I leaned heavily on Bill Mill's HTML5 Canvas tutorial, available here. It employs a jQuery function which let's users use their arrow keys or their mouse to control the paddle. The page layout is liquid, meaning it is sized to your browser window on launch. If you resize your browser window, you may have to hit the reload button to reset the layout to your new browser dimensions. You can toggle sound on and off by clicking the speaker icon on top.
It will not work in IE, but should work in current versions of Safari, Chrome, Opera and FireFox. It plays via the accelerometer (slowly) on iPads and iPhones, .