Usage of "effective domain" seems wrong

[annevk]

No other specification really ought to use "effective domain". That's only for document.domain-related business. I suspect you just want to grab an origin's host and ignore this operation.

[nicksteele]

Why is it only for document.domain-related business? Unclear why we can't use effective domain.

[annevk]

Because the domain field is only set when document.domain is used. Generally that's an internal field for the HTML Standard.

[agl]

Thanks for that. I think from the [definition of effective domain] we want to skip the second step, yes? Is there a standard name for "the origin's host or null if the origin is opaque"?

[annevk]

No, but your algorithm already returns early for an opaque origin in the prior step.