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

<!doctype html>
<meta charset="utf-8">
<title>'z-index' property</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>
<script src="resources/testsuite.js"></script>
<body>
<div id="log"></div>
<script>
'use strict';

runPropertyTests('z-index', [
  { syntax: 'auto' },
  {
    syntax: '<number>',
    // z-index needs to be an integer
    specified: (input, result) => {
      if (input instanceof CSSUnitValue && !Number.isInteger(input.value))
        assert_style_value_equals(result, new CSSMathSum(input));
      else
        assert_style_value_equals(result, input);
    },
    computed: (input, result) => {
      const number = input.to('number');
      if (!Number.isInteger(number.value))
        assert_style_value_equals(result, new CSSUnitValue(Math.round(number.value), 'number'));
      else
        assert_style_value_equals(result, number);
    }
  }
]);

</script>