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You don't need to regenerate any HTML and changes are instant. Also, I honestly don't think one can burn through too much CPU with occasional JavaScript. This is some hardcore environmentalism.

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It's not environmentalism, it's just common sense politeness. There is no reason a users web-browser should have to render something twice just for static content. All just to save you a single `make` before uploading.

I've been joking for a few years that it's only a matter of time until some joker implements a browser in javascript/html5 and the rest of the web development community enthusiastically adopts using it as standard practice. I'm starting to fear that this is more of a possibility than I initially thought.

I doubt that translating a few hundred lines of Markdown into HTML with an efficient JavaScript JIT is noticeably more expensive than, say, decoding a big JPEG picture or displaying a Flash ad, or having menu items slide in and out.

1) It's the principle of the matter. 2) That it might be even comparable to those things is a pretty strong argument against it, afaic.

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