How to make css text animation like this?

Question

css

How to make such (text Welcome!) animation in pure css?

Answer 1

h1 {
  position: relative;
  width: fit-content;
  padding:  0 10px;
}

h1::before {
  content: "";
  position: absolute;
  display: block;
  height: 100%;
  background: #fff;
  animation: foo 3s;
}

@keyframes foo {
  0% {
    left: 0;
    right: 100%;
  }

  50% {
    left: 0;
    right: 0;
  }

  100% {
    left: 0;
    right: 100%;
  }
}