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<!doctype html><html>  <head>    <title>Cross-origin resouce status leak via MediaError </title>  </head>  <body>    <div id="contents">      <p><code>MediaError</code> message property can be used to        detect cross-origin response status.</p>
      
      <p>When a cross-origin request succeeds (200 OK), <code>MediaError.message</code>        will be <code>"Failed to init decoder"</code>. The same message will be <code>"404: Not Found"</code>        for URLs that are not found. The difference can be used to detect        cross-origin response status.</p>            <p>Compare <strong><code>https://stackoverflow.com/404</code></strong> and        <strong><code>https://stackoverflow.com/</code></strong> using the input box below.</p>            <input id="testUrl" type="text" value="https://stackoverflow.com/404"></input>      <button id="startTest">Test</button>      <audio autoplay id="audio"></audio>      <div id="log"></div>    </div>  </body></html>

#contents {

// Based on MDN MediaError example: https://mdn.github.io/dom-examples/media/mediaerror/

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:reset - destroy state and start afresh :history - list current session history :load <url> - to inject new DOM :load <script_url> - to inject external library load also supports following shortcuts:
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