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 anexperimental technology
Check theBrowser compatibility table carefully before using this in production.

The HTTPPermissions-Policy headerserial directive controls whether the current document is allowed to use theWeb 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() andSerial.getPorts() calls will return aPromise that rejects with aDOMException of typeSecurityError.