textBaseline:

your browser does not support the canvas tag

var c = document.getElementById('myCanvas');
var ctx = c.getContext('2d');
ctx.moveTo(5, 50);
ctx.lineTo(200, 50);
ctx.stroke();
ctx.textBaseline = 'alphabetic';
ctx.font='30px Arial';
ctx.fillText('Hello World', 20, 50);