Permissions-Policy: serial 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 serial directive controls whether the current document is allowed to use the Web Serial API to communicate with serial devices, either directly connected via a serial port, or via USB or Bluetooth devices emulating a serial port.

Specifically, where a defined policy blocks use of this feature, Serial.requestPort() and Serial.getPorts() calls will return a Promise that rejects with a DOMException of type SecurityError.