Love using OpenIconic to put links to relevant docs in diagrams SVG diagrams, but the whole icon isn't a link; just the foreground color.
Example:
@startuml
state PLANTUML as "PlantUML" : OpenIconic [[
https://plantuml.com/creole#041a1eb0031c373d <&external-link>]] is awesome!\nBut the blue is hot - and the\nbackground is not.
@enduml
This requires me to explain to everyone I give the diagram to that they have to be very careful about where they click on those icons. Love PlantUML, and its support of OpenIconic, but fixing this would make it perfect.