HTMLScriptElement.referrerPolicy

The referrerPolicy property of the HTMLScriptElement interface reflects the HTML referrerpolicy of the <script> element and fetches made by that script, defining which referrer is sent when fetching the resource.

Syntax

refStr = scriptElem.referrerPolicy;
scriptElem.referrerPolicy = refStr;

Value

A DOMString; one of the following:

no-referrer
The Referer header will be omitted entirely. No referrer information is sent along with requests.
no-referrer-when-downgrade (default)
This is the user agent's default behavior if no policy is specified. The URL is sent as a referrer when the protocol security level stays the same (e.g.HTTP→HTTP, HTTPS→HTTPS), but isn't sent to a less secure destination (e.g. HTTPS→HTTP).
origin
Only send the origin of the document as the referrer in all cases.
The document https://example.com/page.html will send the referrer https://example.com/.
origin-when-cross-origin
Send a full URL when performing a same-origin request, but only send the origin of the document for other cases.
same-origin
A referrer will be sent for same-site origins, but cross-origin requests will contain no referrer information.
strict-origin
Only send the origin of the document as the referrer when the protocol security level stays the same (e.g. HTTPS→HTTPS), but don't send it to a less secure destination (e.g. HTTPS→HTTP).
strict-origin-when-cross-origin
Send a full URL when performing a same-origin request, only send the origin when the protocol security level stays the same (e.g. HTTPS→HTTPS), and send no header to a less secure destination (e.g. HTTPS→HTTP).
unsafe-url
Send a full URL when performing a same-origin or cross-origin request. This policy will leak origins and paths from TLS-protected resources to insecure origins. Carefully consider the impact of this setting.

Note: An empty string value ("") is both the default value, and a fallback value if referrerpolicy is not supported. If referrerpolicy is not explicitly specified on the <script> element, it will adopt a higher-level referrer policy, i.e. one set on the whole document or domain. If a higher-level policy is not available, the empty string is treated as being equivalent to no-referrer-when-downgrade.

Examples

var scriptElem = document.createElement("script");
scriptElem.src = "/";
scriptElem.referrerPolicy = "unsafe-url";
document.body.appendChild(script);

Specifications

Specification Status Comment
Referrer Policy
The definition of 'referrerpolicy attribute' in that specification.
Candidate Recommendation Added the referrerPolicy attribute.
HTML Living Standard
The definition of 'HTMLScriptElement: referrerPolicy' in that specification.
Living Standard  

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
referrerPolicyChrome Full support 70Edge ? Firefox Full support 65IE No support NoOpera Full support YesSafari No support NoWebView Android Full support 70Chrome Android Full support 70Edge Mobile ? Firefox Android Full support 65Opera Android Full support YesSafari iOS No support NoSamsung Internet Android ?

Legend

Full support  
Full support
No support  
No support
Compatibility unknown  
Compatibility unknown

See also

Document Tags and Contributors

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