<div class="container">
  <h1 class="reveal">
    <span class="reveal__content">
      Reveal Text and Images
    </span>
    <span class="reveal__artifact"></span>
  </h1>
  
  <br />
  
  <p class="reveal">
    <span class="reveal__content">
      using CSS animations
    </span>
    <span class="reveal__artifact"></span>
  </p>
  
  <br />
  
  <div class="reveal">
    <span class="reveal__content">
      <img src="//placehold.it/400x300" alt="Image" />
    </span>
    <span class="reveal__artifact"></span>
  </div>

</div>

body {
  min-height: 100vh;
  margin: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  font: 400 16px/1.5 sans-serif;
}

.container {
  padding: 30px;
}

h1 {
  margin-top: 0;
  margin-bottom: 10px;
  
}

p {
  margin-top: 0;
  margin-bottom: 20px;
}

.reveal {
  position: relative;
  display: inline-block;
  white-space: nowrap;

  &__artifact,
  &__content {
    animation-duration: 1s;
    animation-delay: 0.5s;
    animation-iteration-count: 1;
    animation-fill-mode: both;
  }

  &__artifact {
    position: absolute;
    top: 0;
    left: 0;
    width: 0%;
    height: 100%;
    background-color: red;

    animation-name: reveal;
  }

  &__content {
    animation-name: reveal-content;
  }
  
  // Delay sequential reveal elements (<br /> counts as a child, hence 1, 3, 5 nth-child's)
  &:nth-child(3) {
    .reveal__artifact,
    .reveal__content {
      animation-delay: 1s;
    }
  }
  &:nth-child(5) {
    .reveal__artifact,
    .reveal__content {
      animation-delay: 1.5s;
    }
  }
}

@keyframes reveal {
  0%, 100% {
    width: 0%;
    left: 0%;
  }
  50% {
    width: 100%;
    left: 0%;
  }
  100% {
    left: 100%;
  }
}

@keyframes reveal-content {
  0%,
  49.999% {
    opacity: 0;
  }
  50% {
    opacity: 1;
  }
}