ScreenShot JS

html2canvas(document.getElementById('page1'), {
  onrendered: function(canvas) {
    var tempcanvas = document.createElement('canvas');

    tempcanvas.width = 300;
    tempcanvas.height = 250;
    var context = tempcanvas.getContext('2d');
    context.drawImage(canvas, 0, 0, 300, 250, 0, 0, 300, 250);
    var link = document.createElement("a");
    link.href = tempcanvas.toDataURL('image/jpg'); //function blocks CORS
    link.download = 'screenshot.jpg';
    link.click();
  }
});