Document.domain

The domain property of the Document interface gets/sets the domain portion of the origin of the current document, as used by the same origin policy.

If this property is successfully set, the port part of the origin is also set to null.

Syntax

const domainString = document.domain
document.domain = domainString

Value

The domain portion of the current document's origin.

Exceptions

SecurityError

An attempt has been made to set domain under one of the following conditions:

• The document is inside a sandboxed <iframe>
• The document has no browsing context
• The document's effective domain is null
• The given value is not equal to the document's effective domain (or it is not a registerable domain suffix of it)
• The document-domain Feature-Policy is enabled

Examples

Getting the domain

For the URI http://developer.mozilla.org/docs/Web, this example sets currentDomain to the string "developer.mozilla.org".

const currentDomain = document.domain;

Closing a window

If a document, such as www.example.xxx/good.html, has the domain of "www.example.xxx", this example attempts to close the window.

const badDomain = "www.example.xxx";

if (document.domain === badDomain) {
  // Just an example: window.close() sometimes has no effect
  window.close();
}

Specifications

Browser compatibility

See also

• Same-origin policy