Revision control
++ <svg viewBox="0 0 300 500" xmlns="http://www.w3.org/2000/svg">
++ <style>
++ #circle1, #circle3 {
++ fill: gold;
++ stroke: black;
++ stroke-width: 25;
++ }
++ </style>
++ <circle id="circle1" cx="150" cy="100" r="50" fill="red" stroke="blue"/>
++ <circle id="circle2" cx="150" cy="250" r="50" style="fill: cyan; stroke: orange; stroke-width: 25"/>
++ <circle id="circle3" cx="150" cy="400" r="50" fill="white" stroke="white" stroke-width="6" style="fill: cyan; stroke: orange; stroke-width: 25"/>
++ </svg>