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Wrap the code that updates the HTML with changes from the server with code that stores and re-applies specified classes. This is to allow other JS to add classes which change the visual state of the HTML without them being considered by the code that diffs our in-page HTML against that from the server. They are called classesToPersist because this should make the visual state they create persist between updates. Includes the addition of tests for updateContent that cover the addition/deletion of elements so we can write a test for classNames persisting through updates. The existing tests only cover updates that change the content of elements. Just adding the test for these changes to those would simulate a scenario that doesn't exist in the app. Writing extra tests for the kind of updates these changes act on keeps them in line with the app code.