The HTMLHyperlinkElementUtils.hostname property is a USVString containing the domain of the URL.
string = object.hostname; object.hostname = string;
// Let's an <a id="myAnchor" href="https://developer.mozilla.org/en-US/docs/HTMLHyperlinkElementUtils.hostname"> element be in the document
var anchor = document.getElementByID("myAnchor");
var result = anchor.hostname; // Returns:'developer.mozilla.org' | Specification | Status | Comment | 
|---|---|---|
| HTML Living Standard The definition of 'URLUtils.hostname' in that specification.  |  Living Standard | Initial definition. | 
| Desktop | ||||||
|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | |
| Basic support |  Yes
  | 
Yes |  22
  | 
No | No | No | 
| Mobile | |||||||
|---|---|---|---|---|---|---|---|
| Android webview | Chrome for Android | Edge Mobile | Firefox for Android | Opera for Android | iOS Safari | Samsung Internet | |
| Basic support |  Yes
  | 
 Yes
  | 
Yes |  22
  | 
No | No | ? | 
HTMLHyperlinkElementUtils mixin it belongs to.
    © 2005–2018 Mozilla Developer Network and individual contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
    https://developer.mozilla.org/en-US/docs/Web/API/HTMLHyperlinkElementUtils/hostname