ChromeOS Dictation (Chromium developer documentation)

“Dictation is a ChromeOS accessibility feature that allows users to type and edit ... text with their voice.” (Introduction)

“it will automatically turn off if no speech has been recognized within a short period of time.” (Summary, User flow)

“it will execute the command to the best of its ability; otherwise it will input ... the recognized text as-is.” (Summary, User flow)

“Dictation can only be used when focus is on an editable field (textarea, input, contenteditable, etc).” (Summary, User flow)

“when SODA isn’t available, Dictation falls back to network speech recognition.” (Summary, Technical overview)

“SODA stands for “speech on-device API” and turns the user’s speech into text on-device (without sending it to a Google server).” (Summary, Technical overview)

“Dictation can be toggled on in two ways: by pressing Search + D or by pressing the microphone icon” (Summary, User flow)

“falls back to regex-based speech parsing.” (Technical overview)

“Pumpkin is a semantic parser that allows Dictation to extract meaning out of recognized text.” (Technical overview)