Text on a Path

<svg width="900" height="200" >
   <path id="MyPath"
          d="M 20 100 
             C 100 20 180   -60 260 20
             C 340 100 420 180 500 100
             C 580 20 660 20 660 20"
          style="fill:none; stroke:yellow"/>
  <text style="font-family:Verdana; font-size:32; fill:aqua">
    <textPath xlink:href="#MyPath">
      We go up, then we go down, then up again
    </textPath>
  </text>
</svg>