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Use the browser search function, middle click links and have it respect your settings, use the browser's spellchecker on a textbox, increasing the text size with reflowing, using screen readers, etc.

(Oh, and anything that Flash technically supports but doesn't do by default unlike HTML/CSS/JS is essentially the same as not having it, since we all know 90% of developers won't care).

Oh, and more recently, use new versions on Linux outside of Chrome: http://news.ycombinator.com/item?id=3780368

> Oh, and more recently, use new versions on Linux outside of Chrome

Or OSX. and use it at all for starters, still pegs my CPU doing trivial shit under OSX, even in Chrome.

Relative positioning. Floats. Fonts (dynamic of course; particularly targeting 9 and below - functional, but pretty buggy). Hardware accelerated transforms.

For games (and certainly banners)? I still think there's long way to go to catch up to Flash, even older Flash. http://news.ycombinator.com/item?id=680284

Like working flawlessly on all operating systems.