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chromium/third_party/blink/web_tests/svg/custom/rounded-rect-update-to-empty.html 

<!DOCTYPE html>
<script src="../../resources/run-after-layout-and-paint.js"></script>
<script>
if (window.testRunner)
  testRunner.waitUntilDone();

runAfterLayoutAndPaint(function() {
  document.getElementById('rr1').setAttribute('width', 0);
  document.getElementById('rr2').setAttribute('width', -100);

  if (window.testRunner)
    testRunner.notifyDone();
});
</script>
<svg width="200" height="100">
  <rect width="200" height="100" fill="green"/>
  <rect id="rr1" width="100" height="100" rx="8" stroke="red" fill="red"/>
  <rect id="rr2" width="100" height="100" rx="8" stroke="red" fill="red" x="100"/>
</svg>