JSFiddle - React, Tailwind, and code Playground

HTML

<span class="set">1
  <span class="sub">2</span>
  <span class="sup">3</span>
</span>

CSS

.set{
  display:inline-block;
  position:relative;
  font-size:1em;
  vertical-align:middle;
}
.sub{
  position:absolute;
  font-size:0.5em;
  bottom:0;
  left:100%;
}
.sup{
  position:absolute;
  font-size:0.5em;
  top:0;
  left:100%;
}