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diff --git a/testing/web-platform/tests/referrer-policy/css-integration/child-css/internal-import-stylesheet-with-differentorigin-base-url.tentative.html b/testing/web-platform/tests/referrer-policy/css-integration/child-css/internal-import-stylesheet-with-differentorigin-base-url.tentative.html
new file mode 100644
index 0000000000..7130e2a14a
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+++ b/testing/web-platform/tests/referrer-policy/css-integration/child-css/internal-import-stylesheet-with-differentorigin-base-url.tentative.html
@@ -0,0 +1,47 @@
+<!DOCTYPE html>
+<title>CSS integration - Child css from internal stylesheet</title>
+<link rel="help" href="https://crbug.com/1158645" />
+
+<head>
+  <meta name="referrer" content="origin">
+</head>
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/common/utils.js"></script>
+<!-- Common global functions for referrer-policy tests. -->
+<script src="/common/security-features/resources/common.sub.js"></script>
+
+<!-- This has to follow the <script> tags, or it will make the .js files
+fail to load. -->
+<base href="http://other-site.example" />
+
+<script>
+  promise_test(function (css_test) {
+      let id = token();
+      let url_prefix = location.protocol + "//www1." + location.hostname +
+        ":" + location.port;
+      let css_url = url_prefix +
+        "/common/security-features/subresource/stylesheet.py?id=" + id +
+        "&stylesheet-only";
+      let check_url = url_prefix +
+        "/common/security-features/subresource/stylesheet.py" +
+        "?id=" + id + "&report-headers";
+
+      let style = document.createElement("style");
+      style.type = 'text/css';
+      style.appendChild(document.createTextNode("@import url('" + css_url +
+        "');"));
+      document.head.appendChild(style);
+      return timeoutPromise(css_test, 1000)
+        .then(() => requestViaXhr(check_url))
+        .then(function (message) {
+          assert_own_property(message, "headers");
+          assert_own_property(message, "referrer");
+          assert_equals(message.referrer, location.origin + "/");
+        });
+    },
+    "A child stylesheet from inline style should use the document's URL, not " +
+    "the document's base URL, as its referrer."
+  );
+</script>