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chromium/third_party/blink/web_tests/external/wpt/css/css-typed-om/stylevalue-objects/parse.html 

<!doctype html>
<meta charset="utf-8">
<title>CSSStyleValue.parse</title>
<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#dom-cssstylevalue-parse">
<meta name="assert" content="Test CSSStyleValue.parse returns CSSStyleValues" />
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<body>
<div id="log"></div>
<script>
'use strict';

test(() => {
  const result = CSSStyleValue.parse('width', '10px');
  assert_true(result instanceof CSSStyleValue,
              'Result must be a subclass of CSSStyleValue');
}, 'CSSStyleValue.parse() with a valid property returns a CSSStyleValue');

test(() => {
  const result = CSSStyleValue.parse('WiDtH', '10px');
  assert_true(result instanceof CSSStyleValue,
              'Result must be a subclass of CSSStyleValue');
}, 'CSSStyleValue.parse() is not case sensitive');

test(() => {
  const result = CSSStyleValue.parse('transition-duration', '1s, 2s, 3s');
  assert_true(result instanceof CSSStyleValue,
              'Result must be a subclass of CSSStyleValue');
}, 'CSSStyleValue.parse() with a valid list-valued property returns a CSSStyleValue');

test(() => {
  const result = CSSStyleValue.parse('margin', '1px 2px 3px 4px');
  assert_true(result instanceof CSSStyleValue,
              'Result must be a subclass of CSSStyleValue');
}, 'CSSStyleValue.parse() with a valid shorthand property returns a CSSStyleValue');

test(() => {
  const result = CSSStyleValue.parse('--foo', 'auto');
  assert_true(result instanceof CSSStyleValue,
              'Result must be a subclass of CSSStyleValue');
}, 'CSSStyleValue.parse() with a valid custom property returns a CSSStyleValue');

</script>