embed.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <title>Embedded Verovio App</title>
    <style>
    html, body {
        width: 100%;
        height: 100%;
        margin: 0;
    }
    #app {
        height: 100%;
        width: 100%;
    }
    </style>
</head>
<body>
    <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
        }
        
        function getParameterByName( name )
        {
            var match = RegExp( '[?&]' + name + '=([^&]*)' ).exec( window.location.search );
            return match && decodeURIComponent( match[1].replace( /\+/g, ' ' ) );
        }
        
        // A MEI file
        let file = 'https://www.verovio.org/editor/brahms.mei';
        
        let urlFile = getParameterByName( 'file' );
        if ( urlFile != null )
        {
            file = urlFile;
        }
        
        const app = new Verovio.App(document.getElementById("app"), options);
        fetch(file)
            .then(function(response) {
                return response.text();
            })
            .then(function(text) {
                app.loadData(text);
            });
    </script>
</body>
</html>