WebSerial was just introduced in Firefox 151. It was already available for 5 years in Chromium based browser. It's so new in Firefox that even caniuse is not up-to-date: https://caniuse.com/web-serial.
WebSerial was just introduced in Firefox 151. It was already available for 5 years in Chromium based browser. It's so new in Firefox that even caniuse is not up-to-date: https://caniuse.com/web-serial.
Edge has had it for a while too.
interestingly, MDN web docs claims at the top of the Web Serial page (https://developer.mozilla.org/en-US/docs/Web/API/Web_Serial_...) that Chrome does not support it, even though the support table at the bottom shows that it supports all of the features (Firefox doesn't) and has for longer than Firefox
That's because Chrome on Android has a partial implementation of Web Serial. The banner on top is to get information at a glance vs the detailed breakdown of the compatibility table.