Permissions-Policy: usb directive

Limited availability

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

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

The HTTP Permissions-Policy header usb directive controls whether the current document is allowed to use the WebUSB API.

Specifically, where a defined policy blocks WebHID usage, the Navigator.usb property will not be available.

Syntax

http

Permissions-Policy: usb=<allowlist>;

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

The default allowlist for usb is self.

Specification
WebUSB API # permissions-policy

	desktop					mobile
	Chrome	Edge	Firefox	Opera	Safari	Chrome Android	Firefox for Android	Opera Android	Safari on iOS	Samsung Internet	WebView Android	WebView on iOS
`usb` Experimental	Chrome – Full support Chrome 88 (Release date: 2021-01-19) footnote Full support	Edge – Full support Edge 88 (Release date: 2021-01-21) footnote Full support	Firefox – No support Firefox footnote No support	Opera – Full support Opera 74 (Release date: 2021-02-02) footnote Full support	Safari – No support Safari footnote No support	Chrome Android – Full support Chrome Android 88 (Release date: 2021-01-19) footnote Full support	Firefox for Android – No support Firefox for Android footnote No support	Opera Android – Full support Opera Android 63 (Release date: 2021-04-16) footnote Full support	Safari on iOS – No support Safari on iOS footnote No support	Samsung Internet – Full support Samsung Internet 15 (Release date: 2021-08-13) footnote Full support	WebView Android – No support WebView Android footnote No support	WebView on iOS – No support WebView on iOS footnote No support

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