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chromium/third_party/blink/web_tests/external/wpt/css/css-typed-om/the-stylepropertymap/inline/clear.html 

<!doctype html>
<meta charset="utf-8">
<title>Inline StylePropertyMap.clear</title>
<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#dom-stylepropertymap-clear">
<meta name="assert" content="Test inline StylePropertyMap.clear" />
<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(t => {
  let styleMap = createInlineStyleMap(t, '');
  styleMap.clear();
  assert_array_equals([...styleMap], []);
}, 'Clearing an empty inline style is a no-op');

test(t => {
  let styleMap = createInlineStyleMap(t, '--foo: auto; width: 10px; transition-duration: 1s, 2s');

  styleMap.clear();
  assert_equals(styleMap.get('--foo'), null,
    'Custom properties should be cleared');
  assert_equals(styleMap.get('width'), null,
    'CSS properties should be cleared');
  assert_equals(styleMap.get('transition-duration'), null,
    'List-valued properties should be cleared');
  assert_array_equals([...styleMap], []);
}, 'Can clear an inline style containing properties');

test(t => {
  let [elem, styleMap] = createElementWithInlineStyleMap(t, 'width: 10px;');
  styleMap.clear();

  assert_equals(elem.style.width, '', 'Element inline style should be cleared');
}, 'Inline StylePropertyMap.clear updates the element inline style');

</script>