From https://once.com/writebook

app/views/leaves/_being_edited_by.turbo_stream.erb

@@ -0,0 +1,9 @@
+<%= turbo_stream.append dom_id(leaf, :being_edited) do %>
+  <%= tag.div id: dom_id(user, :being_edited_by),
+        class: "flex-inline align-center justify-center margin-block-end-double txt-medium gap being-edited-by",
+        data: { controller: "autoremove", action: "animationend->autoremove#remove", hide_from_user_id: user.id } do %>
+    <strong class="margin-inline-end-half"><%= user.name %></strong>
+    <span class="spinner txt-small flex-inline"></span>
+    <%= image_tag "write.svg", aria: { hidden: true }, size: 18, class: "colorize--white margin-inline-start" %>
+  <% end %>
+<% end %>