css3有哪些新特性（简单介绍）

p::before{
  content: "→ ";
}

[title]{
  color: #f00;
}

.gradient {
  background: linear-gradient(to bottom, #ffffff, #000000);
}

.gradient {
  background: radial-gradient(circle at center, #ffffff, #000000);
}

.btn {
  color: black;
  transition: color 0.5s ease-out;
}
.btn:hover {
  color: white;
}

.circle {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  background-color: blue;
  animation: circle-color 5s alternate infinite;
}
@keyframes circle-color {
  0% { background-color: blue; }
  50% { background-color: yellow; }
  100% { background-color: red; }
}

.box {
  transform: translate(20px, 20px);
}

.box {
  transform: scale(2);
}

.box {
  transform: rotate(45deg);
}