Hello!
When I insert <button> to navbar-nav - all works fine. But when I try to insert <a class="btn btn-default navbar-btn"> - I see too big button.
Please fix this bug in the next release of the best web UI framework!
<!-- Fixed navbar -->
<header class="navbar navbar-default navbar-fixed-top" role="banner">
<!-- <div class="navbar navbar-default navbar-fixed-top"> -->
<div class="container">
<div class="navbar-header">
<button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".top_menu.navbar-collapse">
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="/">SITE.com</a>
</div>
<div class="top_menu collapse navbar-collapse">
<ul class="nav navbar-nav navbar-right">
<li><a class="btn btn-success navbar-btn">Sign in 2</a></li>
<li><a href="/register">Registration</a></li>
<li><button type="button" class="btn btn-success navbar-btn">Sign in</button></li>
</ul>
</div><!--/.nav-collapse -->
</div>
<!-- </div> -->
</header>
Sign in - looks good.
Sign in 2 - looks bad :-(

Thanks.
Anton
We've covered this quite a lot鈥攄on't apply button classes to navbars. We don't support that.
Guys, I am sorry, but it's not natural approach - it's hack. Why I can't use button link in navbar? I need to have link that follow me to login page. and this should be displayed as button. If it isn't work yet - you can fix it. But it's not good to say "somewhere we described that <A> can't be a button". I showed real example when I need to use link instead of button.
I understand that maybe it's hard to implement button styles in navbar. But it's flexibility - you can implement as more freedom for developers as you can.
I deleted class navbar-btn for link - but my buttons shown not good. Please see attachment (as before - "Sign in 2").

Just FYI, I think a.navbar-btn works just fine outside of navbar-nav lists.
@juthilo You are correct. If I place <a class="btn btn-success navbar-btn">Sign in 2</a> outside the navbar-nav than button shown correct. The issue only with button that placed inside navbar-nav.
I just read: "don't apply button classes to navbars. We don't support that"....... but <button class"nav-btn"> should work and supported ?
(@juthilo) In this case will it be wrong to add a button in stead of <a class="btn btn-success navbar-btn"> inside the navbar-nav, like:
<ul class="nav navbar-nav navbar-right">
<li><a href="#">Link</a></li>
<li><button type="button" class="btn btn-default navbar-btn">Sign in</button></li>
</ul>
When doing this the button don't getting the same padding as an anchor, see:

Same question for button-group
<ul class="nav navbar-nav navbar-right">
<li>
<div class="btn-group">
<button type="button" class="btn btn-default dropdown-toggle navbar-btn" data-toggle="dropdown">
Dropdown
<span class="caret"></span>
</button>
<ul class="dropdown-menu">
<li><a href="#">Dropdown link</a></li>
<li><a href="#">Dropdown link</a></li>
</ul>
</div>
</li>
</ul>
Inside the navbar-nav the carret don't have the right style. Before @grid-float-breaking the dropdown also acts different when inside or outside the navbar-nav.
Inside the navbar-nav:

Outside:

I just ran across this issue. Pretty disappointing it's a continued issue that won't be addressed. If you want a button that has an href you use an anchor with the appropriate styles I don't see any reason why this wouldn't be addressed (and if there is a good reason it's certainly not communicated well at all nor with the proper way to do so).
Here is a workaround for people searching for a navbar button that works like a href:
<form action="logout"><button class="navbar-btn btn btn-default" href="logout">Logout</button></form>
Hack : <a> is not valid, but you can use <button> with onclick()
<button onclick="javascript:location.href='https://www.exemple.com';">
Most helpful comment
Here is a workaround for people searching for a navbar button that works like a href:
<form action="logout"><button class="navbar-btn btn btn-default" href="logout">Logout</button></form>