<listbox sizedByContent="true">
  <!-- <listbox hflex="min"> -->

    <listhead>
      <listheader label="Title 1"/>
      <listheader label="Title 2"/>
      <listheader label="Title 3"/>
    </listhead>
    <listitem>
      <listcell label="This is a reasonably long title to see if the web browsers such as Chrome or Firefox wraps the text"/>
      <listcell label="This long:"/>
      <listcell label="This short:"/>
    </listitem>
  </listbox>