link-preconnect-dynamic.html | Explore in Territory

<!DOCTYPE html>
<script>
    if (window.testRunner) {
        testRunner.dumpAsText();
        testRunner.dumpChildFrames();
    }
    if (window.internals)
        internals.settings.setLogDnsPrefetchAndPreconnect(true);
    window.onload = function() {
        var o=document.createElement("LINK");
        o.setAttribute("rel", "preconnect");
        o.setAttribute("href", "http://preconnect.com.test/");
        document.head.appendChild(o);
    };
</script>
This test verifies that a preconnect request is sent and logged when a
link element is added dynamically.

chromium/third_party/blink/web_tests/fast/dom/HTMLLinkElement/link-preconnect-dynamic.html