preload-font-crossorigin.html | Explore in Territory

<!DOCTYPE html>
<title>Makes sure that preload font destination needs crossorigin attribute</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/preload/resources/preload_helper.js"></script>
<script src="/common/get-host-info.sub.js"></script>
<body>
<script>
    const run_test = (preload_success, main_load_success, name,
                      resource_url, cross_origin, number_of_requests) => {
        const test = async_test(name);
        const link = document.createElement('link');
        link.rel = 'preload';
        link.as = 'font';
        link.href = resource_url;
        if (cross_origin) {
            link.crossOrigin = 'anonymous';
        }

        const valid_preload_failed = test.step_func(() => {
            assert_unreached('Valid preload fired error handler.');
        });
        const invalid_preload_succeeded = test.step_func(() => {
            assert_unreached('Invalid preload load succeeded.');
        });
        const valid_main_load_failed = test.step_func(() => {
            assert_unreached('Valid main load fired error handler.');
        });
        const invalid_main_load_succeeded = test.step_func(() => {
            assert_unreached('Invalid main load succeeded.');
        });
        const main_load_pass = test.step_func(() => {
            verifyNumberOfResourceTimingEntries(resource_url, number_of_requests);
            test.done();
        });

        const preload_pass = test.step_func(async () => {
            try {
                await new FontFace('CanvasTest', `url("${resource_url}")`).load();
            } catch (error) {
                if (main_load_success) {
                    valid_main_load_failed();
                } else {
                    main_load_pass();
                }
            }

            if (main_load_success) {
                main_load_pass();
            } else {
                invalid_main_load_succeeded();
            }
        });

        if (preload_success) {
            link.onload = preload_pass;
            link.onerror = valid_preload_failed;
        } else {
            link.onload = invalid_preload_succeeded;
            link.onerror = preload_pass;
        }

        document.body.appendChild(link);
    };

    verifyPreloadAndRTSupport();

    const anonymous = '&pipe=header(Access-Control-Allow-Origin,*)';
    const cross_origin_prefix = get_host_info().REMOTE_ORIGIN;
    const file_path = '/fonts/CanvasTest.ttf';

    // The CSS Font spec defines that font files always have to be fetched using
    // anonymous-mode CORS.
    // See https://developer.mozilla.org/en-US/docs/Web/HTML/Link_types/preload#cors-enabled_fetches
    // and https://www.w3.org/TR/css-fonts-3/#font-fetching-requirements
    // So that font loading (@font-face in CSS and FontFace.load()) always sends request
    // with anonymous-mode CORS. The crossOrigin attribute of <link rel="preload" as="font">
    // should be set as anonymout mode, too, even for same origin fetch. Otherwise,
    // main font loading doesn't match the corresponding preloading due to credentials
    // mode mismatch and the main font loading invokes another request.
    run_test(true, true, 'Same origin font preload with crossorigin attribute',
             file_path + '?with_crossorigin', true, 1);
    run_test(true, true, 'Same origin font preload without crossorigin attribute',
             file_path + '?without_crossorigin', false, 2);
    run_test(true, true, 'Cross origin font preload with crossorigin attribute',
             cross_origin_prefix + file_path + '?with_crossorigin' + anonymous, true, 1);
    run_test(true, true, 'Cross origin font preload without crossorigin attribute',
             cross_origin_prefix + file_path + '?without_crossorigin' + anonymous, false, 2);
</script>
</body>
</html>
chromium/third_party/blink/web_tests/external/wpt/preload/preload-font-crossorigin.html
