<g class="my-group">
    <circle r="40" cx="10" cy="10"></circle>
</g>
rectangecircle
<g class="my-group">
    <rect x="-16" y="-30" width="60" height="60" fill="red" transform="rotate(45)" rx="4"></rect>
</g>
coordinateswidthheight
widthheight80px