Re: [whatwg/url] Clarify that a domain is never empty (#492)

@annevk commented on this pull request.



> @@ -255,8 +255,9 @@ identifier in <a for=/>URLs</a> where a network address is not necessary.
 have no influence on <a for=/>host</a> writing, parsing, and serialization. Unless stated otherwise
 in the sections that follow.
 
-<p>A <dfn export id=concept-domain>domain</dfn> is an <a>ASCII string</a> that identifies a realm
-within a network.
+<p>A <dfn export id=concept-domain>domain</dfn> is a non-empty <a>ASCII string</a> that identifies a
+realm within a network.
+

```suggestion
```

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