I want to change the class applied on an SVG with the click of a button. The code is here .

My SVG looks like:

<svg id=test class=fill xmlns=http://www.w3.org/2000/svg width=100% height=200px >

      <path id=path22276 d=m500 81c-41-6-110-35-110-46 0-6 32 6 48 19 8 5 53 12 101 14 78 4 93 1 144-22 32-14 60-26 64-26 8 0-37 34-62 47-28 15-131 22-185 14z/>

</svg>

I tried both the below code :

  document.getElementById(test).className = halffill;

  document.querySelector(svg.fill).setAttribute(class,halffill);

I tested the same javascript code against a normal div tag. It worked fine. Is there some restriction on SVG? Please help me figure this out.