how mislay wholly progenitor component the child elements javascript?

let's say:

<div>
  pre text
  <div class="remove-just-this">
    <p>child foo</p>
    <p>child bar</p>
    nested text
  </div>
  post text
</div>

to this:

<div>
  pre text
  <p>child foo</p>
  <p>child bar</p>
  nested text
  post text
</div>

i've reckoning out controlling mootools, jquery even (raw) javascript, nonetheless couldn't thought this.