Official documentation

SpeechRecognition interface (Web Speech API)

MDN Web Docs (Mozilla), 2026

Read on October 17, 2026

What it is: Mozilla's reference page for the SpeechRecognition interface. It says that in Chrome, speech recognition on a web page uses a server-based recognition engine, and it marks the feature as limited availability rather than Baseline.
How much weight it carries: Maintained by Mozilla's documentation team and revised regularly. It describes browser behavior in general terms, so the exact versions come from the compatibility data, which is cited separately.

Facts taken from this source

MDN says that on some browsers, including Chrome, speech recognition on a web page uses a server-based engine, and the audio is sent to a web service.
“On some browsers, like Chrome, using Speech Recognition on a web page involves a server-based recognition engine. Your audio is sent to a web service for recognition processing, so it won't work offline.” (Note under the introduction)