Defines how the container element will layout the custom ReaderView content.
Defaults to FLEX_CENTER
Called when the custom content has been removed from the specified container element. Implement this method if you need to run any cleanup code such as removing event handlers.
Called when the application should render content into the specified container element.
The container element to render into.
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Interface used in methods where the client application is able to render custom content to the ReaderView. This can be used for rendering custom loading animations, localized error pages for the user, etc.