.disp-none {
display: none;
}
<div class="modal fade disp-none" ...>
...
...
modal.classList.remove('disp-none');
...
modal.classList.add('disp-none');
...
npx live-server . --port=3000
canvas.onmousemove = function (evt) {
canvas.dispatchEvent(new MouseEvent('mousedown', evt));
canvas.dispatchEvent(new MouseEvent('mousemove', evt));
}