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diff --git a/testing/web-platform/tests/css/css-values/minmax-length-percent-serialize.html b/testing/web-platform/tests/css/css-values/minmax-length-percent-serialize.html
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+++ b/testing/web-platform/tests/css/css-values/minmax-length-percent-serialize.html
@@ -0,0 +1,126 @@
+<!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/#mixed-percentages">
+<link rel="help" href="https://drafts.csswg.org/css-values-4/#calc-serialize">
+<link rel="author" title="Xiaocheng Hu" href="mailto:xiaochengh@chromium.org">
+<link rel="author" title="Tab Atkins-Bittner" href="https://xanthir.com/contact">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="../support/serialize-testcommon.js"></script>
+<div style="width: 100px;">
+    <div id=target></div>
+</div>
+<script>
+function test_serialization(t,s,c,u, {prop}={}) {
+    test_specified_serialization(prop || 'text-indent', t, s);
+    test_computed_serialization(prop || 'text-indent', t, c);
+    if(u) test_used_serialization(prop || 'margin-left', t, u);
+}
+
+// If fully resolvable to a number, serialize to a calc() or all the way to a number.
+test_serialization(
+    'min(1px)',
+    'calc(1px)',
+    '1px',
+    '1px');
+test_serialization(
+    'max(1px)',
+    'calc(1px)',
+    '1px',
+    '1px');
+
+// If not, keep as the function.
+test_serialization(
+    'min(1% + 1px)',
+    'calc(1% + 1px)',
+    'calc(1% + 1px)',
+    '2px');
+test_serialization(
+    'min(1px + 1%)',
+    'calc(1% + 1px)',
+    'calc(1% + 1px)',
+    '2px');
+test_serialization(
+    'max(1px + 1%)',
+    'calc(1% + 1px)',
+    'calc(1% + 1px)',
+    '2px');
+
+// Arguments are simplified eagerly as per spec:
+test_serialization(
+    'min(1px, 2px)',
+    'calc(1px)',
+    '1px',
+    '1px');
+
+// Arguments are simplified, but not reordered.
+test_serialization(
+    'min(20px, 10%)',
+    'min(20px, 10%)',
+    'min(20px, 10%)',
+    '10px');
+test_serialization(
+    'min(1em, 10%)',
+    'min(1em, 10%)',
+    'min(16px, 10%)',
+    '10px');
+test_serialization(
+    'min(10%, 20px)',
+    'min(10%, 20px)',
+    'min(10%, 20px)',
+    '10px');
+test_serialization(
+    'min(10%, 1em)',
+    'min(10%, 1em)',
+    'min(10%, 16px)',
+    '10px');
+test_serialization(
+    'max(20px, 10%)',
+    'max(20px, 10%)',
+    'max(20px, 10%)',
+    '20px');
+test_serialization(
+    'max(1em, 10%)',
+    'max(1em, 10%)',
+    'max(16px, 10%)',
+    '16px');
+test_serialization(
+    'max(10%, 20px)',
+    'max(10%, 20px)',
+    'max(10%, 20px)',
+    '20px');
+test_serialization(
+    'max(10%, 1em)',
+    'max(10%, 1em)',
+    'max(10%, 16px)',
+    '16px');
+
+// Within an argument, normal sorting occurs
+test_serialization(
+    'min(10% + 30px, 5em + 5%)',
+    'min(10% + 30px, 5% + 5em)',
+    'min(10% + 30px, 5% + 80px)',
+    '40px');
+test_serialization(
+    'max(10% + 30px, 5em + 5%)',
+    'max(10% + 30px, 5% + 5em)',
+    'max(10% + 30px, 5% + 80px)',
+    '85px');
+
+// min()/max() are valid inside a calc(),
+// and retain their relative order
+test_serialization(
+    'calc(min(10% + 1px) + max(1em + 10%) + min(10% + 20px))',
+    'calc(30% + 1em + 21px)',
+    'calc(30% + 37px)',
+    '67px');
+
+// min()/max() can be combined with plain units as well.
+// While min()/max() maintain their own ordering,
+// ordinary units will re-sort around them.
+test_serialization(
+    'calc(1em + max(10% + 20px) + 5% + min(1em + 10%) + 10px)',
+    'calc(25% + 2em + 30px)',
+    'calc(25% + 62px)',
+    '87px');
+</script>