<!DOCTYPE html>
<meta charset="utf-8">
<link rel="help" href="https://drafts.fxtf.org/filter-effects/#FilterProperty">
<link rel="help" href="https://drafts.csswg.org/css-values-4/#sign-funcs">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="../support/numeric-testcommon.js"></script>
<style>
    #target {
        font-size: 10px;
    }
</style>
<div id="target"></div>
<script>

test_math_used('contrast(calc(sign(1em - 1px) * 2))', 'cont