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Showing content from https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Permissions-Policy/web-share below:

Permissions-Policy: web-share directive - HTTP

Permissions-Policy: web-share directive

Limited availability

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

The HTTP Permissions-Policy header web-share directive controls whether the current document is allowed to use the Navigator.share() method of the Web Share API to share text, links, images, and other content to arbitrary destinations of the user's choice.

Specifically, where a defined policy blocks usage of this feature, Navigator.share() calls will return a Promise that rejects with a DOMException of type NotAllowedError.

Syntax
Permissions-Policy: web-share=<allowlist>;
<allowlist>

A list of origins for which permission is granted to use the feature. See Permissions-Policy > Syntax for more details.

Default policy

The default allowlist for web-share is self.

Specifications Browser compatibility See also

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