How does the browser magically see React changes in development?

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Several months ago I was new to React. As an experienced developer of classic javascript, one of the most objectionable things about the newer thick client frameworks such as React and Angular is the need to build the client side application to see changes. Let's face it, we are used to only having to refresh the browser page. Fortunately for us the community has has helped us out with this issue, specifically the Create React App community. So you install Node.js, follow all their instructions and just like magic suddenly the browser refreshes every time you make a change, but how does this happen? The answer is more simple and more complex than you think.

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