This API checks the document for SDT (Structured Document Tag) elements like date pickers or drop-down lists from Microsoft Word's Developer tab,
removes such content controls, and converts them to plain text elements. The API then opens the converted checked-out document in a new Word instance.
OfficeJS does not support SDT elements except rich text format (RTF) fields (https://docs.microsoft.com/en-us/javascript/api/word/word.contentcontrolcollection?view=word-js-preview)