If making different modifications to two different nodes in the same parent,
drop attributes and collapse nodes appropriately without losing elements.

===

<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" version="1.1">
  <script>alert('uwu')</script>
  <g onclick="alert('uwu')">
    <text y="10">uwu</text>
  </g>
  <a href="javascript:(() => { alert('uwu') })();">
    <text y="20">uwu</text>
  </a>
</svg>

@@@

<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" version="1.1">
    <g>
        <text y="10">uwu</text>
    </g>
    <text y="20">uwu</text>
</svg>