meta.html

<!doctype html>
<html lang="en">

  <head>
    <meta charset="utf-8">
    <title>Verovio App demo</title>
    <style>
    html, body {
        width: 100%;
        height: 100%;
        margin: 0;
    }
    .header {
        padding: 20px;
    }
    #app {
        height: auto;
        width: 100%;
        position: absolute;
        top: 160px;
        bottom: 0;
    }
    </style>
</head>

  <body>

    <div class="header" id="meta"></div>
    <div id="app">Verovio is loading...</div>
    <script type="module">
        import 'https://www.verovio.org/javascript/app/verovio-app.js';
        
        const options = {
            defaultView: 'responsive', // default is 'responsive', alternative is 'document'
            defaultZoom: 3, // 0-7, default is 4
            enableResponsive: true, // default is true
            enableDocument: true // default is true
        }
        
        // A MusicXML file
        var file = 'data/example.mei';
        // A MEI file
        //var file = 'https://www.verovio.org/editor/brahms.mei';
        
        const app = new Verovio.App(document.getElementById("app"), options);
        fetch(file)
            .then(function(response) {
                return response.text();
            })
            .then(function(text) {
                app.loadData(text);
            });
    </script>
    
   <script>
      var xhr = new XMLHttpRequest()
      xhr.open('GET', 'data/example.mei') //  change this to the right file
      xhr.send(null)
      /* Deal with the response */
      xhr.onreadystatechange = function () {
        var DONE = 4
        var OK = 200
        if (xhr.readyState === DONE) {
          if (xhr.status === OK) {
            var parser = new DOMParser()
            var meiDoc = parser.parseFromString(xhr.responseText,"text/xml")
            document.querySelector("#meta").innerHTML += "<h1>" + meiDoc.querySelector("[*|id='title12345']").textContent + "</h1>" 
            document.querySelector("#meta").innerHTML += "<p><strong>Composer:</strong> <a href=\"" + meiDoc.querySelector("[*|id='pers12345']").getAttribute('authURI') + "\">" + meiDoc.querySelector("[*|id='pers12345']").textContent + "</a></p>"
            
          }
        }
      }
    </script>
    
  </body>

</html>