input: |
  > [!Warning]

  hi
  > [!Warning]
  >
  <!-- -->
  >[!Warning]  
output: |-
  <blockquote>
    <p>
      [!Warning]
    </p>
  </blockquote>
  <p>
    hi
  </p>
  <blockquote>
    <p>
      [!Warning]
    </p>
  </blockquote>
  <!-- -->
  <blockquote>
    <p>
      [!Warning]
    </p>
  </blockquote>
