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

<!doctype html>
<meta charset="utf-8">
<title>'background-size' 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';

runListValuedPropertyTests('background-size', [
  {
    syntax: '<length>',
    specified: assert_is_equal_with_range_handling
  },
  {
    syntax: '<percentage>',
    specified: assert_is_equal_with_range_handling
  },
  { syntax: 'auto' },
  { syntax: 'cover' },
  { syntax: 'contain' },
]);

runUnsupportedPropertyTests('background-size', [
  '200px 100px'
]);

</script>