How to use the viewer:

• Click edition buttons to open windows (click again to close)
• Compare multiple editions side-by-side
• Zoom and navigate using mouse/trackpad or controls in each window
• Rearrange windows by dragging them to different positions
• Toggle fullscreen using the fullscreen button in each window
• Deep links: Share direct links to editions using URL parameters:
  • ?edition=1788 - load a single edition
  • ?edition=1788;1793 - load multiple editions (separate with semicolons)
  • ?edition=1794-spurious - load variant editions (use year-variant format)
  • ?edition=1766;1766-kittys - combine regular and variant editions