Missing {} for multi-arg fenced div

Author: rundel

dev-docs/feature-format-matrix/qmd-files/mermaid/document.qmd

@@ -4,7 +4,7 @@ format:
   docusaurus-md: {}
 ---
 
-::: content-visible when-format="docusaurus-md"
+::: {.content-visible when-format="docusaurus-md"}
 This works, but emits a fairly-wonky markdown and doesn't use Javascript rendering.
 :::