{
  "boolean attributes" : {

    "boolean attribute with XHTML" : {
      "haml" : "%input(checked=false)",
      "html" : "<input />",
      "config" : {
        "format" : "xhtml"
      }
    },

    "boolean attribute with HTML" : {
      "haml" : "%input(checked=false)",
      "html" : "<input>",
      "config" : {
        "format" : "html5"
      }
    }
  }

}

{
  "data attributes" : {

    "boolean attribute with XHTML" : {
      "haml" : "%a{:href=>\"/posts\", :data => {:author_id => 123}} Posts By Author",
      "html" : "<a data-author_id='123' href='/posts'>Posts By Author</a>",
      "config" : {
        "format" : "html5"
      }
    }
  },

  "boolean attributes" : {

    "boolean attribute with XHTML" : {
      "haml" : "%input(checked=false)",
      "html" : "<input />",
      "config" : {
        "format" : "xhtml"
      }
    },

    "boolean attribute with HTML" : {
      "haml" : "%input(checked=false)",
      "html" : "<input>",
      "config" : {
        "format" : "html5"
      }
    }
  }

}

Add a data attribute spec.
Add a data attribute spec.
