A Markdown and Unfurling Saavy Text Cell

SketchSystems.spec

A Markdown and Unfurling Saavy Text Cell
  Empty Cell*
    click inside -> Edit Cell
  Edit Cell
    type markdown -> Edit Cell
    type URL -> Edit Cell with unfurl
  Edit Cell with unfurl
    click save -> Populated Cell
    click outside -> Populated Cell
  Populated Cell
    click inside -> Edit Cell

SketchSystems_prototype.js

function render(model){
  let current_state_name = model.active_states[0].name;
  return $("h1",
           {style: {color: "darkBlue"}},
           `The current state is: ${current_state_name}`);
}