Supports-Loading-Mode

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 header name 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

The response can loaded inside a fenced frame. Without this explicit opt-in, all navigations inside of a fenced frame will fail.

Examples

http
Supports-Loading-Mode: fenced-frame

Specifications

Specification
Prerendering Revamped
# supports-loading-mode

Browser compatibility

Report problems with this compatibility data on GitHub
desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
Supports-Loading-Mode
Experimental
credentialed-prerender directive
Experimental
fenced-frames directive
Experimental

Legend

Tip: you can click/tap on a cell for more information.

Full support
Full support
No support
No support
Experimental. Expect behavior to change in the future.

See also