Pattern

    <.toggle_group
  class="toggle-group"
  value={@value}
  multiple
  controlled
  on_value_change="toggle_group_pattern"
>
  <:item value="lorem">Lorem</:item>
  <:item value="duis">Duis</:item>
  <:item value="donec">Donec</:item>
</.toggle_group>

  

    def mount(_params, _session, socket) do
  {:ok, assign(socket, :value, ["lorem"])}
end

def handle_event("toggle_group_pattern", %{"value" => v}, socket) do
  {:noreply, assign(socket, :value, v || [])}
end