Currently producing a number of UML Sequence diagrams for a project using the superb https://www.websequencediagrams.com/ site.
To save for posterity, I wanted to add the diagrams to the clients internal Confluence server.
WebSequenceDiagrams provide a plugin for Confluence V4+
However, not all is lost, simply create your own Macro.
From within Confluence (based on 3.5.1):
HTML to paste in:
Then within your Confluence page, just add:
Which should give you:
All good