line-height causes clipping of text?

[W P Blatchley]

I'm not sure if this is a Netsurf bug or not, but the following fragment  
produces text that's clipped along the top:

    <div style="line-height:80%;">
      <h1>Heading - cropped</h1>
      Normal text
    </div>
Other browsers I've tried (Opera, IE on Windows) don't exhibit the same  
behaviour, though I know that's no guarantee that Netsurf's doing  
something wrong.

Can anyone confirm if this is a bug or not?

Thanks,

WPB