This is a demonstration Mermaid diagram which implements a description tag. Does the VoiceOver screenreader find it?
graph LR;
accTitle: Big Decisions;
accDescr: This is the description for this Mermaid diagram. The diagram depicts the Bob's Burgers process for making big decisions;
A[Identify Big Descision] --> B{Make Big Decision};
B --> D[Be done];
If you are hearing this text, then you have left the diagram, and should have already heard the description contents.