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chromium/third_party/blink/web_tests/external/wpt/webvtt/rendering/cues-with-video/processing-model/embedded_style_media_queries.html 

<!doctype html>
<html class="reftest-wait">
<title>Embedded Style: Media Queries</title>
<link rel="match" href="embedded_style_media_queries-ref.html">
<script src="/common/reftest-wait.js"></script>
<style>iframe {width:100%; height:500px}</style>
<script>
    onload = function() {
        let iframeWindow = document.querySelector('iframe').contentWindow;
        iframeWindow.requestAnimationFrame(() => {
            iframeWindow.requestAnimationFrame(() => {
                setTimeout(function() {
                    takeScreenshot();
                }, 100);
            });
        });
    };
</script>
<iframe src="support/embedded_style_media_queries-iframe.html"></iframe>