third_party/WebKit/LayoutTests/http/tests/linkHeader/link-dnsprefetch-in-css.html


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<!DOCTYPE html>
<script>
    if (window.testRunner) {
        testRunner.dumpAsText();
        testRunner.waitUntilDone();
    }
    if (window.internals) {
        internals.settings.setLogDnsPrefetchAndPreconnect(true);
        internals.settings.setLinkHeaderEnabled(true);
    }
    document.write("<link rel='stylesheet' href='resources/link-dnsprefetch-image.php' onload='if (window.testRunner)testRunner.notifyDone()'>");
</script>
This test checks if a Link header inside an iframe triggered a dns prefetch.