A friend pointed me toward an excellent one-hour presentation on creating games in HTML5. I applied the animation techniques I learnt from the presentation to Dubbiya, my experimental browser-based database entity-relationship project. Click the "Animation" button and the background text follows a trigonometric path across the canvas.
Clearly this is not so useful yet. It is just a small test to understand the issues with animation in HTML5. I intend to use the technique to animate automatic changes to the diagram layout.