<p style="background: #f00; height: 1px; line-height:0;"> </p> <!-- demo2 -->
<p style="background: #f00; height: 1px; line-height:0;"><br/></p> <!-- demo3 -->
<p style="background: #f00; height: 1px; font-size:0;line-height:0"> </p><!-- demo4 -->
<p style="background: #f00; height: 1px; font-size:0;line-height:0"><br/></p><!-- demo5 -->
