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<!DOCTYPE html>
<html>
<head>
<title>Modulepreload Referrer Header Check</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
// Initialize the window.referrers object that will be used by echo-referrer.py
window.referrers = {};
</script>
</head>
<body>
<iframe id="test-frame"></iframe>
<script>
// This test uses a simple approach to check if modulepreload sends a referrer header
promise_test(async t => {
const importId = Date.now();
const preloadId = Date.now() + 1;
// Import will set window.referrers[importId] to the referrer value
await import(`/preload/resources/echo-referrer.py?uid=${importId}`);
const link = document.createElement('link');
link.rel = 'modulepreload';
link.href = `/preload/resources/echo-referrer.py?uid=${preloadId}`;
// Wait for the preload to complete using onload event
const preloadComplete = new Promise(resolve => {
link.onload = resolve;
link.onerror = () => {
assert_unreached("Modulepreload failed to load");
};
});
document.head.appendChild(link);
await preloadComplete;
// Second import ensures the module is loaded and referrer is recorded
await import(`/preload/resources/echo-referrer.py?uid=${preloadId}`);
// Check if referrers were recorded in the global window.referrers object
assert_equals(window.referrers[importId], location.href, "Dynamic import should have a referrer header");
assert_equals(window.referrers[preloadId], location.href, "Modulepreload should have a referrer header");
}, "Modulepreload should send a referrer header");
</script>
</body>
</html>
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