On Tue, May 24, 2016 at 9:06 AM, Ted [via Asciidoctor :: Discussion] <[hidden email]> wrote:
The triple-plus looks like it is only for inline
The markup +++<u>underline me</u>+++ renders as underlined text.
Technically, you can use either the inline passthrough (+++) or the block passthrough (++++). However, the inline passthrough assumes the content is inside a paragraph, so you'll get paragraph tags around the content. The block version passes through the content without wrapping it.
I have a feeling the blank output is a secondary issue, depending on where you're viewing it. For example, if you're trying to do this on GitHub, it isn't going to work. GitHub does not allow passing through arbitrary HTML unless it is on the white list (which isn't much).
In general, when you use a passthrough like this, your immediate thought should be to introduce an extension. In the case of the image gallery, it is much better to write:
Then implement a block macro extension for "imgur". Now, your document is semantic and not coupled to the output format.