Code doesnt work!

Question

i changed the tutorial from <rect> to <circle> and it didnt work!
..
<svg width="1000" height="250">
<circle cx="200" cy="200" r="50" fill="orange">
<animate attributeName="x" from="0" to="300"
dur="1s" fill="freeze" repeatCount="2"/>
</circle>
</svg>

Answer 1

The attributeName should be 'cx'.

Answer 2

attributeName="cx"