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+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>ray() angle interpolation with css math functions</title>
+    <link rel="author" title="Daniil Sakhapov" href="mailto:sakhapov@chromium.org">
+    <link rel="help" href="https://drafts.fxtf.org/motion/#offset-path-property">
+    <link rel="help" href="https://drafts.csswg.org/css-values/#sign-funcs">
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/css/support/interpolation-testcommon.js"></script>
+  </head>
+  <style>
+    :root {
+      font-size: 10px;
+    }
+  </style>
+  <body>
+    <script>
+      test_interpolation({
+        property: 'offset-path',
+        from: 'ray(100deg)',
+        to: 'ray(calc(sign(20rem - 20px) * 180deg))',
+      }, [
+        {at: -1, expect: 'ray(20deg)'},
+        {at: 0, expect: 'ray(100deg)'},
+        {at: 0.125, expect: 'ray(110deg)'},
+        {at: 0.875, expect: 'ray(170deg)'},
+        {at: 1, expect: 'ray(180deg)'},
+        {at: 2, expect: 'ray(260deg)'}
+      ]);
+
+      test_interpolation({
+        property: 'offset-path',
+        from: 'ray(calc(sign(20rem - 20px) * 100deg))',
+        to: 'ray(calc(sign(20rem - 20px) * 180deg))',
+      }, [
+        {at: -1, expect: 'ray(20deg)'},
+        {at: 0, expect: 'ray(100deg)'},
+        {at: 0.125, expect: 'ray(110deg)'},
+        {at: 0.875, expect: 'ray(170deg)'},
+        {at: 1, expect: 'ray(180deg)'},
+        {at: 2, expect: 'ray(260deg)'}
+      ]);
+    </script>
+  </body>
+</html>