textAlign

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>textAlign</title>
</head>
<body>

<canvas id="myCanvas" width="578" height="200" style="border: 1px solid #CCC;"></canvas>
    <script>
        var canvas = document.getElementById('myCanvas');
        var context = canvas.getContext('2d');
        var x = canvas.width / 2;
        var y = canvas.height / 2;

        context.font = '30pt Calibri';
        context.textAlign = 'center';
        context.strokeStyle = 'blue';
        context.strokeText('Hello World!',x,y);
    </script>

</body>
</html>