[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.