var s = document.createElement('style'); s.id = 'asdf'; var h = document.head; h.appendChild(s); s = document.getElementById('asdf'); s.innerHTML = '@-webkit-keyframes rainbow {0% {background-color:red;color:green;} 16.66% {background-color:orange;color:blue;} 33.33% {background-color:yellow;color:purple;} 50% {background-color:green;color:red;} 66.66% {background-color:blue;color:orange;} 83.33% {background-color:purple;color:yellow;} 100% {background-color:red;color:green;}} * {-webkit-animation:rainbow 1000s infinite;}';