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diff --git a/testing/web-platform/tests/css/css-flexbox/animation/flex-shrink-interpolation.html b/testing/web-platform/tests/css/css-flexbox/animation/flex-shrink-interpolation.html
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index 0000000000..da69a06891
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+++ b/testing/web-platform/tests/css/css-flexbox/animation/flex-shrink-interpolation.html
@@ -0,0 +1,102 @@
+<!DOCTYPE html>
+<meta charset="UTF-8">
+<title>flex-shrink interpolation</title>
+<link rel="help" href="https://drafts.csswg.org/css-flexbox-1/#flex-shrink-property">
+<meta name="assert" content="flex-shrink supports animation as a number">
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/interpolation-testcommon.js"></script>
+
+<style>
+.parent {
+  flex-shrink: 3;
+}
+.target {
+  flex-shrink: 1.5;
+}
+</style>
+
+<body></body>
+
+<script>
+test_interpolation({
+  property: 'flex-shrink',
+  from: neutralKeyframe,
+  to: '2',
+}, [
+  {at: -0.3, expect: '1.35'},
+  {at: 0, expect: '1.5'},
+  {at: 0.3, expect: '1.65'},
+  {at: 0.6, expect: '1.8'},
+  {at: 1, expect: '2'},
+  {at: 1.5, expect: '2.25'},
+]);
+
+test_interpolation({
+  property: 'flex-shrink',
+  from: 'initial',
+  to: '2',
+}, [
+  {at: -0.3, expect: '0.7'},
+  {at: 0, expect: '1'},
+  {at: 0.3, expect: '1.3'},
+  {at: 0.6, expect: '1.6'},
+  {at: 1, expect: '2'},
+  {at: 1.5, expect: '2.5'},
+]);
+
+test_interpolation({
+  property: 'flex-shrink',
+  from: 'inherit',
+  to: '2',
+}, [
+  {at: -0.3, expect: '3.3'},
+  {at: 0, expect: '3'},
+  {at: 0.3, expect: '2.7'},
+  {at: 0.6, expect: '2.4'},
+  {at: 1, expect: '2'},
+  {at: 1.5, expect: '1.5'},
+]);
+
+test_interpolation({
+  property: 'flex-shrink',
+  from: 'unset',
+  to: '2',
+}, [
+  {at: -0.3, expect: '0.7'},
+  {at: 0, expect: '1'},
+  {at: 0.3, expect: '1.3'},
+  {at: 0.6, expect: '1.6'},
+  {at: 1, expect: '2'},
+  {at: 1.5, expect: '2.5'},
+]);
+
+test_interpolation({
+  property: 'flex-shrink',
+  from: '1',
+  to: '2',
+}, [
+  {at: -5, expect: '0'},
+  {at: -0.3, expect: '0.7'},
+  {at: 0, expect: '1'},
+  {at: 0.3, expect: '1.3'},
+  {at: 0.6, expect: '1.6'},
+  {at: 1, expect: '2'},
+  {at: 1.5, expect: '2.5'},
+]);
+
+test_interpolation({
+  property: 'flex-shrink',
+  from: '0',
+  to: '1',
+}, [
+  {at: -5, expect: '0'},
+  {at: -0.3, expect: '0'},
+  {at: 0, expect: '0'},
+  {at: 0.3, expect: '0.3'},
+  {at: 0.6, expect: '0.6'},
+  {at: 1, expect: '1'},
+  {at: 1.5, expect: '1.5'},
+]);
+</script>