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diff --git a/layout/style/test/test_pseudo_display_fixup.html b/layout/style/test/test_pseudo_display_fixup.html
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+++ b/layout/style/test/test_pseudo_display_fixup.html
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+<!doctype html>
+<meta charset=utf-8>
+<title>Test item blockification of pseudo-elements</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<style>
+  #test {
+    display: flex;
+  }
+  #test::before, #test::after {
+    content: "test";
+    display: inline-block;
+    color: green;
+    /*
+     * NOTE(emilio): The transition rule is very intentional, to avoid testing
+     * the eagerly resolved style.
+     */
+    transition: color 1s ease;
+  }
+</style>
+<div id="test"></div>
+<script>
+test(function() {
+  document.body.offsetTop;
+  let test = document.getElementById("test");
+  assert_equals(getComputedStyle(test, "::before").display, "block");
+  assert_equals(getComputedStyle(test, "::after").display, "block");
+}, "::before and ::after pseudo-elements are blockified");
+</script>