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In its simplest form, a gadget is a small file that retrieves information with the ability to make it available in multiple web pages at once.
In Sites, including a gadget results in an iframe that acts as the conduit for this external information.
At Google, gadgets are HTML and Java Script applications that can be embedded in web pages and other apps, including Sites.
These gadgets offer the ability to include external and dynamic content within your site, such as miniature applications and database-driven lists, incorporated with text and images for a seamless user experience. What's more, Sites offers a Data API that may be used in conjunction with gadgets to create powerful applications.
Built-in and feed-based gadgets are similarly not supported.See the Embedding your gadget section for precise steps.The functionality and appearance of your gadget depends on the site that contains it.Test updating various configuration values and adding your gadget to your test site.Confirm your gadget works as expected on the site itself.
Therefore, the best way to debug your gadget is to test it in the context of an actual Google Site.