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diff --git a/testing/web-platform/tests/css/css-values/round-mod-rem-computed.html b/testing/web-platform/tests/css/css-values/round-mod-rem-computed.html
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+++ b/testing/web-platform/tests/css/css-values/round-mod-rem-computed.html
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+<!DOCTYPE html>
+<link rel="help" href="https://drafts.csswg.org/css-values-4/#comp-func">
+<link rel="help" href="https://drafts.csswg.org/css-values-4/#numbers">
+<link rel="help" href="https://drafts.csswg.org/css-values-4/#calc-type-checking">
+<link rel="author" title="Apple Inc">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="../support/numeric-testcommon.js"></script>
+<div style="width: 75px;">
+    <div id="target"></div>
+</div>
+<script>
+// Simple tests
+test_math_used('round(10,10)', '10', {type:'number'});
+test_math_used('mod(1,1)', '0', {type:'number'});
+test_math_used('rem(1,1)', '0', {type:'number'});
+
+//Test basic round
+test_math_used('calc(round(100,10))', '100', {type:'number'});
+test_math_used('calc(round(up, 101,10))', '110', {type:'number'});
+test_math_used('calc(round(down, 106,10))', '100', {type:'number'});
+test_math_used('calc(round(to-zero,105, 10))', '100', {type:'number'});
+test_math_used('calc(round(to-zero,-105, 10))', '-100', {type:'number'});
+test_math_used('calc(round(-100,10))', '-100', {type:'number'});
+test_math_used('calc(round(up, -103,10))', '-100', {type:'number'});
+
+//Test basic mod/rem
+test_math_used('mod(18,5)', '3', {type:'number'});
+test_math_used('rem(18,5)', '3', {type:'number'});
+test_math_used('mod(-140,-90)', '-50', {type:'number'});
+test_math_used('mod(-18,5)', '2', {type:'number'});
+test_math_used('rem(-18,5)', '-3', {type:'number'});
+test_math_used('mod(140,-90)', '-40', {type:'number'});
+test_math_used('rem(140,-90)', '50', {type:'number'});
+
+//Test basic calculations
+test_math_used('calc(round(round(100,10), 10))', '100', {type:'number'});
+test_math_used('calc(round(up, round(100,10) + 1,10))', '110', {type:'number'});
+test_math_used('calc(round(down, round(100,10) + 2 * 3,10))', '100', {type:'number'});
+test_math_used('calc(round(to-zero,round(100,10) * 2 - 95, 10))', '100', {type:'number'});
+test_math_used('calc(round(round(100,10)* -1,10))', '-100', {type:'number'});
+test_math_used('calc(round(up, -103 + -103 / -103 - 1,10))', '-100', {type:'number'});
+test_math_used('calc(mod(18,5) * 2 + mod(17,5))', '8', {type:'number'});
+test_math_used('calc(rem(mod(18,5),5))', '3', {type:'number'});
+test_math_used('calc(rem(mod(18,5),mod(17,5)))', '1', {type:'number'});
+test_math_used('calc(mod(-140,-90))', '-50', {type:'number'});
+test_math_used('calc(mod(rem(1,18)* -1,5))', '4', {type:'number'});
+
+// Type check
+test_math_used('round(10px,6px)', '12px');
+test_math_used('round(10cm,6cm)', '12cm');
+test_math_used('round(10mm,6mm)', '12mm');
+test_math_used('round(10Q, 6Q)', '12Q');
+test_math_used('round(10in,6in)', '12in');
+test_math_used('round(10pc,6pc)', '12pc');
+test_math_used('round(10pt,6pt)', '12pt');
+test_math_used('round(10em,6em)', '12em');
+test_math_used('round(10ex,6ex)', '12ex');
+test_math_used('round(10ch,6ch)', '12ch');
+test_math_used('round(10rem,6rem)', '12rem');
+test_math_used('round(10vh,6vh)', '12vh');
+test_math_used('round(10vw,6vw)', '12vw');
+test_math_used('round(10vmin,6vmin)', '12vmin');
+test_math_used('round(10vmax,6vmax)', '12vmax');
+test_math_used('round(10s,6s)', '12s', {type:'time'});
+test_math_used('round(10ms,6ms)', '12ms', {type:'time'});
