index.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>wmf2svg</title>
    <script src="wasm_exec.js"></script>
    <script>
        const go = new Go();
        WebAssembly.instantiateStreaming(fetch("wmf.wasm"), go.importObject)
            .then((result) => go.run(result.instance));


        function parse() {
            var input = window.document.getElementById("file")
            if (input.files.length <= 0) {
                return
            }

            var images = document.getElementById('images')
            var reader = new FileReader();
            reader.onload = function() {
                var base64Svg = Wmf2Svg(reader.result)
                images.innerHTML = '<img src="'+base64Svg+'" />'
            }
            reader.readAsDataURL(input.files[0]);
        }

    </script>
</head>
<body>
<input id="file" type="file" title="select a wmf file" onchange="parse()"/>
<div id="images">

</div>
</body>
</html>