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diff --git a/testing/web-platform/tests/html/rendering/non-replaced-elements/flow-content-0/form-margin-quirk.html b/testing/web-platform/tests/html/rendering/non-replaced-elements/flow-content-0/form-margin-quirk.html
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+++ b/testing/web-platform/tests/html/rendering/non-replaced-elements/flow-content-0/form-margin-quirk.html
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+<!-- quirks -->
+<title>form margin quirk</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<style>
+form { writing-mode: vertical-lr; }
+#ref { margin: 0 1em 0 0; }
+</style>
+<form id=form></form>
+<div id=ref></div>
+<script>
+test(() => {
+ const formStyle = getComputedStyle(document.getElementById('form'));
+ const refStyle = getComputedStyle(document.getElementById('ref'));
+ assert_equals(formStyle.marginTop, refStyle.marginTop, 'marginTop');
+ assert_equals(formStyle.marginRight, refStyle.marginRight, 'marginRight');
+ assert_equals(formStyle.marginBottom, refStyle.marginBottom, 'marginBottom');
+ assert_equals(formStyle.marginLeft, refStyle.marginLeft, 'marginLeft');
+});
+</script>