ght: 1.3em;}

#two li {margin-top: 0.625em; margin-bottom: 1.5625em;}
#two li span {margin-top: 0.5em;}
#two li span b {margin-top: -0.5em; height: 2.25em;}

</style>
</head>
<body>

<section id="one">
<ul>
<li>List item #1 <span><b></b>15px</span></li>
<li>The second list item <span><b></b>15px</span></li>
<li>Item the third</li>
</ul>
</section>

<section id="two">
<ul>
<li>List item #1 <span><b></b>25px</span></li>
<li>The second list item <span><b></b>25px</span></li>
<li>Item the third</li>
</ul>
</sec