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diff --git a/testing/web-platform/tests/trusted-types/trusted-types-duplicate-names.tentative.html b/testing/web-platform/tests/trusted-types/trusted-types-duplicate-names.tentative.html
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+++ b/testing/web-platform/tests/trusted-types/trusted-types-duplicate-names.tentative.html
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+<!DOCTYPE html>
+<head>
+ <script src="/resources/testharness.js"></script>
+ <script src="/resources/testharnessreport.js"></script>
+ <meta http-equiv="Content-Security-Policy"
+ content="trusted-types 'allow-duplicates' duplicatename default">
+</head>
+<body>
+<script>
+test(t => {
+ // We expect neither of these to throw.
+ let a = trustedTypes.createPolicy("duplicatename", { createHTML: _ => "a" });
+ let b = trustedTypes.createPolicy("duplicatename", { createHTML: _ => "b" });
+
+ // Both should have worked. They should still be separate functions.
+ assert_not_equals(a, b);
+ assert_equals("" + a.createHTML(""), "a");
+ assert_equals("" + b.createHTML(""), "b");
+
+ let def = trustedTypes.createPolicy("default", {});
+ assert_throws_js(TypeError,
+ _ => trustedTypes.createPolicy("default", {}));
+}, "policy - duplicate names");
+</script>
+</body>