Supports-Loading-Mode header

Limited availability

This feature is not Baseline because it does not work in some of the most widely-used browsers.

Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The HTTP Supports-Loading-Mode response header allows a response to opt-in to being loaded in a novel, higher-risk context that it would otherwise fail to be loaded in.

Header type	Response header
Forbidden request header	No
CORS-safelisted response header	No

Syntax

http

Supports-Loading-Mode: <client-hint-headers>

Directives

The Supports-Loading-Mode header value is a list of one or more tokens, which can include the following values:

credentialed-prerender Experimental: Indicates that a destination origin opts in to loading documents via cross-origin, same-site prerendering.
fenced-frame Experimental: The response can loaded inside a fenced frame. Without this explicit opt-in, all navigations inside of a fenced frame will fail.