HTML <area> referrerpolicy Atribut
Příklad
Nastavte atribut referrerpolicy pro hypertextové odkazy oblasti:
<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>
Definice a použití
Atribut referrerpolicyurčuje, které informace o refereru se mají odeslat, když uživatel klikne na hypertextový odkaz.
Podpora prohlížeče
Čísla v tabulce určují první verzi prohlížeče, která tento atribut plně podporuje.
| Attribute | |||||
|---|---|---|---|---|---|
| referrerpolicy | 51.0 | 79.0 | 50.0 | 11.1 | 38.0 |
Syntax
<area referrerpolicy="no-referrer|no-referrer-when-downgrade|origin|origin-when-cross-origin|same-origin|strict-origin-when-cross-origin|unsafe-url">
Hodnoty atributů
| 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! |
❮ HTML tag <area>