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Test Info:

<!DOCTYPE html>
<title>CSS integration - child css via a ProcessingInstruction</title>
<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>
<meta name="referrer" content="origin">
<p>Check that child css are loaded with the referrer and referrer policy the
external stylesheet(referenced from a ProcessingInstruction).</p>
<div class="styled"></div>
promise_test(function(css_test) {
let id = token();
let url_prefix = location.protocol + "//www1." + location.hostname + ":" +
location.port +
"/common/security-features/subresource/" +
let css_url = url_prefix + "&amp;import-rule";
let expected = url_prefix + "&import-rule";
let check_url = url_prefix + "&report-headers";
let processingInstruction =
"xml-stylesheet", "href=\"" +css_url + "\" type=\"text/css\"");
document.insertBefore(processingInstruction, document.firstChild);
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, expected);
}, "Child css via a ProcessingInstruction.");
<div id="log"></div>