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For CSS, perhaps you're right. For Javascript, it may only take an extra hour or so to monkeypatch their JS implementations for things like Array.indexOf().

Now many of the things I do involve Canvas and SVG for information display. Try a map of the United States with a few layers of SVG with a few thousand datapoints. It simply won't happen on IE <= 9. You can try all the shims all day long. It just won't work.

Saying "it's not that hard" means you haven't tried anything more than CSS2 box model stuff.

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