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chromium/third_party/blink/web_tests/wpt_internal/css/css-values/round-mod-rem-edge-cases.html 

<!doctype html>
<title>round() function extreme cases</title>
<meta charset=utf-8>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/support/numeric-testcommon.js"></script>

<meta name=author content="[email protected]">
<link rel=help href="https://drafts.csswg.org/css-values-4/#round-func">

<div id=target></div>
<script>
test_math_used('round(10, 10)', '10', {type:'number'});

test_math_used('round(1.49999999999999977795, 0.4999999999999999444888)', '1.49999999999999977795', {type:'number'});
test_math_used('round(up, 1.49999999999999977795, 0.4999999999999999444888)', '1.49999999999999977795', {type:'number'});
test_math_used('round(down, 1.49999999999999977795, 0.4999999999999999444888)', '0.999999999999999888978', {type:'number'});

test_math_used('calc(round(9007199254741000, 3) - 9007199254740992)', '8', {type:'number'});
test_math_used('calc(round(up, 9007199254741000, 3) - 9007199254740992)', '10', {type:'number'});
test_math_used('calc(round(down, 9007199254741000, 3) - 9007199254740992)', '8', {type:'number'});
</script>