[kevincennis]

I'm a little surprised to have not seen any mention of the Speech Synthesis API (https://caniuse.com/#feat=speech-synthesis).

It's supported almost everywhere that the Web Audio API is.

[est31]

For me, running window.speechSynthesis.getVoices() in the web console of both Firefox and Chromium results in an empty list. Any idea how to populate it? Using ubuntu packages of Firefox/Chromium. Nor does this demo work in any of the two: http://mdn.github.io/web-speech-api/speak-easy-synthesis/

[Etheryte]

On macOS, the returned list contains the built-in operating system voices (about 50) and some additional ones by Google (roughly 20). The spec [1] says the voices made available are entirely up to the browser. Doesn't really answer your question, but at least some additional insight.

[1] https://w3c.github.io/speech-api/#dom-speechsynthesis-getvoi...

[est31]

Thanks for confirming that I'm looking at the right list!

[jajag]

It can take a while for the full voice list to load after speech synthesis is initialized on the page - try calling getVoices() again after a small delay.

[codegladiator]

This worked. First time I got an empty array. Second time I see an array with 47 items.

[masswerk]

This project is older (2011) than the Web Speech API.

(However, one of the scenarios for a version 2.0 was to implement the same API, additionally to the 'native' one, to be used as a fallback solution. While I actually had implemented this already, I don't think it may be that useful, while it increases file size quite a bit.)

Edit: Viable points for this may be still a) reliable performance and interaction, and b) known voices (even, if they are a bit robotic), c) use in offline applications. Using an analyser node for animations may be yet another.