supported-as-values.html

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<!DOCTYPE html>

<html>

<title>Test the supported value for &lt;link rel=preload as="..."&gt;</title>

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

<meta name="variant" content="?as=image&expected=1">

<meta name="variant" content="?as=fetch&expected=1">

<meta name="variant" content="?as=font&expected=1">

<meta name="variant" content="?as=script&expected=1">

<meta name="variant" content="?as=style&expected=1">

<meta name="variant" content="?as=track&expected=1">

<meta name="variant" content="?as=garbagefoobar&expected=0">

<meta name="variant" content="?as=video&expected=0">

<meta name="variant" content="?as=audio&expected=0">

<meta name="variant" content="?as=object&expected=0">

<meta name="variant" content="?as=iframe&expected=0">

<meta name="variant" content="?as=worklet&expected=0">

<meta name="variant" content="?as=json&expected=0">

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

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

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

<body>

<script>

    const params = new URLSearchParams(location.search);

    const as = params.get("as");

    const expected = Number(params.get("expected"));

    promise_test(async t => {

        const link = document.createElement("link");

        link.href = new URL("/common/echo.py?content=nothing", location.href).href;

        link.rel = "preload";

        link.as = as;

        document.head.append(link);

        await new Promise(resolve => {

            t.step_timeout(resolve, 1000);

            link.addEventListener("load", resolve);

            link.addEventListener("error", resolve);

});

        const resources = performance.getEntriesByName(link.href);

        assert_equals(resources.length, expected);

});

</script>

</body>

</html>