[toyg]

Partially, but the point is that you're (manually and expensively) reinventing the wheel that desktop toolkits had already built for you.

[ZenoArrow]

Sure, but with the end benefit being a universal UI toolkit.

Also, 'expensively' is debatable, I'm sure it'd be possible to have reusable accessibility components, wouldn't necessarily have to reinvent the wheel for each new web app.