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chromium/third_party/blink/web_tests/external/wpt/css/css-typed-om/the-stylepropertymap/declared/delete.html 

<!doctype html>
<meta charset="utf-8">
<title>Declared StylePropertyMap.delete</title>
<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#delete-a-stylepropertymap">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="../../resources/testhelper.js"></script>
<body>
<div id="log">
<script>
'use strict';

test(t => {
  let [rule, styleMap] = createRuleWithDeclaredStyleMap(t, '');
  assert_equals(rule.style.getPropertyValue('width'), '');

  styleMap.delete('width');
  assert_equals(rule.style.getPropertyValue('width'), '');
}, 'Deleting a property not in the css rule is a no-op');

test(t => {
  let [rule, styleMap] = createRuleWithDeclaredStyleMap(t, 'width: 10px');
  assert_not_equals(rule.style.getPropertyValue('width'), '');

  styleMap.delete('width');
  assert_equals(rule.style.getPropertyValue('width'), '');
}, 'Deleting a property in the css rule removes it from the css rule');

test(t => {
  let [rule, styleMap] = createRuleWithDeclaredStyleMap(t, '--Foo: 10px');
  assert_not_equals(rule.style.getPropertyValue('--Foo'), '');

  styleMap.delete('--Foo');
  assert_equals(rule.style.getPropertyValue('--Foo'), '');
}, 'Deleting a custom property in the css rule removes it from the ' +
   'css rule');

test(t => {
  let [rule, styleMap] = createRuleWithDeclaredStyleMap(t,
      'transition-duration: 1s, 2s');
  assert_not_equals(rule.style.getPropertyValue('transition-duration'), '');

  styleMap.delete('transition-duration');
  assert_equals(rule.style.getPropertyValue('transition-duration'), '');
}, 'Deleting a list-valued property in the css rule removes it from ' +
   'the css rule');

test(t => {
  let [rule, styleMap] = createRuleWithDeclaredStyleMap(t, 'width: 10px');
  assert_not_equals(rule.style.getPropertyValue('width'), '');

  styleMap.delete('wIdTh');
  assert_equals(rule.style.getPropertyValue('width'), '');
}, 'Declared StylePropertyMap.delete is not case-sensitive');

</script>