JSFiddle - React, Tailwind, and code Playground

JavaScript

function pad(n) {
        return n.length < 2 ? "0" + n : n;
    }

    var array = new Uint8Array(3);
    array[0] = 0xe2;
    array[1] = 0x82;
    array[2] = 0xac;

    var str = "";
    for (var i = 0, len = array.length; i < len; ++i) {
        str += ("%" + pad(array[i].toString(16)))
    }

    str = decodeURIComponent(str);

    alert(str);