Update SpeechRecognitionResult with audio timing attributes#192
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Added audioStartTime and audioEndTime attributes to SpeechRecognitionResult interface with explanations as proposed in WebAudio#191
hoch
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Jul 14, 2026
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| <dl> | ||
| <dt><dfn attribute for=SpeechRecognitionResult>audioStartTime</dfn> attribute</dt> | ||
| <dd>A nullable {{DOMHighResTimeStamp}} representing the start of the audio segment corresponding to this recognition result, in milliseconds relative to the time origin. Returns null if the underlying recognition engine does not support audio segment start timestamps.</dd> |
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IIRC SpeechSynthesisEvent uses elapsedTime, which is float.
Is there a specific design reason for using DOMHighResTimeStamp here?
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No specific reason, I started with double? but it was suggested by @evanbliu to use DOMHighResTimeStamp? to mirror event.timeStamp property. I don't have a strong preference on this.
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IIUC, DOMHighResTimeStamp is just a typedef for a double but it makes it clear that the units are in milliseconds.
I assume SpeechSynthesisEvent uses float because DOMHighResTimeStamp didn't exist (or at least wasn't widely adopted) back in 2012.
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Added audioStartTime and audioEndTime attributes to SpeechRecognitionResult interface with explanations as proposed in #191.
Fixes: #191
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