When I was training for AWS, we did a really cool project where we learned how to make a Javascript based page that uses AWS Polly, a text to audio translator.
https://tensigh-mypollywebsite-nv.s3.amazonaws.com/index.html
You enter text into the text box and it will convert it to an mp3 which you can play or download, and you can choose from a variety of accents. All of this runs without a web server.