text: Microsoft 365 Apps for Windows including Word, Excel, and PowerPoint allow users to 
  
  export documents in PDF format. Furthermore, add-ins can use the object model to 
  
  automate PDF export using either the exporter built in to each app or their own exporter 
  
  that implements the IMsoDocExporter COM interface. 
  
  An important part of exporting to PDF is writing PDF/UA tags that provide the 
  
  semantic information to preserve the accessibility of the content. This allows people with 
  
  disabilities to consume the PDF using assistive technologies such as screen readers. This 
  
  documentation provides details about the PDF/UA tags written by the exporter built in 
  
  to Word, Excel, and PowerPoint as well as the APIs that add-ins need to implement to 
  
  provide their own exporter. 