title: How to get style in Elm
body: <p>I'm starting with Elm and when you want to set style you can simply embed it on your component: <code>Html.Attribute.style List (String, String)</code></p>
  
  <p>But I can't find a way to <strong><em>get</em></strong> the style instead of set. What I need, actually, is the <code>line-height</code> (CSS attribute) of a specifc <code>Html msg</code>. I read a little about using a custom decoder (with <code>Json.Decode.at</code>) but I still didn't get it.</p>