Paper.js does not fill - test case

test.jade

!!! 5
html
  head
    script(src='js/paper.js', type='text/javascript')
    script(type='text/javascript')
      window.onload = function() {
        var canvas = document.getElementById('canvas');
        paper.setup(canvas);
        var rect = new paper.Path.Rectangle(new paper.Point(50, 50), new paper.Point(200, 200));
        rect.strokeColor = '#000000';
        rect.fillColor = '#ff0000';
        paper.view.draw();
      }
  body
    canvas(id='canvas', resize)