<html>
<head>
<style>
.sup {vertical-align: super;}
.transparent {color: transparent;}
.alllines {text-decoration:line-through overline underline; color: purple;}
.highRel {position: relative; top: -4em;}
.lowRel {position: relative; top: 4em;}
.lowVert {vertical-align: -4em;}
.highVert {vertical-align: 4em;}
</style>
</head>
<body>
<p>
<span style="text-decoration: underline">Underlined <span class="sup transparent">still underlined</span></span>
<span style="text-decoration: underline">Underlined <span class="sup"> </span></span>
</p>
<p>
<span class="alllines">
Before<span class="highVert transparent">high</span><span class="lowVert transparent">low</span>After
</span>
</p>
<p>
<span class="alllines">
Before<span class="highRel">high</span><span class="lowRel">low</span>After</span>
</span>
</p>
</body>
</html>