I thought this was a reveal.js issue, but I get the same for the standard html5 backend. What am I missing here?
[cols="1a,1.<a"]
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image::images/front-cover-thumbnail.png[Book,300,457]
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* Keep your DSL extensions beautiful
* Don't spring surprising behaviour on the user
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This renders as two rows and one columns, rather than one row and two columns.
If I remove the the .< for (vertical alignment) it renders as two columns, but has the wrong alignment.