JSFiddle - React, Tailwind, and code Playground

by Lexogram

HTML

<div class="serif">
  <p class="without">missng</p>
  <p class="with-mark">miss<span>|</span>ng</p>
</div>
<div class="monospace">
  <p class="without">missng</p>
  <p class="with-mark">miss<span>|</span>ng</p>
</div>

CSS

div {
  position: relative;  
}
}div.serif {
  font-family: serif;
}
div.monospace {
  font-family: 'monospace';
}

p {
  top: 0;
  left: 0;
  margin: 0;
  font-size: 33vh;
  color: gray;
}
p.with-mark {
  position: absolute;
  top: 0.07em;
  color: blue;
}
span {
  position: relative;
  left: -0.1em;
  display: inline-block;
  width: 0px;
  color: red;
}