getPorts() allowed to use check doesn't work inside workers

[domenic]

If this's relevant global object's associated Document is not allowed to use the policy-controlled feature named "serial", reject promise with a "SecurityError" DOMException and return promise.

This's relevant global object does not have an associated Document when the method is called inside a worker.

Probably you want to check this's relevant global object's owner set[0]'s associated Document? If so, that's kind of awkward; maybe HTML should make this easier?

[domenic]

Bleh, it requires even more contortions to deal with nested workers: https://wicg.github.io/page-lifecycle/#dedicatedworkerglobalscope-owning-document

I'll at least try to upstream that from HTML...