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Playing WAV files out of data: URIs does't rely on Quicktime, does it? JS909 was pure JS, although it was more of a clever hack than a programming feat.

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There is currently no "A-grade" way of providing audio using only JavaScript. The best fallback is flash, unfortunately.

And probably the best flash->JS library: http://www.schillmania.com/projects/soundmanager2/

IIRC, Netscape introduced some JavaScript functions for playing audio, but those rely on the browser having a plug-in to play it.

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