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chromium/third_party/blink/web_tests/external/wpt/css/css-typed-om/the-stylepropertymap/properties/transform-interpolated.html 

<!doctype html>
<meta charset="utf-8">
<title>'transform' property with an interpolated value</title>
<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#dom-stylepropertymap-get">
<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#dom-stylepropertymap-set">
<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#property-stle-value-normalization">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="../../resources/testhelper.js"></script>
<body>
<div id="log"></div>
<script>
'use strict';

// TODO: Try to support this sort of test with testsuite.js
test(t => {
  let elem = createDivWithStyle(t);
  elem.animate({
    transform: ['translate(1px, 1%)', 'rotate(45deg)']
  }, {
    fill: 'forwards',
    iterationStart: 0.5,
  });

  // TODO: The computed value in this case is not fully spec'd
  // See https://github.com/w3c/css-houdini-drafts/issues/425
  const result = elem.computedStyleMap().get('transform');
  assert_not_equals(result, null);
}, 'Computed value for interpolated transforms is not null');

</script>