<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=2008625">
<style>
*:last-of-type {
  columns: 474px 1;
}
*:valid {
  column-span: all;
}
*::first-letter { }
</style>
<data>
<form></form>
</data>
<u>
<fieldset></fieldset>
</u>