1-1 什么是CSS3？

body{ background:#000; } h1 { text-align:center; color:#fff; font-size:48px; font-family: 'Fruktur', cursive; text-shadow: 1px 1px 1px #ccc, 0 0 10px #fff, 0 0 20px #fff, 0 0 30px #fff, 0 0 40px #ff00de, 0 0 70px #ff00de, 0 0 80px #ff00de, 0 0 100px #ff00de, 0 0 150px #ff00de; transform-style: preserve-3d; -moz-transform-style: preserve-3d; -webkit-transform-style: preserve-3d; -ms-transform-style: preserve-3d; -o-transform-style: preserve-3d; animation: run ease-in-out 9s infinite; -moz-animation: run ease-in-out 9s infinite ; -webkit-animation: run ease-in-out 9s infinite; -ms-animation: run ease-in-out 9s infinite; -o-animation: run ease-in-out 9s infinite; } @keyframes run { 0% { transform:rotateX(-5deg) rotateY(0); } 50% { transform:rotateX(0) rotateY(180deg); text-shadow: 1px 1px 1px #ccc, 0 0 10px #fff, 0 0 20px #fff, 0 0 30px #fff, 0 0 40px #3EFF3E, 0 0 70px #3EFFff, 0 0 80px #3EFFff, 0 0 100px #3EFFee, 0 0 150px #3EFFee; } 100% { transform:rotateX(5deg) rotateY(360deg); } } @-moz-keyframes run { 0% { -moz-transform:rotateX(-5deg) rotateY(0); } 50% { -moz-transform:rotateX(0) rotateY(180deg); text-shadow: 1px 1px 1px #ccc, 0 0 10px #fff, 0 0 20px #fff, 0 0 30px #fff, 0 0 40px #3EFF3E, 0 0 70px #3EFFff, 0 0 80px #3EFFff, 0 0 100px #3EFFee, 0 0 150px #3EFFee; } 100% { -moz-transform:rotateX(5deg) rotateY(360deg); } } @-webkit-keyframes run { 0% { -webkit-transform:rotateX(-5deg) rotateY(0); } 50% { -webkit-transform:rotateX(0) rotateY(180deg); text-shadow: 1px 1px 1px #ccc, 0 0 10px #fff, 0 0 20px #fff, 0 0 30px #fff, 0 0 40px #3EFF3E, 0 0 70px #3EFFff, 0 0 80px #3EFFff, 0 0 100px #3EFFee, 0 0 150px #3EFFee; } 100% { -webkit-transform:rotateX(5deg) rotateY(360deg); } } @-ms-keyframes run { 0% { -ms-transform:rotateX(-5deg) rotateY(0); } 50% { -ms-transform:rotateX(0) rotateY(180deg); } 100% { -ms-transform:rotateX(5deg) rotateY(360deg); } } </style>