Value
The value is an empty string if the user navigated to the page directly (not through a link, but, for example, by using a bookmark). Because this property returns only a string, it doesn't give you document object model (DOM) access to the referring page.
Inside an <iframe>, the Document.referrer will initially
be set to the href of the parent's
Window.location in same-origin requests.
In cross-origin requests, it's the origin of the parent's Window.location by default.
For more information, see the Referrer-Policy: strict-origin-when-cross-origin documentation.
Examples
The following will log a string containing the document's referrer.
js
console.log(document.referrer);
If the user navigated to the page via a link like <a href="https://www.w3.org/">W3</a>, then it will output the previous domain like developer.mozilla.org. If the user navigated to the page directly, it will output an empty string.
Specifications
| Specification |
|---|
| HTML # dom-document-referrer-dev |