Online Intonation is a set of web pages I wrote in 2001-02. I have been aware for some time that it no longer worked well in some modern browsers and have been studiously avoiding doing anything about this sad situation. Then, yesterday, I received wonderful news from my colleague, Mark Huckvale. He had hacked my stuff and made it work in Chrome and Firefox. Many thanks and much respect to him!
You can find it here. I have checked that it works well in MSIE, Safari, Avant, Seamonkey. I can’t get the sound to work in Opera, though, and that’s a mystery.