Officejs
Office.js is the JavaScript API used by Office Add-ins to extend Microsoft Office applications. It enables developers to write cross-platform web-based code that runs inside Word, Excel, PowerPoint, and Outlook, providing access to documents, mail items, and the user interface. Add-ins are delivered with a manifest and can appear as task panes, content add-ins, or mailbox apps.
The API is exposed through the Office.js library, loaded by the add-in and accessed via the global
The API surface uses requirement sets to denote capabilities across hosts, enabling use of newer features while
Deployment and compatibility: Office Add-ins built with Office.js run in Office on Windows and macOS, Office