The URL is being passed into an <a> tag href value. Checking Mozilla documentation, it makes it quite clear. "Is a DOMString representing the hostname and port

The URL is being passed into an <a> tag href value. Checking Mozilla documentation, it makes it quite clear. "Is a DOMString representing the hostname and port (if it's not the default port) in the referenced URL." https://developer.mozilla.org/en-US/docs/Web/API/HTMLAnchorElement https://developer.mozilla.org/en-US/docs/Web/API/HTMLAnchorE... So IE is getting it wrong? Edit: Other post points out experimental standard which IE may be adopting.