JSFiddle - React, Tailwind, and code Playground

by CBroe

HTML

<h1 data-text="Incoming Call" data-placeholder="........ ...." style="--text-length: 13;" data-text-length="13">Incoming Call</h1>

CSS

* { margin: 0; padding:0; box-sizing: border-box; }
html, body {
  display: flex;
  min-height: 100vh;
  justify-content: center;
  align-items: center;
  color: #fff;
  background: #111;
}
h1 {
  position: relative;
  font-family: monospace;
  color: transparent;
  border: .125em solid #fff;
  border-radius: .25em;
  padding: .125em .75em;
}
h1::before, h1::after {
  position: absolute;
  color: #fff;
  top: .125em;
  left: .75em;
}
h1::before {
  content: attr(data-text);
  clip-path: inset(0% 100% 0% 0%);
  animation: .75s steps(14, jump-none) .75s forwards reveal;
}
h1::after {
  content: attr(data-placeholder);
  text-align: right;
  clip-path: inset(0% 100% 0% 0%);
  animation: .75s steps(14, jump-none) 0s forwards reveal, .75s steps(14, jump-none) .75s forwards repeal;
}
@keyframes reveal {
  from {
    /* top, right, bottom and left offsets */
    clip-path: inset(0% 100% 0% 0%);
  }
  to {
    clip-path: inset(0% 0% 0% 0%);
  }
}
@keyframes repeal {
  from {
    /* top, right, bottom and left offsets */
    clip-path: inset(0% 0% 0% 0%);
  }
  to {
    clip-path: inset(0% 0% 0% 100%);
  }
}