if (viewbox) {
let coords = viewbox.split(','); // <x1>,<y1>,<x2>,<y2>
let bounds = L.latLngBounds([coords[1], coords[0]], [coords[3], coords[2]]);
if (viewbox) {
let coords = viewbox.split(','); // <x1>,<y1>,<x2>,<y2>
let bounds = L.latLngBounds([coords[1], coords[0]], [coords[3], coords[2]]);