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Unable to swap

This code works for changing the value of href, which I can confirm because the alert alternates confirmation as expected. However, the <image> is unchanging. What is the problem?

var onImg= "https://upload.wikimedia.org/wikipedia/commons/thumb/e/e8/CSIRO_ScienceImage_3881_Five_Antennas_at_Narrabri.jpg/1000px-CSIRO_ScienceImage_3881_Five_Antennas_at_Narrabri.jpg";
var offImg= "https://upload.wikimedia.org/wikipedia/commons/3/3d/1951_Unión_1-Colón_1.png";
function toggleImage() {
  if (this.href == onImg) {
    alert('turning off');
    this.href = offImg;
  } else {
    alert('turning on');
    this.href = onImg;
  }
}
<ul class="board">
  <li>
     <svg width="100%" height="100%" viewBox="0 0 2911 2521">
        <image clip-path="url(#hexagonal-mask)" height="100%" width="100%" href="https://upload.wikimedia.org/wikipedia/commons/thumb/e/e8/CSIRO_ScienceImage_3881_Five_Antennas_at_Narrabri.jpg/1000px-CSIRO_ScienceImage_3881_Five_Antennas_at_Narrabri.jpg" onclick="toggleImage()"/>
    </svg>
  </li>
</ul>
Via Active questions tagged javascript - Stack Overflow https://ift.tt/2FdjaAW
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