<turbo-stream action="append" target="messages">
  <template>
    <div id="message_1">
      This div will be appended to the element with the DOM ID "messages".
    </div>
  </template>
</turbo-stream>

<turbo-stream action="prepend" target="messages">
  <template>
    <div id="message_1">
      This div will be prepended to the element with the DOM ID "messages".
    </div>
  </template>
</turbo-stream>

<turbo-stream action="replace" target="message_1">
  <template>
    <div id="message_1">
      This div will replace the existing element with the DOM ID "message_1".
    </div>
  </template>
</turbo-stream>

<turbo-stream action="update" target="unread_count">
  <template>
    <!-- The contents of this template will replace the
    contents of the element with ID "unread_count" by
    setting innerHtml to "" and then switching in the
    template contents. Any handlers bound to the element
    "unread_count" would be retained. This is to be
    contrasted with the "replace" action above, where
    that action would necessitate the rebuilding of
    handlers. -->
    1
  </template>
</turbo-stream>

<turbo-stream action="remove" target="message_1">
  <!-- The element with DOM ID "message_1" will be removed.
  The contents of this stream element are ignored. -->
</turbo-stream>

<turbo-stream action="before" target="current_step">
  <template>
    <!-- The contents of this template will be added before the
    the element with ID "current_step". -->
    <li>New item</li>
  </template>
</turbo-stream>

<turbo-stream action="after" target="current_step">
  <template>
    <!-- The contents of this template will be added after the
    the element with ID "current_step". -->
    <li>New item</li>
  </template>
</turbo-stream>

<turbo-stream action="remove" targets=".old_records">
  <!-- The element with the class "old_records" will be removed.
  The contents of this stream element are ignored. -->
</turbo-stream>

<turbo-stream action="after" targets="input.invalid_field">
  <template>
    <!-- The contents of this template will be added after the
    all elements that match "inputs.invalid_field". -->
    <span>Incorrect</span>
  </template>
</turbo-stream>

def destroy
  @message = Message.find(params[:id])
  @message.destroy

  respond_to do |format|
    format.turbo_stream { render turbo_stream: turbo_stream.remove(@message) }
    format.html         { redirect_to messages_url }
  end
end

<!-- app/views/messages/_message.html.erb -->
<div id="<%= dom_id message %>">
  <%= message.content %>
</div>

<!-- app/views/messages/index.html.erb -->
<h1>All the messages</h1>
<%= render partial: "messages/message", collection: @messages %># app/controllers/messages_controller.rb
class MessagesController < ApplicationController
  def index
    @messages = Message.all
  end

  def create
    message = Message.create!(params.require(:message).permit(:content))

    respond_to do |format|
      format.turbo_stream do
        render turbo_stream: turbo_stream.append(:messages, partial: "messages/message",
          locals: { message: message })
      end

      format.html { redirect_to messages_url }
    end
  end
end

Content-Type: text/vnd.turbo-stream.html; charset=utf-8

<turbo-stream action="append" target="messages">
  <template>
    <div id="message_1">
      The content of the message.
    </div>
  </template>
</turbo-stream>