Re: [w3c/screen-orientation] Editorial: rewrite parallel steps (PR #236)

@marcoscaceres commented on this pull request.



> +        being [=Document/fully active=] while [=in parallel=], and if the
+        |document|'s {{Document/[[orientationPendingPromise]]}} is not `null`,
+        [=reject and nullify the current lock promise=] of |document| with an
+        {{"AbortError"}}:

Thinking out loud...  this is the only case we can realistically capture:

```JS
const iframe = document.querySelector("iframe");
const p = iframe.contentWindows.screen.orientation.lock("landscape");
iframe.remove();
// p aborts
```

So, the check should happen as the very first thing after going "in parallel". 

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