text: 
          function alterar() {
              var element = document.getElementsByTagName('div');
              element[0].innerHTML = "Hallo Welt!";
              return element;
          }   
  
          var c = document.getElementById("myCanvas");
          var ctx = c.getContext("2d");
          ctx.moveTo(0,0);
          ctx.lineTo(200,100);
          ctx.stroke();
  