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chromium/third_party/blink/web_tests/external/wpt/css/css-scroll-snap/parsing/scroll-margin-shorthand.html 

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>CSS Scroll Snap Test: scroll-margin sets longhands</title>
<link rel="help" href="https://drafts.csswg.org/css-scroll-snap-1/#propdef-scroll-margin">
<meta name="assert" content="scroll-margin supports the full grammar '<length>{1,4}'.">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/support/shorthand-testcommon.js"></script>
</head>
<body>
<script>
test_shorthand_value('scroll-margin', '10px', {
  'scroll-margin-top': '10px',
  'scroll-margin-right': '10px',
  'scroll-margin-bottom': '10px',
  'scroll-margin-left': '10px'
});

test_shorthand_value('scroll-margin', '30px 20px', {
  'scroll-margin-top': '30px',
  'scroll-margin-right': '20px',
  'scroll-margin-bottom': '30px',
  'scroll-margin-left': '20px'
});

test_shorthand_value('scroll-margin', '1px 2px 3px', {
  'scroll-margin-top': '1px',
  'scroll-margin-right': '2px',
  'scroll-margin-bottom': '3px',
  'scroll-margin-left': '2px'
});

test_shorthand_value('scroll-margin', '-1px 2px 3px 0', {
  'scroll-margin-top': '-1px',
  'scroll-margin-right': '2px',
  'scroll-margin-bottom': '3px',
  'scroll-margin-left': '0px'
});
</script>
</body>
</html>