wpt/css/css-transitions/transition-in-iframe-001.html at master · web-platform-tests/wpt · GitHub

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<!DOCTYPE html>

<html>

<title>Transitions: Transition in &lt;iframe&gt; on page with empty rAF finishes</title>
<link rel="help" href="https://drafts.csswg.org/css-view-transitions-1/">
<link rel="author" href="mailto:mrobinson@igalia.com">
<link rel="author" href="mailto:obrufau@igalia.com">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/common/rendering-utils.js"></script>

<style>
    #iframe {
        width: 100px;
        height: 100px;
        border: none;
    }
</style>

<script>
    let rAFId = null;
    function triggerNeverEndingUselessRAF() {
        rAFId = requestAnimationFrame(triggerNeverEndingUselessRAF);
    }

    promise_test(async t => {
        await waitForAtLeastOneFrame();
        await waitForAtLeastOneFrame();

        let iframe = document.createElement("iframe");
        iframe.id = "iframe";
        iframe.src = "support/transition-in-iframe-001-iframe.html"
        iframe.sandbox = "allow-scripts";

        iframe.addEventListener("load", async () => {
            await waitForAtLeastOneFrame();
            await waitForAtLeastOneFrame();
            iframe.contentWindow.postMessage("loaded", "*");
        });

        triggerNeverEndingUselessRAF();
        document.body.appendChild(iframe);

        await new Promise(resolve => {
            window.addEventListener("message", () => {
                cancelAnimationFrame(rAFId);
                resolve();
            });
        });
    });
</script>

</html>