chromium/third_party/blink/web_tests/animations/interpolation/offset-interpolation.html

<!DOCTYPE html>
<meta charset="UTF-8">
<body>
<script src="resources/interpolation-test.js"></script>
<script>
// Regression test for crbug.com/994489
assertInterpolation({
  property: 'offset',
  from: 'path("M0 0H 200") 500px auto',
  to: 'path("M0 0H 300") 600px 0deg',
}, [
  {at: 3.40282e+038,  is: 'path("M0 0H 3.4e+38") 3.36e+07px 0deg'},
]);

// More tests appear in external/wpt/css/motion/animation/offset-interpolation.html
</script>
</body>