JSFiddle - React, Tailwind, and code Playground

JavaScript

function showPosition(position) {
    alert("[" + position.coords.latitude + " ; " + position.coords.longitude + "]");
}

if (navigator.geolocation) {
   navigator.geolocation.getCurrentPosition(showPosition);
} else {
    alert("ERR: Prohlizec nepodporuje Geolocation API");
}