chromium/third_party/blink/web_tests/external/wpt/html/semantics/embedded-content/media-elements/audio_controls_present-manual.html

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<html>
  <head>
    <title>Audio Test: audio_controls_present.html</title>
    <link rel="author" title="Intel" href="http://www.intel.com" />
    <link rel="help" href="https://html.spec.whatwg.org/multipage/#dom-media-controls" />
    <meta name="flags" content="" />
    <meta name="assert" content="Check if the controls attribute is present in the audio element that expecting the user agent exposes a controller user interface" />
  </head>
  <body>
    <p>Test passes if a controller user interface appears below and the text 'The user agent doesn't support media element.' does not appear anywhere on this page</p>
    <audio id="m" controls>The user agent doesn't support media element.</audio>
  </body>
</html>