【CSS】How to implement animation to display text line by line using transition | Demo page

.block {
  width: 300px;
  margin: 50px auto 0;
  line-height: 2.5;
}

.block span {
  position: relative;
  display: block;
  border-bottom: 1px dashed #000;
}

.block span:after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  right: 0;
  height: 100%;
  width: 100%;
  background-color: #fff;
}

.block span:nth-child(1):after {
  transition: height 0.6s ease 1.1s;
}

.block span:nth-child(2):after {
  transition: height 0.6s ease 1.45s;
}

.block span:nth-child(3):after {
  transition: height 0.6s ease 1.8s;
}

.block span:nth-child(4):after {
  transition: height 0.6s ease 2.15s;
}

.block span:nth-child(5):after {
  transition: height 0.6s ease 2.5s;
}

.block.active span:after {
  height: 0;
}

$(window).on('load', function(){
  $(".block").addClass("active");
});