1 var canvas = document.getElementById('tutorial');

     2 

     3   // Make sure we don't execute when canvas isn't supported

     4   if (canvas.getContext){

     5 

     6     // use getContext to use the canvas for drawing

     7     var ctx = canvas.getContext('2d');

     8 

     9     // Filled triangle

    10     ctx.beginPath();

    11     ctx.moveTo(25,25);

    12     ctx.lineTo(105,25);

    13     ctx.lineTo(25,105);

    14     ctx.fill();

    15     

    16     // Stroked triangle

    17     ctx.beginPath();

    18     ctx.moveTo(125,125);

    19     ctx.lineTo(125,45);

    20     ctx.lineTo(45,125);

    21     ctx.closePath();

    22     ctx.stroke();

    23 

    24   }