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chromium/third_party/blink/web_tests/animations/responsive/interpolation/svg-points-responsive.html 

<!DOCTYPE html>
<script src="resources/responsive-test.js"></script>
<script>
assertSVGResponsive({
  targetTag: 'polygon',
  property: 'points',
  getter(target) {
    return Array.from(target.animatedPoints).map(p => `${p.x} ${p.y}`).join(', ');
  },
  from: neutralKeyframe,
  to: '10 20, 30 40',
  configurations: [{
    state: {underlying: '10 10, 20 20'},
    expect: [
      {at: 0.25, is: '10 12.5, 22.5 25'},
      {at: 0.75, is: '10 17.5, 27.5 35'},
    ],
  }, {
    state: {underlying: '10 10'},
    expect: [
      {at: 0.25, is: '10 10'},
      {at: 0.75, is: '10 20, 30 40'},
    ],
  }],
});
</script>