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chromium/third_party/blink/web_tests/external/wpt/css/css-properties-values-api/animation/custom-property-transition-transform-function-box-size.tentative.html 

<!DOCTYPE html>
<link rel="help" href="https://drafts.css-houdini.org/css-properties-values-api-1">
<link rel="help" href="https://drafts.csswg.org/css-values-4/#interpolate">
<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/2854">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="../resources/utils.js"></script>
<div id="target"></div>
<script>

transition_test({
  syntax: "<transform-function>",
  from: "translateX(50%)",
  to: "scale(4)",
  expected: "mix(50%; translateX(50%); scale(4))",
  behavior: 'allow-discrete',
}, 'A custom property of type <transform-function> yields a CSS Transition using the mix function for a box size dependent matrix interpolation');

</script>