Changing SVG image color with javascript

Sure, here is an example (standard HTML boilerplate omitted):

<svg id="svg1" xmlns="http://www.w3.org/2000/svg" style="width: 3.5in; height: 1in">
  <circle id="circle1" r="30" cx="34" cy="34" 
            style="fill: red; stroke: blue; stroke-width: 2"/>
  </svg>
<button onclick="circle1.style.fill="yellow";">Click to change to yellow</button>

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