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In addition to recognizing the default DITA topic formats, topic specializations can also be edited in Author mode.

The content completion should work without additional modifications and you can choose the tags that are allowed at the cursor position.

The CSS styles used for rendering the elements should also work on the specialized topics without additional modifications.

The toolbar/menu actions should be customized to insert the correct element names. You can go to the DITA document type from the Document Type Association preferences page and edit the actions to insert the element names, as specified in your specialization. See Creating/Extending a Custom Framework for more details.