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Some gadgets are no more than that, iframes that pass through information from another web site.
More advanced gadgets collect dynamic content and provide for interactive applications within your Sites pages. Gadgets consist of the following components: Gadgets built for Sites may be used by all viewers of a site.
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.
Therefore, Google recommends you build all Sites gadgets using the current gadgets.* API.
See this post for an explanation: is a simple but popular Include gadget that does little more than provide an iframe for passing through other web content: See Getting Started: gadgets.* API for a complete description of gadget tags and expected contents.
Warning: Gadgets built with the legacy gadgets API may work in Sites but are not officially supported.
Here are the high-level steps for building a gadget for Sites: Gadgets can be embedded in Sites pages either by selecting it from the Sites gadget directory (which is synchronized with the i Google gadget directory) or by including its URL directly.
Just remember, your gadget will have to be published in a public directory to be selected.
Otherwise, users must embed it by directly inserting its URL.
Gadget specs are cached unless you tell Sites not to.
To bypass the cache during development, add this to the end of the Sites page URL containing the gadget (and not the URL of the gadget spec file): parameters that can be configured.