Haml keys can be plain strings.

    #main_page{"data-role" => 'page'}

`data-` attributes are also special-cased:

    #main_page{data: {role: 'page'}}

I did not know that. Thanks for the heads up, and thanks for Haml and Sass!

You can also use "HTML-style attributes" [1]

    #main_page(data-role='page')

[1] http://haml-lang.com/docs/yardoc/file.HAML_REFERENCE.html#ht...