To wait for all with a list of Promise<T> values promises, with success steps successSteps that take a list of T values and failure steps failureSteps that take a rejection reason any value, perform the following steps:

1. Let fullfilledCount be 0.

2. Let rejected be false.

3. Let rejectionHandlerSteps be the following steps given arg:

   1. If rejected is true, abort these steps.

   2. Set rejected to true.

   3. Perform failureSteps given arg.

4. Let rejectionHandler be CreateBuiltinFunction(rejectionHandlerSteps, 1, "", « »):

5. Let total be promises’s size.

6. If total is 0, then:

   1. Queue a microtask to perform successSteps given « ».

   2. Return.

7. Let index be 0.

8. Let result be a list containing total null values.

9. For each promise of promises:

   1. Let promiseIndex be index.

   2. Let fulfillmentHandler be the following steps given arg:

      1. Set result[promiseIndex] to arg.

      2. Set fullfilledCount to fullfilledCount + 1.

      3. If fullfilledCount equals total, then perform successSteps given result.

   3. Let fulfillmentHandler be CreateBuiltinFunction(fulfillmentHandler, 1, "", « »):

   4. Perform PerformPromiseThen(promise, fulfillmentHandler, rejectionHandler).

   5. Set index to index + 1.