Spa in github not working

<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8">
    <title>Single Page Apps for GitHub Pages</title>
    <script type="text/javascript">
        // Single Page Apps for GitHub Pages
        // https://github.com/rafrex/spa-github-pages
        // Copyright (c) 2016 Rafael Pedicini, licensed under the MIT License
        // ----------------------------------------------------------------------
        // This script takes the current url and converts the path and query
        // string into just a query string, and then redirects the browser
        // to the new url with only a query string and hash fragment,
        // e.g. http://www.foo.tld/one/two?a=b&c=d#qwe, becomes
        // http://www.foo.tld/?p=/one/two&q=a=b~and~c=d#qwe
        // Note: this 404.html file must be at least 512 bytes for it to work
        // with Internet Explorer (it is currently > 512 bytes)

        // If you're creating a Project Pages site and NOT using a custom domain,
        // then set segmentCount to 1 (enterprise users may need to set it to > 1).
        // This way the code will only replace the route part of the path, and not
        // the real directory in which the app resides, for example:
        // https://username.github.io/repo-name/one/two?a=b&c=d#qwe becomes
        // https://username.github.io/repo-name/?p=/one/two&q=a=b~and~c=d#qwe
        // Otherwise, leave segmentCount as 0.
        var segmentCount = 0;

        var l = window.location;
        l.replace(
            l.protocol + '//' + l.hostname + (l.port ? ':' + l.port : '') +
            l.pathname.split('/').slice(0, 1 + segmentCount).join('/') + '/?p=/' +
            l.pathname.slice(1).split('/').slice(segmentCount).join('/').replace(/&/g, '~and~') +
            (l.search ? '&q=' + l.search.slice(1).replace(/&/g, '~and~') : '') +
            l.hash
        );
    </script>
</head>

<body>
</body>

</html>

Source: stackoverflow.com

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