected Promise to Observable. No `unhandledrejection` event when error is handled by subscriptionPASSFAILFAILFAILFAIL—
from(): Rejections not handled by subscription are reported to the global, and still not sent as an unhandledrejection eventPASSFAILFAILFAILFAIL—
from(): Observable that implements @@iterator protocol gets converted as an Observable, not iteratorPASSFAILFAILFAILFAIL—
from(): Promise that implements @@iterator protocol gets converted as an iterable, not PromisePASSFAILFAILFAILFAIL—
from(): Promise whose [Symbol.iterator] returns null converts as PromisePASSFAILFAILFAILFAIL—
from(): Rethrows the error when Converting an object whose @@iterator method *getter* throws an errorPASSFAILFAILFAILFAIL—
from(): Async iterable protocol null, converts as iteratorPASSFAILFAILFAILFAIL—
from(): Asynchronous iterable conversionPASSFAILFAILFAILFAIL—
from(): Asynchronous iterable multiple in-flight subscriptionsPASSFAILFAILFAILFAIL—
from(): Sync iterable multiple in-flight subscriptionsPASSFAILFAILFAILFAIL—
from(): Asynchronous generator conversion: can only be used oncePASSFAILFAILFAILFAIL—
from(): Promise-wrapping semantics of IteratorResult interfacePASSFAILFAILFAILFAIL—
from(): Errors thrown in Symbol.asyncIterator() are propagated synchronouslyPASSFAILFAILFAILFAIL—
from(): Errors thrown in async iterator's next() GETTER are propagated in a microtaskFAILFAILFAILFAILFAIL—
from(): Errors thrown in async iterator's next() are propagated in a microtaskPASSFAILFAILFAILFAIL—
from(): Aborting sync iterable midway through iteration both stops iteration and invokes `IteratorRecord#return()PASSFAILFAILFAILFAIL—
from(): Aborting async iterable midway through iteration both stops iteration and invokes `IteratorRecord#return()PASSFAILFAILFAILFAIL—
from(): Sync iterable: `Iterator#return()` must return an Object, or an error is thrownPASSFAILFAILFAILFAIL—
from(): Async iterable: `Iterator#return()` must return an Object, or a Promise rejects asynchronouslyPASSFAILFAILFAILFAIL—
from(): Asynchronous iterable conversion, with synchronous iterable fallbackFAILFAILFAILFAILFAIL—
from(): Generator finally block runs when subscription is abortedPASSFAILFAILFAILFAIL—
from(): Generator finally block run when Observable completesPASSFAILFAILFAILFAIL—
from(): Generator finally block run when Observable errorsPASSFAILFAILFAILFAIL—
from(): Async generator finally block run when subscription is abortedPASSFAILFAILFAILFAIL—
from(): Async generator finally block runs when Observable completesPASSFAILFAILFAILFAIL—
from(): Async generator finally block run when Observable errorsPASSFAILFAILFAILFAIL—
from(): Sync iterable: error thrown from IteratorRecord#return() can be synchronously caughtPASSFAILFAILFAILFAIL—
from(): Async iterable: error thrown from IteratorRecord#return() is wrapped in rejected PromisePASSFAILFAILFAILFAIL—
from(): Subscribing to an iterable Observable with an aborted signal does not call next()PASSFAILFAILFAILFAIL—
from(): When iterable conversion aborts the subscription, next() is never calledPASSFAILFAILFAILFAIL—
from(): Aborting an async iterable subscription stops subsequent next() calls, but old next() Promise reactions are web-observablePASSFAILFAILFAILFAIL—
from(): Abort after complete does NOT call IteratorRecord#return()PASSFAILFAILFAILFAIL—
Invalid async iterator protocol error is surfaced before Subscriber#signal is consultedPASSFAILFAILFAILFAIL—
Invalid iterator protocol error is surfaced before Subscriber#signal is consultedPASSFAILFAILFAILFAIL—
No error is reported when aborting a subscription to a sync iterator that has no `return()` implementationPASSFAILFAILFAILFAIL—