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

<!DOCTYPE html>
<html class="reftest-wait">
<title>Embedded Style: URLs, only allow data URLs</title>
<link rel="match" href="embedded_style_urls-ref.html">
<link rel="help" href="https://w3c.github.io/webvtt/#obtaining-css-boxes">
<script src="/common/reftest-wait.js"></script>
<video width="320" height="180" autoplay onplaying="this.onplaying = null; this.pause(); takeScreenshot();">
    <source src="/media/white.webm" type="video/webm">
    <source src="/media/white.mp4" type="video/mp4">
    <track src="support/embedded_style_urls.vtt" default>
</video>
</html>