modernizr/feature-detects/speech/speech-synthesis.js

Modernizr is a JavaScript library that detects HTML5 and CSS3 features in the user’s browser.

/*!
{
  "authors": ["Cătălin Mariș"],
  "name": "Speech Synthesis API",
  "notes": [
    {
      "name": "W3C Web Speech API Specification - The SpeechSynthesis Interface",
      "href": "https://dvcs.w3.org/hg/speech-api/raw-file/tip/speechapi.html#tts-section"
    }
  ],
  "property": "speechsynthesis",
  "tags": ["input", "speech"]
}
!*/

define(['Modernizr'], function(Modernizr) {
  Modernizr.addTest('speechsynthesis', 'SpeechSynthesisUtterance' in window);
});