Why couldn't I animate a circle with this code?

Question

<svg width="2000" height="2000">
<circle cx="170" cy="60" r="50"fill="green" >

<animate attributeName="y" from="0" to ="300" dur="2s" repeatCount="2" fill="remove" />

</circle>
</svg>

Answer 1

Because <circle> element have no 'y' attribute to be animated ^^
You should use 'attributeName="cy"'...