title: speechSynthesis.speak() works on iPhone but not iPad?
body: <p>I have a webapp that uses speechSynthesis.speak() that seems to work in Safari, Chrome and Firefox on my Mac. It also works on my iPhone 6 (iOS 11.2.5) but not on my iPad Pro (also iOS 11.2.5). The initial call to speak() is from a user button onclick function.</p>
  
  <p>Yes, I have the iPad volume turned up...</p>
  
  <p>On the iPad I get start and end events that look correct, without any error events. I tried setting the volume, language, and voice in the utterance object to no avail. The API seems to be working, but nothing's coming out.</p>
  
  <p>Does anyone know of iOS settings that affect speechSynthesis.speak()?
  Any other suggestions?</p>