Atributo de política de referência HTML <área>
Exemplo
Defina o atributo referrerpolicy para os hiperlinks de área:
<map name="planetmap">
<area shape="rect" coords="0,0,82,126" href="sun.htm"
alt="Sun" referrerpolicy="same-origin">
<area shape="circle" coords="90,58,3"
href="mercur.htm" alt="Mercury" referrerpolicy="same-origin">
<area
shape="circle" coords="124,58,8" href="venus.htm" alt="Venus" referrerpolicy="same-origin">
</map>
Definição e uso
O referrerpolicyatributo especifica quais informações do referenciador enviar quando o usuário clicar no hiperlink.
Suporte ao navegador
Os números na tabela especificam a primeira versão do navegador que suporta totalmente o atributo.
| Attribute | |||||
|---|---|---|---|---|---|
| referrerpolicy | 51.0 | 79.0 | 50.0 | 11.1 | 38.0 |
Sintaxe
<area referrerpolicy="no-referrer|no-referrer-when-downgrade|origin|origin-when-cross-origin|same-origin|strict-origin-when-cross-origin|unsafe-url">
Valores de atributo
| Value | Description |
|---|---|
| no-referrer | No referrer information is sent |
| no-referrer-when-downgrade | Default. Sends the origin, path, and query string if the protocol security level stays the same or is higher (HTTP to HTTP, HTTPS to HTTPS, HTTP to HTTPS is ok). Sends nothing to less secure level (HTTPS to HTTP is not ok) |
| origin | Sends the origin (scheme, host, and port) of the document |
| origin-when-cross-origin | Sends the origin of the document for cross-origin request. Sends the origin, path, and query string for same-origin request |
| same-origin | Sends a referrer for same-origin request. Sends no referrer for cross-origin request |
| strict-origin-when-cross-origin | Sends the origin if the protocol security level stays the same or is higher (HTTP to HTTP, HTTPS to HTTPS, and HTTP to HTTPS is ok). Sends nothing to less secure level (HTTPS to HTTP) |
| unsafe-url | Sends the origin, path, and query string (regardless of security). Use this value carefully! |
❮ Tag HTML <área>