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chromium/third_party/blink/web_tests/external/wpt/webvtt/rendering/cues-with-video/processing-model/regions/regionanchor_y_50_percent-ref.html 

<!DOCTYPE html>
<title>Reference for WebVTT rendering regions, regionanchor y 50%</title>
<style>
html { overflow:hidden }
body { margin:0 }
</style>