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diff --git a/testing/web-platform/tests/css/css-shapes/animation/shape-outside-interpolation.html b/testing/web-platform/tests/css/css-shapes/animation/shape-outside-interpolation.html
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+++ b/testing/web-platform/tests/css/css-shapes/animation/shape-outside-interpolation.html
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+<!DOCTYPE html>
+<meta charset="UTF-8">
+<title>shape-outside interpolation</title>
+<link rel="help" href="https://drafts.csswg.org/css-shapes/#shape-outside-property">
+<meta name="assert" content="shape-outside supports animation as <basic-shape> or discrete">
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/interpolation-testcommon.js"></script>
+
+<style>
+.parent {
+  shape-outside: circle(80% at 30% 10%);
+}
+.target {
+  shape-outside: circle(60% at 10% 30%);
+}
+</style>
+
+<body></body>
+
+<script>
+/* TODO: add inset test once blend() works for it */
+
+test_interpolation({
+  property: 'shape-outside',
+  from: neutralKeyframe,
+  to: 'circle(40% at 20% 20%)',
+}, [
+  {at: -0.3, expect: 'circle(66% at 7% 33%)'},
+  {at: 0, expect: 'circle(60% at 10% 30%)'},
+  {at: 0.3, expect: 'circle(54% at 13% 27%)'},
+  {at: 0.6, expect: 'circle(48% at 16% 24%)'},
+  {at: 1, expect: 'circle(40% at 20% 20%)'},
+  {at: 1.5, expect: 'circle(30% at 25% 15%)'},
+]);
+
+test_no_interpolation({
+  property: 'shape-outside',
+  from: 'initial',
+  to: 'circle(40% at 20% 20%)',
+});
+
+test_interpolation({
+  property: 'shape-outside',
+  from: 'inherit',
+  to: 'circle(40% at 20% 20%)',
+}, [
+  {at: -0.3, expect: 'circle(92% at 33% 7%)'},
+  {at: 0, expect: 'circle(80% at 30% 10%)'},
+  {at: 0.3, expect: 'circle(68% at 27% 13%)'},
+  {at: 0.6, expect: 'circle(56% at 24% 16%)'},
+  {at: 1, expect: 'circle(40% at 20% 20%)'},
+  {at: 1.5, expect: 'circle(20% at 15% 25%)'},
+]);
+
+test_no_interpolation({
+  property: 'shape-outside',
+  from: 'unset',
+  to: 'circle(40% at 20% 20%)',
+});
+
+test_interpolation({
+  property: 'shape-outside',
+  from: 'circle(100% at 0% 0%)',
+  to: 'circle(50% at 25% 25%)',
+}, [
+  {at: -0.3, expect: 'circle(115% at -7.5% -7.5%)'},
+  {at: 0, expect: 'circle(100% at 0% 0%)'},
+  {at: 0.3, expect: 'circle(85% at 7.5% 7.5%)'},
+  {at: 0.6, expect: 'circle(70% at 15% 15%)'},
+  {at: 1, expect: 'circle(50% at 25% 25%)'},
+  {at: 1.5, expect: 'circle(25% at 37.5% 37.5%)'}
+]);
+
+test_interpolation({
+  property: 'shape-outside',
+  from: 'ellipse(100% 100% at 0% 0%)',
+  to: 'ellipse(50% 50% at 25% 25%)',
+}, [
+  {at: -0.3, expect: 'ellipse(115% 115% at -7.5% -7.5%)'},
+  {at: 0, expect: 'ellipse(100% 100% at 0% 0%)'},
+  {at: 0.3, expect: 'ellipse(85% 85% at 7.5% 7.5%)'},
+  {at: 0.6, expect: 'ellipse(70% 70% at 15% 15%)'},
+  {at: 1, expect: 'ellipse(50% 50% at 25% 25%)'},
+  {at: 1.5, expect: 'ellipse(25% 25% at 37.5% 37.5%)'}
+]);
+
+test_interpolation({
+  property: 'shape-outside',
+  from: 'polygon(nonzero, 0px 0px, 25px 25px, 50px 50px)',
+  to: 'polygon(nonzero, 25px 25px, 50px 50px, 75px 75px)',
+}, [
+  {at: -0.3, expect: 'polygon(nonzero, -7.5px -7.5px, 17.5px 17.5px, 42.5px 42.5px)'},
+  {at: 0, expect: 'polygon(nonzero, 0px 0px, 25px 25px, 50px 50px)'},
+  {at: 0.3, expect: 'polygon(nonzero, 7.5px 7.5px, 32.5px 32.5px, 57.5px 57.5px)'},
+  {at: 0.6, expect: 'polygon(nonzero, 15px 15px, 40px 40px, 65px 65px)'},
+  {at: 1, expect: 'polygon(nonzero, 25px 25px, 50px 50px, 75px 75px)'},
+  {at: 1.5, expect: 'polygon(nonzero, 37.5px 37.5px, 62.5px 62.5px, 87.5px 87.5px)'}
+]);
+
+test_no_interpolation({
+  property: 'shape-outside',
+  from: 'polygon(evenodd, 0px 0px, 25px 25px, 50px 50px)',
+  to: 'polygon(nonzero, 25px 25px, 50px 50px, 75px 75px)',
+});
+
+test_interpolation({
+  property: 'shape-outside',
+  from: 'inset(100%)',
+  to: 'inset(120%)',
+}, [
+  {at: -0.3, expect: 'inset(94%)'},
+  {at: 0, expect: 'inset(100%)'},
+  {at: 0.3, expect: 'inset(106%)'},
+  {at: 0.6, expect: 'inset(112%)'},
+  {at: 1, expect: 'inset(120%)'},
+  {at: 1.5, expect: 'inset(130%)'},
+]);
+
+test_no_interpolation({
+  property: 'shape-outside',
+  from: 'none',
+  to: 'ellipse(100% 100% at 0% 0%)',
+});
+
+// TODO: add intermediate keyframe tests when CSS shapes position computed values are cleaned up
+test_interpolation({
+  property: 'shape-outside',
+  from: 'circle(25% at right 5% bottom 15px)',
+  to: 'circle(45% at right 25% bottom 35px)',
+}, [
+  {at: 0.25, expect: 'circle(30% at 90% calc(-20px + 100%))'},
+  {at: 0.5, expect: 'circle(35% at 85% calc(-25px + 100%))'},
+  {at: 0.75, expect: 'circle(40% at 80% calc(-30px + 100%))'},
+]);
+</script>