Create a web page

Create a file index.html and include the following:

<html>
    <body>
        <script type="text/javascript" src="out/main.js"></script>
    </body>
</html>

Open this file in a browser and open the JavaScript developer console so you can see the output. Nothing will appear in the main browser window as no content is rendered.

You will not see "Hello world!" but instead you will likely see an error like the following:

Uncaught ReferenceError: goog is not defined

In order to understand this error we must examine a few basics around the Google Closure Library. While the following section may seem somewhat roundabout, a short review on how Google Closure Library works will make simple bugs considerably easier to spot.

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