Why doesn't code work in IE and Firefox? http://codepen.io/anon/pen/JKEvzZ
* { margin: 0; padding: 0; -webkit-box-sizing: border-box; -moz-box-sizing: border-box; box-sizing: border-box; } .over-ring { width: 160px; height: 160px; border-radius: 50%; background-color: transparent; border: 13px solid #dfe8ed; position: relative; display: inline-block; } .over-image { display: inline-block; stroke: #30bae7; stroke-width: 13px; width: 640px; height: 640px; -webkit-transform: rotate(270deg); -moz-transform: rotate(270deg); -ms-transform: rotate(270deg); -o-transform: rotate(270deg); transform: rotate(270deg); stroke-dasharray: 465; stroke-dashoffset: 49; fill: transparent; animation: circus 3.7s ease; position: absolute; top: -423px; left: -83px; } #bar { r: 73.5; cx: 150; cy: 150; } @keyframes circus { 0% { stroke-dashoffset: 465 } 100% { stroke-dashoffset: 49 } } <div class="circle-diagramma"> <div class="over-ring"> <svg id="svg" class="over-image"> <circle id="bar"></circle> </svg> </div> </div>