HTML <area> referrerpolicy attribute
Definition and Usage
referrerpolicy The attribute specifies the referrer information (referrer information) to be sent when the user clicks on a hyperlink.
Example
Set the referrerpolicy attribute for area hyperlinks:
<map name="planetmap"> <area shape="rect" coords="0,0,114,576" href="sun.html" referrerpolicy="same-origin"> <area shape="circle" coords="190,230,5" href="mercur.html" referrerpolicy="same-origin"> <area shape="circle" coords="228,230,5" href="venus.html" referrerpolicy="same-origin"> </map>
Syntax
<area referrerpolicy="no-referrer|no-referrer-when-downgrade|origin|origin-when-cross-origin|same-origin|strict-origin-when-cross-origin|unsafe-url">
Attribute value
| Value | Description |
|---|---|
| no-referrer | Do not send referrer information. |
| no-referrer-when-downgrade | Default. Send the origin, path, and query string if the protocol security level remains the same or higher (HTTP to HTTP, HTTPS to HTTPS, HTTP to HTTPS are all possible). Do not send any content to a lower security level (HTTPS to HTTP is not allowed). |
| origin | Send the document's source (protocol, host, and port). |
| origin-when-cross-origin | For cross-origin requests, send the document's source. For same-origin requests, send the source, path, and query string. |
| same-origin | For same-origin requests, send reference page information. For cross-origin requests, do not send reference page information. |
| strict-origin-when-cross-origin | If the protocol security level remains unchanged or higher (HTTP to HTTP, HTTPS to HTTPS, and HTTP to HTTPS are all acceptable), send the source. For less secure levels (from HTTPS to HTTP), do not send any content. |
| unsafe-url | Send the source, path, and query string (without considering security). Use this value with caution! |
Browser Support
The numbers in the table indicate the first browser version to fully support the attribute.
| Chrome | Edge | Firefox | Safari | Opera |
|---|---|---|---|---|
| Chrome | Edge | Firefox | Safari | Opera |
| 51.0 | 79.0 | 50.0 | 11.1 | 38.0 |
