WordPress Customizer, Selective Refresh and Partials for Multiple Settings

There are several good references about how to set up the Customizer to avoid refreshing the entire page with each change. There’s one here, and there’s some deeper explanation here. What’s not described much is how to map several settings to a single area of the page (called a Partial).

This tutorial will go into updating Partials that use several settings. I assume you have already done the other tutorials.
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