1. Remake Clear in CSS3 2. Post it on hacker news 3. ALL of the upvotes
It's basically demo-ware.
Of course it's not a complete replacement for the native app. Not everything can be done using HTML, such as the pull to create a new task. For that you probably would have to find another way if this was build from the ground up without prior knowledge of the native app.
Maybe I'll start with this and add localStorage?