Doesn't appear it's only Chrome that gets it "wrong," as it is _only_ IE that gets it "right."

https://developer.mozilla.org/en-US/docs/Web/API/HTMLAnchorE... writes:

  URLUtils.host
  Is a DOMString representing the hostname and port
  (if it's not the default port) in the referenced URL.

But it implements https://developer.mozilla.org/en-US/docs/Web/API/URLUtils (experimental), which writes:

  URLUtils.host
  Is a DOMString containing the host, that is the hostname,
  a ':', and the port of the URL.