Javascript table generation

    (function () {
        var table = document.createElement('table');
        for (var i = 0; i < 42; i++) { //24
            var row = table.insertRow(i);
            for (var j = 0; j < 42; j++) {
                row.insertCell(j);
            }
        }
        document.querySelector('.display').appendChild(table);
    })();

    var getPixel = function (x, y) {
        return document.querySelector(`.display table tr:nth-child(${y + 1}) td:nth-child(${x + 1})`);
    }