text: **Artifacts**
  
  The following types of content are marked as <Artifact> in the PDF Content Tree and 
  
  have no PDF/UA tags: 
  
  Header and footer 
  
  Decorative graphical objects 
  
  Gray space on the right side of the page for comments 
  
  Pictures in picture bullets 
  
  Underlines 
  
  Borders around text and quote paragraphs 
  
  Lines above footnotes/endnotes 
  
  Text in SmartArt objects 