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An old boring website?

No, that isn't that difficult.

Try to do an interactive webap.

Definitely. Something as simple as a bookmarklet can become hell with all the IE-specific rules for cross domain messaging, third party cookies and the like. We're still trying to be IE-compatible but man it does take a hell lot of time.

AFAICT, jQuery is a general purpose library, not one meant to build bleeding edge web apps.

There's different versions of jQuery. If you require a version that supports older browsers, you might not be able to use the bleeding-edge version. The current libraries will continue to work as they always have. There's no reason for newer versions to be limited by outdated browsers. Developers are free to choose the version they want to use.

New versions do not need to be limited by old browsers. Why not build a mutable API? Your browser doesn't support canvas? Oh, too bad, but the Canvas module will just be undefined so you, the developer, can choose what to do with your user.

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