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

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>CSS Scroll Snap: getComputedStyle().scrollMargin</title>
<link rel="help" href="https://drafts.csswg.org/css-scroll-snap-1/#propdef-scroll-margin">
<meta name="assert" content="scroll-margin computed value is absolute length.">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/support/computed-testcommon.js"></script>
</head>
<body>
<div id="target"></div>
<style>
  #target {
    font-size: 40px;
  }
</style>
<script>
test_computed_value("scroll-margin-top", "10px");
test_computed_value("scroll-margin-top", "calc(10px - 0.5em)", "-10px");


test_computed_value("scroll-margin-right", "10px");
test_computed_value("scroll-margin-right", "calc(10px - 0.5em)", "-10px");


test_computed_value("scroll-margin-bottom", "10px");
test_computed_value("scroll-margin-bottom", "calc(10px - 0.5em)", "-10px");


test_computed_value("scroll-margin-left", "10px");
test_computed_value("scroll-margin-left", "calc(10px - 0.5em)", "-10px");


test_computed_value("scroll-margin", "10px");
test_computed_value("scroll-margin", "calc(10px - 0.5em)", "-10px");

test_computed_value("scroll-margin", "1px 2px");
</script>
</body>
</html>