This demo is done with using Google's Web Speech API. The new JavaScript Web Speech API makes it easy to add speech recognition to our web pages.

This API allows fine control and flexibility over the speech recognition capabilities in Chrome version 25 and later. Here's an example with the sample demo which will respond immediately while speaking.

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Let's try simple one...

    Say "Hello!"

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Let's try something more interesting...

    Say "Show me your picture!"

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That's cool. But in the real world it's not all hello and my picture...

    Say "Show Expense Report!"

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That's it. From this blog you all seen a Google's Web Speech API "Hands On" Demo in some fun ideas. For documentation, refer Web Speech API.