<style>
div {
  font-size: 20px;
  font-family: Monospace;
  margin: 10px;
  border: 1px solid;
  overflow: hidden;
}
span {
  color: transparent;
  letter-spacing: -2em;
}
</style>
<div><span>XX</span>PASS if this is visible</div>
<div><span>X<br>X</span>PASS if this is visible</div>
<div><span style="margin-left: -5px;">XX</span>PASS if this is partially visible</div>
<div><span style="margin-right: -5px;">XX</span>PASS if this is partially visible</div>
<div><span style="margin: -2.5px;">XX</span>PASS if this is partially visible</div>