JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container d1">
<span>
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
</span>
</div>

<div class="container d2">
<span>
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation.
</span>
</div>

CSS

body {background: #ddd;}

.container {
  font-size: 18px;
  height: 40px;
  border: 1px solid silver;
  overflow: hidden;
  position: relative;
  background: white;
  margin-bottom: 1em;
}

.container:after {
  content: '...';
  position: absolute;
  bottom: 0;
  right: 0;
  padding: 0 0.3em;
  background: inherit;
}

.container span:after {
  content: '\0000a0';
  position: absolute;
  width: 1000px;
  z-index: 1;
  background: white;
}

.d1 {width: 90%;}
.d2 {width: 50%;}