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api.SpeechSynthesisEvent - .utterance is not supported by iOS Safari #16864

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12Me21 opened this issue Jul 7, 2022 · 1 comment · Fixed by #25702
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api.SpeechSynthesisEvent - .utterance is not supported by iOS Safari #16864

12Me21 opened this issue Jul 7, 2022 · 1 comment · Fixed by #25702
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@caugner
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data:api Compat data for Web APIs. https://developer.mozilla.org/docs/Web/API

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@12Me21
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12Me21 commented Jul 7, 2022 •
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What type of issue is this?

Incorrect support data (ex. Chrome says "86" but support was added in "40")

What information was incorrect, unhelpful, or incomplete?

compat data claims that SpeechSynthesisEvent's utterance property has been supported since iOS safari 7 (from ~2013), but this property doesn't exist

What browsers does this problem apply to, if applicable?

Safari

What did you expect to see?

No response

Did you test this? If so, how?

I've checked the properties of a SpeechSynthesisEvent instance on iOS Safari 15.5 (latest version), and it only has the following:

  • Own keys:
    • isTrusted
  • From SpeechSynthesisEvent.prototype:
    • constructor
    • charIndex
    • elapsedTime
    • name
    • @@toStringTag
  • (as well as keys from Event.prototype and Object.prototype)

Can you link to any release notes, bugs, pull requests, or MDN pages related to this?

No response

Do you have anything more you want to share?

It also seems that iOS Safari doesn't have a SpeechSynthesis class, only the window.speechSynthesis instance, which has no .constructor and inherits from Object instead of EventTarget.
So, it's not possible to attach events to SpeechSynthesis, only SpeechSynthesisUtterance (which does inherit from EventTarget)

MDN URL

https://developer.mozilla.org/en-US/docs/Web/API/SpeechSynthesisEvent

MDN metadata

MDN page report details
  • Query: api.SpeechSynthesisEvent
  • Report started: 2022-07-07T06:47:39.905Z
@queengooborg queengooborg added the data:api Compat data for Web APIs. https://developer.mozilla.org/docs/Web/API label Jul 7, 2022
@caugner
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caugner commented Jan 17, 2025 •
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Tested via BrowserStack Live and a local server printing the result of Object.keys(SpeechSynthesisEvent.prototype):

  • ❌ iOS 11.2 - only charIndex, elapsedTime, name
  • ❌ iOS 12.3 - only charIndex, elapsedTime, name
  • ❌ iOS 13.3 - only charIndex, elapsedTime, name
  • ❌ iOS 13.6 - only charIndex, elapsedTime, name
  • ❌ iOS 14.0 - only charIndex, elapsedTime, name
  • ❌ iOS 14.7 - only charIndex, elapsedTime, name
  • ❌ iOS 15.0 - only charIndex, elapsedTime, name
  • ❌ iOS 15.4 - only charIndex, elapsedTime, name
  • ✅ iOS 16.0 - utterance, charIndex, charLength, elapsedTime, name
  • ✅ iOS 16.5 - utterance, charIndex, charLength, elapsedTime, name
  • ✅ iOS 17.0 - utterance, charIndex, charLength, elapsedTime, name
  • ✅ iOS 17.1 - utterance, charIndex, charLength, elapsedTime, name
  • ✅ iOS 18.0 - utterance, charIndex, charLength, elapsedTime, name
  • ✅ iOS 18.2 - utterance, charIndex, charLength, elapsedTime, name

@caugner caugner self-assigned this Jan 17, 2025
@caugner caugner mentioned this issue Jan 17, 2025
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Safari iOS 16 added SpeechSynthesisEvent.utterance mdn/browser-compat-data
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@caugner @12Me21 @queengooborg