Bootstrap 4 Navbar-toggler-icon Does Not Appear


Answer :

Update:

navbar-inverse is no longer available in B4 version, you can use navbar-dark instead.

Use navbar-inverse bg-inverse instead of .navbar-default

<section role="navigation">   <nav class="navbar navbar-inverse bg-inverse navbar-toggleable-sm fixed-top"><!-- navbar-inverse -->      <div class="container">        <button class="navbar-toggler navbar-toggler-right" type="button" data-toggle="collapse" data-target="#myNavigation" aria-controls="myNavigation" aria-expanded="false" aria-label="Toggle navigation">       <span class="navbar-toggler-icon"></span>       </button>        <a href="#" class="navbar-brand">KP</a>        <div class="collapse navbar-collapse" id="myNavigation">           <div class="navbar-nav">             <a class="p-3 nav-item nav-link active " href="#">Home</a>             <a class="p-3 nav-item nav-link " href="#">About</a>             <a class="p-3 nav-item nav-link " href="#">Contact Me</a>           </div><!-- <div class="navbar-nav"> -->       </div><!-- <div class="collapse navbar-collapse"> -->      </div><!-- <div class="container"> -->    </nav> </section>

Updated fiddle


If you use bootstrap 4 beta:

You can only add the navbar-dark classe in the nav tag.

Result:

<nav class = "navbar navbar-expand-lg navbar-dark fixed-top navbar-default" role = "navigation">      <a class="navbar-brand" href="#">          <img class = "img-responsive logo" src = "~/Content/Images/ogo__160x36.png" alt = "" />      </a>      <button type = "button" class = "navbar-toggler" data-toggle = "collapse" data-target = "#menuPrincipal" aria-controls = "navbarNav" aria-expanded = "false" aria-label = "Toggle navigation ">          <span class = "navbar-toggler-icon"> </ span>      </button>      <div class="collapse navbar-collapse" ...>...</div> </nav>

if you don't use navbar-light or dark set background-img some image into .navbar-toggler-icon as follow 

.navbar-toggler-icon { background-image: url(data:image/svg+xml,%3csvg viewBox='0 0 30 30' xmlns='http://www.w3.org/2000…p='round' stroke-miterlimit='10' d='M47h22M4 15h22M423h22'/%3e%3c/svg%3e); }

or use fa-bars from font awsome


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