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chromium/third_party/blink/web_tests/external/wpt/css/mediaqueries/display-mode.tentative.html 

<!DOCTYPE html>
<link rel="help" href="http://wicg.github.io/manifest-incubations/#display-mode-extensions" />
<script type="text/javascript" src="/resources/testharness.js"></script>
<script type="text/javascript" src="/resources/testharnessreport.js"></script>
<script type="text/javascript" src="resources/matchmedia-utils.js"></script>
<script>
  // These are meant to be moved to the non-tentative file one day when/if they
  // will be implemented in other browsers.
  query_should_be_known("(display-mode: borderless)");
  query_should_be_known("(display-mode: window-controls-overlay)");
</script>