bb
<style type="text/css">
#d_adjust {
font-family:verdana,times;
font-size:20px;
}
#d_adjust span {
border:solid 1px red;
}
#d_adjust .adjust {
font-size-adjust:0.5;
}
</style>
<p id="d_adjust"><span>b</span><span class="adjust">b</span></p>