Blitz - WPT: fetch-resources.sub.html

wpt / css / fetching / fetch-resources.sub.html

Data from commit:
a50cb89 wpt: run reference-named files which are themselves tests (#836) (2026-09-03)

Subtest	Status	Message
Background images should fetch with no-cors	FAIL	promise_test: Unhandled rejection with value: object "ReferenceError: PerformanceObserver is not defined"
Shape images should fetched with cors	FAIL	promise_test: Unhandled rejection with value: object "ReferenceError: PerformanceObserver is not defined"
WebFonts should be fetched with cors	FAIL	promise_test: Unhandled rejection with value: object "ReferenceError: PerformanceObserver is not defined"
CSS imports should be fetched without cors	FAIL	promise_test: Unhandled rejection with value: object "ReferenceError: PerformanceObserver is not defined"

Enable JavaScript in test iframe

/css/fetching/fetch-resources.sub.html

<!DOCTYPE HTML>
<html>
<head>
<title>Test various interactions between fetch, service-workers and resource timing</title>
<meta charset="utf-8" />
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="support/echo-helper.js"></script>
<link rel=help href="https://github.com/w3c/csswg-drafts/pull/6715">
</head>

<body>
<script>
    const image_url = '/css/support/1x1-green.png'
    const font_url = '/fonts/pass.woff'
    const stylesheet_url = '/css/support/a-green.css'

    async function load_image({url, prop, uid}, t) {
        const element = document.createElement('div');
        const echo = get_resource_echo_url(uid, url)
        element.style[prop] = `url(${echo})`
        document.body.appendChild(element);
        t.add_cleanup(() => element.remove());
        await wait_for_resource(echo);
        const headers = await get_headers(uid);
        return headers[url]
    }

    async function load_font({url, uid}, t) {
        const echo = get_resource_echo_url(uid, url)
        const style = `
          @font-face { font-family: "SomeFont"; src: url(${echo}); }
        `
        const styleElement =  document.createElement('style')
        styleElement.innerHTML = style
        document.head.appendChild(styleElement)
        const element = document.createElement('p')
        element.innerText = "SomeFont"
        element.style.fontFamily = 'SomeFont'
        document.body.appendChild(element)
        t.add_cleanup(() => element.remove())
        t.add_cleanup(() => styleElement.remove())
        await wait_for_resource(echo);
        const headers = await get_headers(uid);
        return headers[url]
    }

    async function load_stylesheet({url, uid}, t) {
        const echo = get_resource_echo_url(uid, url)
        const styleElement =  document.createElement('style')
        styleElement.innerHTML = `@import "${echo}"`
        document.head.appendChild(styleElement)
        t.add_cleanup(() => styleElement.remove())
        await wait_for_resource(echo);
        const headers = await get_headers(uid);
        return headers[url]
    }

    function load_style(text, host, t) {
        const styleElement =  document.createElement('style');
        const styleURL = `${host || window.origin}/css/fetching/support/echo-css.py?content=${encodeURIComponent(text)}`;
        styleElement.innerHTML = `@import "${styleURL}"`;
        document.head.appendChild(styleElement);
        t.add_cleanup(() => styleElement.remove());
        return styleURL
    }

    function extract_cors_mode(result) {
        const fetchMode = result['sec-fetch-mode'];
        if (fetchMode)
            return fetchMode;

        return Reflect.has(result, 'origin') ? 'cors' : 'no-cors';
    }

    promise_test(async t => {
        const uid = "{{uuid()}}";
        const result = await load_image({uid, url: image_url, prop: 'background'}, t)
        assert_equals(extract_cors_mode(result), 'no-cors');
    }, 'Background images should fetch with no-cors');

    promise_test(async t => {
        const uid = "{{uuid()}}";
        const result = await load_image({uid, url: image_url, prop: 'shape-outside'}, t)
        assert_equals(extract_cors_mode(result), 'cors');
    }, 'Shape images should fetched with cors');

    promise_test(async t => {
        const uid = "{{uuid()}}";
        const result = await load_font({uid, url: font_url}, t)
        assert_equals(extract_cors_mode(result), 'cors');
    }, "WebFonts should be fetched with cors")

    promise_test(async t => {
        const uid = "{{uuid()}}";
        const result = await load_stylesheet({uid, url: stylesheet_url}, t)
        assert_equals(extract_cors_mode(result), 'no-cors');
    }, "CSS imports should be fetched without cors")
</script>

</body>
</html>