Headers: Supports-Loading-Mode

Supports-Loading-Mode header

Limited availability

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

Want more support for this feature? Tell us why.

Learn more
See full compatibility

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
CORS-safelisted response header	No

Syntax

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: 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

Supports-Loading-Mode: fenced-frame

Specifications

Specification
Prerendering Revamped> # supports-loading-mode>

Browser compatibility

	Desktop					Mobile
	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`	109	109	No	95	No	109	No	74	No	21.0	109	No
`credentialed-prerender`	109	109	No	95	No	109	No	74	No	21.0	109	No
`fenced-frame`	117	117	No	103	No	117	No	78	No	24.0	117	No