## add(item) {#sdtlistitem} Adds an item to this collection. ```js add(item: Aspose.Words.Markup.SdtListItem) ``` | Parameter | Type | Description | | --- | --- | --- | | item | [SdtListItem](../........let doc = new aw.Document(); let tag = new aw.Markup.StructuredDocumentTa(doc...StructuredDocumentTa(doc, aw.Markup.SdtType.DropDownList, aw.Markup.MarkupLevel...