Bootstrap 4 IE 11 does not work : <p>so I have the problem, that my whole website does not work in IE 11. I don't get why because officially IE 11 should be supported by bootstrap 4...
Website: www.ergotherapie-klinkicht.de
I'm a bit helpless right now, because I don't know where to start. Did I miss something for IE 11 to inlcude in my code?</p>

<p>In Firefox, , Edge, Chrome and Safari it works just fine...</p>

<p>Because right now, I have the feeling that bootstrap 4 is not compatible for IE 11 at all...</p>

<p>Thanks for any reply!</p>

<p>this is my navbar for example, it is not visible in IE 11:</p>

<pre><code>#logonav {

   height: 40px; 
    width: auto;
}

/* change the link color */
.navbar-custom .navbar-nav .nav-link {
    color: #2E8B57;
}
/* change the color of active or hovered links */
.navbar-custom .nav-item .nav-link .active,
.navbar-custom .nav-item:hover .nav-link {
    color: orangered; 
}

/* change the brand and text color */
.navbar-custom .navbar-brand,
.navbar-custom .navbar-text {
    color: #2E8B57;
}

.custom-toggler.navbar-toggler {
    border-color: rgb(46,139,87);
}
.custom-toggler .navbar-toggler-icon {
  background-image: url("data:image/svg+xml;charset=utf8,%3Csvg viewBox='0 0 32 32' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath stroke='rgba(46, 139, 87, 1)' stroke-width='2' stroke-linecap='round' stroke-miterlimit='10' d='M4 8h24M4 16h24M4 24h24'/%3E%3C/svg%3E");

}

&lt;!DOCTYPE html&gt;
&lt;html lang="de"&gt;

&lt;head&gt;
    &lt;meta charset="UTF-8"&gt;
    &lt;!-- IE Edge Meta Tag --&gt;
    &lt;meta http-equiv="X-UA-Compatible" content="IE=edge"&gt;
    &lt;!-- Viewport --&gt;
    &lt;meta name="viewport" content="width=device-width, initial-scale=1"&gt;
    &lt;meta http-equiv="x-ua-compatible" content="ie=edge"&gt;
    &lt;!-- Minified CSS --&gt;
    &lt;link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/css/bootstrap.min.css" integrity="sha384-rwoIResjU2yc3z8GV/NPeZWAv56rSmLldC3R/AZzGRnGxQQKnKkoFVhFQhNUwEyJ"
        crossorigin="anonymous"&gt;
    &lt;link rel="stylesheet" href="ergo.css"&gt;
    &lt;title&gt;Bettina Klinkicht Ergotherapeutische Praxis Bonn&lt;/title&gt;
    &lt;link rel="shortcut icon" type="image/x-icon" class="img-circle" href="logopur.png"&gt;
    &lt;!-- Global Site Tag (gtag.js) - Google Analytics --&gt;
    &lt;script async src="https://www.googletagmanager.com/gtag/js?id=UA-107069424-1"&gt;&lt;/script&gt;
    &lt;script&gt;
        window.dataLayer = window.dataLayer || [];
        function gtag() { dataLayer.push(arguments) };
        gtag('js', new Date());

        gtag('config', 'UA-107069424-1');
    &lt;/script&gt;
&lt;/head&gt;
&lt;body&gt;
 &lt;nav class="navbar navbar-inverse fixed-top transparent navbar-toggleable-sm navbar-custom"&gt;
        &lt;div class="navbar-inner"&gt;
            &lt;!-- Brand and toggle grouped for better mobile display --&gt;
            &lt;button class="navbar-toggler navbar-toggler-right custom-toggler" type="button" data-toggle="collapse" data-target="#navmobile"
                aria-controls="navmobile" aria-expanded="false" aria-label="Toggle Navigation"&gt;
        &lt;span class="navbar-toggler-icon"&gt;&lt;/span&gt;
    &lt;/button&gt;

            &lt;a href="home.html" class="navbar-brand"&gt;&lt;img src="logopur_neu.png" alt="Logo" id="logonav"&gt;&lt;/a&gt;
        &lt;/div&gt;
        &lt;!-- Collect nav-links for toggling--&gt;
        &lt;div class="collapse navbar-collapse" id="navmobile"&gt;
            &lt;div class="navbar-nav ml-auto"&gt;
                &lt;a class="nav-item nav-link active" href="#"&gt;Home&lt;/a&gt;
                &lt;a class="nav-item nav-link" href="Therapeutin.html"&gt;Über mich&lt;/a&gt;

                &lt;div class="dropdown"&gt;
                    &lt;a class="nav-item nav-link dropdown-toggle" href="#" data-toggle="dropdown" id="servicesDropdown" aria-haspopup="true" aria-expanded="false"&gt;Angebot&lt;/a&gt;
                    &lt;div class="dropdown-menu" aria-labelledby="servicesDropdown"&gt;
                        &lt;a class="dropdown-item" href="Geriatrie.html"&gt;Geriatrie&lt;/a&gt;
                        &lt;a class="dropdown-item" href="Neurologie.html"&gt;Neurologie&lt;/a&gt;
                        &lt;a class="dropdown-item" href="Spiegeltherapie.html"&gt;Spiegeltherapie&lt;/a&gt;
                        &lt;a class="dropdown-item" href="Schwindeltherapie.html"&gt;Schwindeltherapie&lt;/a&gt;
                        &lt;a class="dropdown-item" href="Biographiearbeit.html"&gt;Biographiearbeit&lt;/a&gt;
                        &lt;a class="dropdown-item" href="Brain_Gym.html"&gt;Brain Gym&lt;/a&gt;
                        &lt;a class="dropdown-item" href="Sensibilitaetstraining.html"&gt;Sensibilitätstraining&lt;/a&gt;
                        &lt;a class="dropdown-item" href="Gleichgewichtstraining.html"&gt;Gleichgewichtstraining&lt;/a&gt;
                    &lt;/div&gt;
                &lt;/div&gt;

                &lt;a class="nav-item nav-link" href="Kontakt.html"&gt;Kontakt&lt;/a&gt;
            &lt;/div&gt;
        &lt;/div&gt;
        &lt;/div&gt;
        &lt;/div&gt;
    &lt;/nav&gt;
        &lt;script src="https://code.jquery.com/jquery-3.1.1.slim.min.js" integrity="sha384-A7FZj7v+d/sdmMqp/nOQwliLvUsJfDHW+k9Omg/a/EheAdgtzNs3hpfag6Ed950n"
        crossorigin="anonymous"&gt;&lt;/script&gt;
    &lt;script src="https://cdnjs.cloudflare.com/ajax/libs/tether/1.4.0/js/tether.min.js" integrity="sha384-DztdAPBWPRXSA/3eYEEUWrWCy7G5KFbe8fFjk5JAIxUYHKkDx6Qin1DkWx51bBrb"
        crossorigin="anonymous"&gt;&lt;/script&gt;
    &lt;script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/js/bootstrap.min.js" integrity="sha384-vBWWzlZJ8ea9aCX4pEW3rVHjgjt7zpkNpZk+02D9phzyeVkE+jo0ieGizqPLForn"
        crossorigin="anonymous"&gt;&lt;/script&gt;
    &lt;script src="ergo.js"&gt;&lt;/script&gt;
&lt;/body&gt;
&lt;/html&gt;
</code></pre>


