What could a "spoiler tag" extension look like?

@mofosyne wrote:

Agreed. This discussion about <div> block syntax sounds related to Content Block/Inline Syntax

I haven't seen any objection for fenced ::: as the <div> block syntax. And I think it's also a good candidate for fencing generic detectives that can fall back as normal content.

Since github does (where 'ruby' is a css class name I think):

```ruby
require 'redcarpet'
markdown = Redcarpet.new("Hello World!")
puts markdown.to_html
```

then a direct eqv using the spoiler example for div would be:

:::spoiler
spoiler content here
:::

to which we can prettify it like so (perhaps classnames should have no spacing):

:::::::spoiler::::::::
spoiler content here
::::::::::::::::::::::

What do you think about this approach @vitaly ?

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