link-header-modulepreload.html

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This WPT test may be referenced by the following Test IDs:
- /preload/link-header-modulepreload.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<meta charset=utf-8>

<title>Makes sure that Link headers support modulepreload</title>

<meta name="timeout" content="long">

<script src="/common/utils.js"></script>

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<script src="/preload/resources/preload_helper.js"></script>

<body>

<script>

    promise_test(async t => {

        const id = token();

        const moduleLink = getAbsoluteURL('./resources/module1.js');

        const params = new URLSearchParams();

        params.set('link', `<${moduleLink}>;rel=modulepreload`);

        params.set('type', 'text/html');

        params.set('file', 'modulepreload-iframe.html')

        const docURL = getAbsoluteURL(`./resources/echo-preload-header.py?${params.toString()}`);

        const iframe = document.createElement('iframe');

        t.add_cleanup(() => iframe.remove());

        iframe.src = docURL;

        const messageReceived = new Promise(resolve => window.addEventListener('message', m => {

            resolve(m.data);

}))

        document.body.appendChild(iframe);

        const result = await messageReceived;

        assert_equals(result, 1);

    }, 'test that a header-preloaded module is loaded and consumed');

</script>

</body>