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Showing content from https://developer.mozilla.org/en-US/docs/Web/API/MediaRecorder/requestData below:

MediaRecorder: requestData() method - Web APIs

Baseline Widely available

The requestData() method of the MediaRecorder interface is used to raise a dataavailable event containing a Blob object of the captured media as it was when the method was called. This can then be grabbed and manipulated as you wish.

When the requestData() method is invoked, the browser queues a task that runs the following steps:

1. If MediaRecorder.state is "inactive", raise a DOM InvalidState error and terminate these steps. If MediaRecorder.state is not "inactive", continue to the next step.
2. Raise a dataavailable event containing a Blob of the currently captured data (the Blob is available under the event's data attribute.)
3. Create a new Blob and place subsequently captured data into it.

None.

None (undefined).

InvalidStateError DOMException

Thrown if the MediaRecorder is currently "inactive"; you cannot capture the recording if the MediaRecorder is not active.

captureMedia.onclick = () => {
  mediaRecorder.requestData();
  // makes snapshot available of data so far
  // ondataavailable fires, then capturing continues
  // in new Blob
};

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