dynamic-adding-preload-imagesrcset.html

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This WPT test may be referenced by the following Test IDs:
- /preload/dynamic-adding-preload-imagesrcset.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 a dynamically added preload with imagesrcset works');

</script>

<body>

<script>

    t.step(function() {

        verifyPreloadAndRTSupport();

        var expectation = new Array(4).fill(0);

        if (window.devicePixelRatio < 1.5) {

          expectation[2] = 1;

        } else if (window.devicePixelRatio >= 1.5) {

          expectation[3] = 1;

        var link = document.createElement("link");

        link.as = "image";

        link.rel = "preload";

        link.href = "resources/square.png?default";

        link.imageSrcset = "resources/square.png?200 200w, resources/square.png?400 400w, resources/square.png?800 800w";

        link.imageSizes = "400px";

        link.onload = t.step_func(function() {

            t.step_timeout(function() {

                verifyNumberOfResourceTimingEntries("resources/square.png?default", expectation[0]);

                verifyNumberOfResourceTimingEntries("resources/square.png?200", expectation[1]);

                verifyNumberOfResourceTimingEntries("resources/square.png?400", expectation[2]);

                verifyNumberOfResourceTimingEntries("resources/square.png?800", expectation[3]);

                t.done();

            }, 0);

});

        document.body.appendChild(link);

});

</script>

</body>