Can't save as png in chrome.

[jikkinikki]

Solution could be something like this:

function saveAsPNG() {
var oldSelectedObject = selectedObject;
selectedObject = null;
drawUsing(canvas.getContext('2d'));
selectedObject = oldSelectedObject;
var pngData = canvas.toDataURL('image/png');

var a = document.createElement('a');
    a.href = pngData;
    a.download = 'canvas.png';
    a.click();

}