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chromium/third_party/blink/web_tests/external/wpt/css/css-typed-om/stylevalue-subclasses/numeric-objects/cssUnitValue.html 

<!doctype html>
<meta charset="utf-8">
<title>CSSUnitValue Constructor</title>
<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#dom-cssunitvalue-cssunitvalue">
<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';

test(() => {
  assert_throws_js(TypeError, () => new CSSUnitValue(0, 'lemon'));
}, 'Constructing CSSUnitValue with an unknown unit throws a TypeError');

test(() => {
  assert_throws_js(TypeError, () => new CSSUnitValue(0, ''));
}, 'Constructing CSSUnitValue with a empty string unit throws a TypeError');

for (const unit of gValidUnits) {
  test(() => {
    const result = new CSSUnitValue(-3.14, unit);
    assert_not_equals(result, null, 'a CSSUnitValue is created');
    assert_equals(result.value, -3.14,
                  'value is same as given by constructor');
    assert_equals(result.unit, unit.toLowerCase(),
                  'unit is same as given by constructor');
  }, 'CSSUnitValue can be constructed with ' + unit);
}

</script>