Custom styles, timelines, and behaviors are fully supported for templates. However, any document that uses a template cannot have its own style sheet, timelines, or behaviors; it must use the style sheet, timelines, and behaviors defined for the template. This is because styles, timelines, and behaviors all have components in the HEAD of document, which is not editable in documents that use templates.
Styles, timelines, and behaviors can be applied only to editable regions of a document that uses templates. For more information on using styles, see Formatting text with style sheets. For more information on timelines and behaviors, see Interactivity and animation overview.