Removes hrefs to JavaScript URIs, including unconventional namespaces.

===

<svg xmlns="http://www.w3.org/2000/svg" xmlns:uwu="http://www.w3.org/1999/xlink" viewBox="0 0 100 100" version="1.1">
  <a href="javascript:(() => { alert('uwu') })();">
    <text y="20">uwu</text>
  </a>
  <a uwu:href="javascript:(() => { alert('uwu') })();">
    <text y="30">uwu</text>
  </a>
</svg>

@@@

<svg xmlns="http://www.w3.org/2000/svg" xmlns:uwu="http://www.w3.org/1999/xlink" viewBox="0 0 100 100" version="1.1">
    <text y="20">uwu</text>
    <text y="30">uwu</text>
</svg>