+test_math_used('round(10deg,6deg)', '12deg', {type:'angle', approx:0.1});
+test_math_used('round(10grad,6grad)', '12grad', {type:'angle', approx:0.1});
+test_math_used('round(10rad,6rad)', '12rad',{type:'angle', approx:0.1});
+test_math_used('round(10turn,6turn)', '12turn',{type:'angle', approx:0.1});
+
+test_math_used('mod(10px,6px)', '4px');
+test_math_used('mod(10cm,6cm)', '4cm');
+test_math_used('mod(10mm,6mm)', '4mm');
+test_math_used('mod(10Q, 6Q)', '4Q');
+test_math_used('mod(10in,6in)', '4in');
+test_math_used('mod(10pc,6pc)', '4pc');
+test_math_used('mod(10em,6em)', '4em');
+test_math_used('mod(10ex,6ex)', '4ex');
+test_math_used('mod(10ch,6ch)', '4ch');
+test_math_used('mod(10rem,6rem)', '4rem');
+test_math_used('mod(10vh,6vh)', '4vh');
+test_math_used('mod(10vw,6vw)', '4vw');
+test_math_used('mod(10vmin,6vmin)', '4vmin');
+test_math_used('mod(10vmax,6vmax)', '4vmax');
+test_math_used('mod(10s,6s)', '4s', {type:'time'});
+test_math_used('mod(10ms,6ms)', '4ms', {type:'time'});
+test_math_used('mod(10deg,6deg)', '4deg', {type:'angle', approx:0.1});
+test_math_used('mod(10grad,6grad)', '4grad', {type:'angle', approx:0.1});
+test_math_used('mod(10rad,6rad)', '4rad',{type:'angle', approx:0.1});
+test_math_used('mod(10turn,6turn)', '4turn',{type:'angle', approx:0.1});
+
+test_math_used('rem(10px,6px)', '4px');
+test_math_used('rem(10cm,6cm)', '4cm');
+test_math_used('rem(10mm,6mm)', '4mm');
+test_math_used('rem(10Q, 6Q)', '4Q');
+test_math_used('rem(10in,6in)', '4in');
+test_math_used('rem(10pc,6pc)', '4pc');
+test_math_used('rem(10em,6em)', '4em');
+test_math_used('rem(10ex,6ex)', '4ex');
+test_math_used('rem(10ch,6ch)', '4ch');
+test_math_used('rem(10rem,6rem)', '4rem');
+test_math_used('rem(10vh,6vh)', '4vh');
+test_math_used('rem(10vw,6vw)', '4vw');
+test_math_used('rem(10vmin,6vmin)', '4vmin');
+test_math_used('rem(10vmax,6vmax)', '4vmax');
+test_math_used('rem(10s,6s)', '4s', {type:'time'});
+test_math_used('rem(10ms,6ms)', '4ms', {type:'time'});
+test_math_used('rem(10deg,6deg)', '4deg', {type:'angle', approx:0.1});
+test_math_used('rem(10grad,6grad)', '4grad', {type:'angle', approx:0.1});
+test_math_used('rem(10rad,6rad)', '4rad',{type:'angle', approx:0.1});
+test_math_used('rem(10turn,6turn)', '4turn',{type:'angle', approx:0.1});
+
+//Test percentage and mixed units
+test_math_used('round(10%,1px)', '8px');
+test_math_used('round(10%,5px)', '10px');
+test_math_used('round(2rem,5px)', '30px');
+test_math_used('round(100px,1rem)', '96px');
+test_math_used('round(10s,6000ms)', '12s', {type:'time'});
+test_math_used('round(10000ms,6s)', '12s', {type:'time'});
+
+test_math_used('mod(10%,1px)', '0.5px');
+test_math_used('mod(10%,5px)', '2.5px');
+test_math_used('mod(2rem,5px)', '2px');
+test_math_used('mod(100px,1rem)', '4px');
+test_math_used('mod(10s,6000ms)', '4s', {type:'time'});
+test_math_used('mod(10000ms,6s)', '4s', {type:'time'});
+test_math_used('mod(18px,100% / 15)', '3px');
+test_math_used('mod(-18px,100% / 15)', '2px');
+test_math_used('mod(18%,5%)', '3%');
+test_math_used('mod(-18%,5%)', '2%');
+test_math_used('mod(18vw,5vw)', '3vw');
+test_math_used('mod(-18vw,5vw)', '2vw');
+
+test_math_used('rem(10%,1px)', '0.5px');
+test_math_used('rem(10%,5px)', '2.5px');
+test_math_used('rem(2rem,5px)', '2px');
+test_math_used('rem(100px,1rem)', '4px');
+test_math_used('rem(10s,6000ms)', '4s', {type:'time'});
+test_math_used('rem(10000ms,6s)', '4s', {type:'time'});
+test_math_used('rem(18px,100% / 15)', '3px');
+test_math_used('rem(-18px,100% / 15)', '-3px');
+test_math_used('rem(18vw,5vw)', '3vw');
+test_math_used('rem(-18vw,5vw)', '-3vw');
+
+</script>