syntax.adoc in asciidoctor-2.0.0

- old
+ new

@@ -129,11 +129,11 @@
 * [ ] not checked
 
 === Callout
 
 // enable callout bubbles by adding `:icons: font` to the document header
-[source,ruby]
+[,ruby]
 ----
 puts 'Hello, World!' # <1>
 ----
 <1> Prints `Hello, World!` to the console.
 
@@ -186,10 +186,16 @@
 
 ====
 example - a demonstration of the concept being documented
 ====
 
+.Toggle Me
+[%collapsible]
+====
+collapsible - these details are revealed by clicking the title
+====
+
 ****
 sidebar - auxiliary content that can be read independently of the main content
 ****
 
 ....
@@ -198,10 +204,10 @@
 
 ----
 listing - an exhibit that features program input, source code, or the contents of a file
 ----
 
-[source,language]
+[,language]
 ----
 source - a listing that is embellished with (colorized) syntax highlighting
 ----
 
 ```language