<%= turbo_frame_tag dom_id(@book, :bookmark) do %>
<% if @leaf %>
<%= link_to book_slug_path(@book, anchor: dom_id(@leaf)), class: "bookmark__link" do %>
Bookmark: Resume reading <%= @book.title %>
<% end %>
<%= tag.span class: "bookmark", style: "--progress: #{ @leaf.position_as_percentage }%" do %>
<% end %>
<% else %>
<%= link_to book_slug_path(@book), class: "bookmark__link" do %>
Start reading <%= @book.title %>
<% end %>
<% end %>
<% end %>