I was evaluating Slim as a replacement for HAML in a personal project, and it doesn't appear to handle HTML5 data attributes as gracefully as HAML. I was hoping someone may have also run into this, or may have known about an option/syntax I haven't yet found in their docs.
HAML allows you to define HTML 5 data attributes simply by using nested hashes like so:
%a{data: {key1: 'val', key2: 'val'}}
resulting in
<a data-key1='val' data-key2='val'></a>
There are multiple ways in Slim
As Hash
Attributes which will be hyphenated if a Hash is given (e.g. data={a:1,b:2} will render as data-a="1" data-b="2")
Use it directly as "mu is too short" mentioned, quite intuitive.
a data-title="help" data-content="foo"
Use Ruby code. I often do this and rarely above.
= link_to 'foo', bar_path, data: {a: 'a', b: 'b'}