Not sure what you mean about text rendering not relying on a specific tool. The main principle of Markdown is that it should be viewable and editable in plain text and should be understandable when viewed in plain text, which Mermaid diagrams certainly are.
A Markdown viewer transforms the plain text into a prettier format, just as your web browser transforms HTML into pretty web pages. If you were to view a document containing a Mermaid diagram in a Markdown viewer that doesn’t support Mermaid, you’d see the plain text version of the diagram, which though not ideal, would still be understandable.
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