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chromium/third_party/blink/web_tests/external/wpt/preload/link-header-on-subresource.html 

<!DOCTYPE html>
<title>Makes sure that Link headers on subresources preload resources</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/preload/resources/preload_helper.js"></script>
<link rel=stylesheet href="resources/dummy-preloads-subresource.css?link-header-on-subresource">
<script>
    setup({single_test: true});

    var iterations = 0;

    function check_finished() {
        if (numberOfResourceTimingEntries("/fonts/CanvasTest.ttf?link-header-on-subresource") == 1) {
            done();
        }
        iterations++;
        if (iterations == 10) {
             // This is expected to fail, but this should give details to the exact failure.
            verifyNumberOfResourceTimingEntries("/fonts/CanvasTest.ttf?link-header-on-subresource", 1);
            done();
        } else {
            step_timeout(check_finished, 500);
        }
    }

    window.addEventListener("load", function() {
        verifyPreloadAndRTSupport();
        step_timeout(check_finished, 500);
    });
</script>