Re: [whatwg/xhr] Abandon hope of removing sync XHR from the web platform? (#20)

I am looking for an alternative for sync XHR requests for our SCORM platform. The following code is an example as found in **thousands of existing and in use SCORM e-learning modules**.

This (simplified) code is called by the content, follows the SCORM API, and **can not be changed(!)**:

Example 1:
```
var initResult = api.Initialize();
if (initResult) {
 // start SCORM communication
} else {
 // something went wrong 
}
```

Example 2:
```
var maxCount = api.getValue('interaction.count');
api.setValue('interaction.' + maxCount + '.foo', 'bar');
```

Example 3:
```
var isPassed = api.getValue('passing_score');
if (isPassed > 0.8) {
 // do something...
}
```

I think you got it ... ;-D

The (SCORM-)api methods "Initialize", "getValue" and "setValue" are implemented by our LMS application and use sync XHR to **ensure data integrity**.

As mentioned, the calling code is part of **third party content** and **can not be changed** to use promises, workers or the like. 

I would be pleased about suggestions, because currently I see no alternative for sync XHR in this case of SCORM API communication.

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