link-header-preload-delay-onload.html

Enable keyboard shortcuts

This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /preload/link-header-preload-delay-onload.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<script src="/preload/resources/preload_helper.js"></script>

<script>

    var t = async_test('Makes sure that Link headers preload resources and block window.onload after resource discovery');

</script>

<body>

<style>

    #background {

        width: 200px;

        height: 200px;

        background-image: url(resources/square.png?background);

</style>

<link rel="stylesheet" href="resources/dummy.css?link-header-preload-delay-onload">

<script src="resources/dummy.js?link-header-preload-delay-onload"></script>

<div id="background"></div>

<script>

    document.write('<img src="resources/square.png?link-header-preload-delay-onload">');

    window.addEventListener("load", t.step_func(function() {

        verifyPreloadAndRTSupport();

        var entries = performance.getEntriesByType("resource");

        var found_background_first = false;

        for (var i = 0; i < entries.length; ++i) {

            var entry = entries[i];

            if (entry.name.indexOf("square") != -1) {

                if (entry.name.indexOf("background") != -1)

                    found_background_first = true;

                break;

        assert_true(found_background_first);

        verifyLoadedAndNoDoubleDownload("resources/square.png?link-header-preload-delay-onload");

        verifyLoadedAndNoDoubleDownload("resources/square.png?background");

        verifyLoadedAndNoDoubleDownload("resources/dummy.js?link-header-preload-delay-onload");

        verifyLoadedAndNoDoubleDownload("resources/dummy.css?link-header-preload-delay-onload");

        t.done();

    }));

</script>