Graphs with Mermaid

Syntax

{{#mermaid:graph TD;
 A-->B;
 A-->C;
 B-->D;
 C-->D;
 click A "https://sandbox.semantic-mediawiki.org/wiki/A"
 click B "https://sandbox.semantic-mediawiki.org/wiki/B"
 click C "https://sandbox.semantic-mediawiki.org/wiki/C"
 click D "https://sandbox.semantic-mediawiki.org/wiki/D"
}}