Why can't I draw two lines of varying colors in my HTML5 canvas?

Question

I am trying to use HTML5 canvas to draw a red line to the left of a green line. Here is my javascript:

var canvas = document.createElement('canvas');
canvas.height = 150;
canvas.width = 150;
var canvasContext = canvas.getContext('2d');
canvasContext.beginPath();

// Draw the red line.
canvasContext.strokeStyle = '#f00';
canvasContext.moveTo(10, 0);
canvasContext.lineTo(10, 100);
canvasContext.stroke();

// Draw the green line.
canvasContext.moveTo(50, 0);
canvasContext.strokeStyle = '#0f0';
canvasContext.lineTo(50, 100);
canvasContext.stroke();

document.body.appendChild(canvas);​

However, in Google Chrome, I get a dark green line to the left of a light green line. Why? I called stroke twice right? Hence, why should my first stroke affect my second one?

Here is a JSFiddle that illustrates what I mean.

Answer 1

You aren't calling canvasContext.beginPath(); when you start drawing your second line.

To make the drawing sections more independent, I added whitespace:

var canvas = document.createElement('canvas');
canvas.height = 150;
canvas.width = 150;

var canvasContext = canvas.getContext('2d');

// Draw the red line.
canvasContext.beginPath();
canvasContext.strokeStyle = '#f00';
canvasContext.moveTo(10, 0);
canvasContext.lineTo(10, 100);
canvasContext.stroke();

// Draw the green line.
canvasContext.beginPath();
canvasContext.moveTo(50, 0);
canvasContext.strokeStyle = '#0f0';
canvasContext.lineTo(50, 100);
canvasContext.stroke();

document.body.appendChild(canvas); 

Demo: http://jsfiddle.net/AhdJr/2/