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• Use layout: elk for denser, more complex graphs.
• Use width: 85vw or 90vw for large architecture diagrams.
• For animated compositions, prefer short labels and clear scenario deltas.
• If a diagram is too dense, split it into multiple diagrams and link them with headings.
• For icons, use D2's icon: "<svg-url>" support with SVG URLs.
• Good sources:
  • D2 icon tour: https://github.com/terrastruct/d2-docs/blob/master/docs/tour/icons.md
  • Terrastruct icon catalog (official D2 examples): https://icons.terrastruct.com/
  • Iconify API (large icon library used in examples above): https://api.iconify.design/