<!DOCTYPE HTML>
<html>
<head>
<style>
body {
margin: 0px;
padding: 50px;
}
#myCanvas {
border: 1px solid #9C9898;
}
</style>
<script>
window.onload = function(){
var canvas = document.getElementById("myCanvas");
var context = canvas.getContext("2d");
var x = canvas.width / 2;
var y = canvas.height / 2 - 10;
var text = "Hello World!";
context.font = "30pt Calibri";
context.textAlign = "center";
context.fillStyle = "blue";
context.fillText(text, x, y);
// get text metrics
var metrics = context.measureText(text);
var width = metrics.width;
context.font = "20pt Calibri";
context.textAlign = "center";
context.fillStyle = "#555";
context.fillText("(" + width + "px wide)", x, y + 40);
};
</script>
</head>
<body onmousedown="return false;">
<canvas id="myCanvas" width="578" height="200">
</canvas>
</body>
</html>
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