MS Word proofing annotations API #104
Description
https://learn.microsoft.com/en-us/office/dev/add-ins/word/annotations - "You can use annotations to provide feedback about grammar or other aspects of content in a Word document. The user may see colorful underlining that indicates there's an issue or other information. If the user hovers over the affected content, a popup dialog is displayed that shows them what the issue is and possible actions they can take."
HUGE CAVEAT: "The user must be running Word connected to a Microsoft 365 subscription so that your add-in can successfully run the annotation APIs."
Which sadly renders the feature useless, so this issue is more for awareness, but at least Microsoft actually finally added a proper proofing tool API. There is no way to detect whether the user has Microsoft 365. Trust Microsoft to almost do the right thing. So close, but no cigar.