2 files changed, 20 insertions, 0 deletions
diff --git a/doc-tool/src/dotty/tools/dottydoc/staticsite/MarkdownCodeBlockVisitor.scala b/doc-tool/src/dotty/tools/dottydoc/staticsite/MarkdownCodeBlockVisitor.scala
new file mode 100644
index 000000000..5aeffd0d5
--- /dev/null
+++ b/doc-tool/src/dotty/tools/dottydoc/staticsite/MarkdownCodeBlockVisitor.scala
@@ -0,0 +1,19 @@
+package dotty.tools
+package dottydoc
+package staticsite
+
+import com.vladsch.flexmark.ast._
+import com.vladsch.flexmark.util.sequence.CharSubSequence
+
+object MarkdownCodeBlockVisitor {
+  def apply(node: Node): Unit =
+    new NodeVisitor(
+      new VisitHandler(classOf[FencedCodeBlock], new Visitor[FencedCodeBlock] {
+        override def visit(node: FencedCodeBlock): Unit = {
+          if (node.getOpeningMarker.length == 3)
+            node.setOpeningMarker(CharSubSequence.of("```scala"))
+        }
+      })
+    )
+    .visit(node)
+}
diff --git a/doc-tool/src/dotty/tools/dottydoc/staticsite/Page.scala b/doc-tool/src/dotty/tools/dottydoc/staticsite/Page.scala
index b637caf38..f250cbb01 100644
--- a/doc-tool/src/dotty/tools/dottydoc/staticsite/Page.scala
+++ b/doc-tool/src/dotty/tools/dottydoc/staticsite/Page.scala
@@ -126,6 +126,7 @@ class MarkdownPage(fileContents: => String, val params: Map[String, AnyRef], val
     val md = Parser.builder(Site.markdownOptions).build.parse(_html)
     // fix markdown linking
     MarkdownLinkVisitor(md, docs, params)
+    MarkdownCodeBlockVisitor(md)
     _html = HtmlRenderer
       .builder(Site.markdownOptions)
       .escapeHtml(false)