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chromium/third_party/blink/web_tests/external/wpt/css/css-logical/parsing/margin-block-inline-computed.html 

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>CSS Logical Properties and Values: getComputedStyle().marginBlockStart etc.</title>
<link rel="help" href="https://drafts.csswg.org/css-logical/#propdef-margin-block">
<link rel="help" href="https://drafts.csswg.org/cssom/#resolved-values">
<meta name="assert" content="margin-block, margin-inline resolved values have absolute length.">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/support/computed-testcommon.js"></script>
<style>
  #container {
    will-change: transform; /* containing block for #target */
    width: 200px;
  }
  #parent {
    width: 0px;
  }
  #target {
    position: absolute;
    font-size: 40px;
  }
</style>
</head>
<body>
<div id="container">
  <div id="parent">
    <div id="target"></div>
  </div>
</div>
<script>
test_computed_value("margin-block-start", "10px");
test_computed_value("margin-block-end", "10%", "20px");
test_computed_value("margin-inline-start", "30px");
test_computed_value("margin-inline-end", "1em", "40px");

test_computed_value('margin-block-start', 'calc(10% + 40px)', '60px');
test_computed_value('margin-block-end', 'calc(10px + 0.5em)', '30px');
test_computed_value('margin-inline-start', 'calc(10px + 0.5em)', '30px');
test_computed_value('margin-inline-end', 'calc(10% + 40px)', '60px');

test_computed_value("margin-block", "10px");
test_computed_value("margin-block", "10px 20px");
test_computed_value("margin-inline", "30px");
test_computed_value("margin-inline", "30px 40px");
</script>
</body>
</html>