diff --git a/docs/_includes/nav-home.html b/docs/_includes/nav-home.html
index 8ba41c7b42..f77f02084d 100644
--- a/docs/_includes/nav-home.html
+++ b/docs/_includes/nav-home.html
@@ -27,7 +27,9 @@
 
     <nav>
       <div class="clearfix">
-        <button class="navbar-toggler float-right hidden-sm-up" type="button" data-toggle="collapse" data-target="#bd-main-nav" aria-controls="bd-main-nav" aria-expanded="false" aria-label="Toggle navigation"></button>
+        <button class="navbar-toggler float-right hidden-sm-up" type="button" data-toggle="collapse" data-target="#bd-main-nav" aria-controls="bd-main-nav" aria-expanded="false" aria-label="Toggle navigation">
+          <span class="navbar-toggler-icon"></span>
+        </button>
         <a class="navbar-brand hidden-sm-up" href="{{ site.baseurl }}/">
           Bootstrap
         </a>
diff --git a/docs/components/navbar.md b/docs/components/navbar.md
index 7d0656d4b3..d1dd333f15 100644
--- a/docs/components/navbar.md
+++ b/docs/components/navbar.md
@@ -40,7 +40,9 @@ Here's an example of all the sub-components included in a responsive light-theme
 
 {% example html %}
 <nav class="navbar navbar-light navbar-toggleable-md bg-faded">
-  <button class="navbar-toggler navbar-toggler-right hidden-lg-up" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation"></button>
+  <button class="navbar-toggler navbar-toggler-right hidden-lg-up" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
+    <span class="navbar-toggler-icon"></span>
+  </button>
   <a class="navbar-brand" href="#">Navbar</a>
 
   <div class="collapse navbar-collapse" id="navbarSupportedContent">
@@ -108,7 +110,9 @@ Active states—with `.active`—to indicate the current page can be applied dir
 
 {% example html %}
 <nav class="navbar navbar-light navbar-toggleable-md bg-faded">
-  <button class="navbar-toggler navbar-toggler-right hidden-lg-up" type="button" data-toggle="collapse" data-target="#navbarNav" aria-controls="navbarNav" aria-expanded="false" aria-label="Toggle navigation"></button>
+  <button class="navbar-toggler navbar-toggler-right hidden-lg-up" type="button" data-toggle="collapse" data-target="#navbarNav" aria-controls="navbarNav" aria-expanded="false" aria-label="Toggle navigation">
+    <span class="navbar-toggler-icon"></span>
+  </button>
   <a class="navbar-brand" href="#">Navbar</a>
   <div class="collapse navbar-collapse" id="navbarNav">
     <ul class="nav navbar-nav">
@@ -133,7 +137,9 @@ And because we use classes for our navs, you can avoid the list-based approach e
 
 {% example html %}
 <nav class="navbar navbar-light navbar-toggleable-md bg-faded">
-  <button class="navbar-toggler navbar-toggler-right hidden-lg-up" type="button" data-toggle="collapse" data-target="#navbarNavAltMarkup" aria-controls="navbarNavAltMarkup" aria-expanded="false" aria-label="Toggle navigation"></button>
+  <button class="navbar-toggler navbar-toggler-right hidden-lg-up" type="button" data-toggle="collapse" data-target="#navbarNavAltMarkup" aria-controls="navbarNavAltMarkup" aria-expanded="false" aria-label="Toggle navigation">
+    <span class="navbar-toggler-icon"></span>
+  </button>
   <a class="navbar-brand" href="#">Navbar</a>
   <div class="collapse navbar-collapse" id="navbarNavAltMarkup">
     <div class="nav navbar-nav">
@@ -150,7 +156,9 @@ You may also utilize dropdowns in your navbar nav. Dropdown menus require a wrap
 
 {% example html %}
 <nav class="navbar navbar-light navbar-toggleable-md bg-faded">
-  <button class="navbar-toggler navbar-toggler-right hidden-lg-up" type="button" data-toggle="collapse" data-target="#navbarNavDropdown" aria-controls="navbarNavDropdown" aria-expanded="false" aria-label="Toggle navigation"></button>
+  <button class="navbar-toggler navbar-toggler-right hidden-lg-up" type="button" data-toggle="collapse" data-target="#navbarNavDropdown" aria-controls="navbarNavDropdown" aria-expanded="false" aria-label="Toggle navigation">
+    <span class="navbar-toggler-icon"></span>
+  </button>
   <a class="navbar-brand" href="#">Navbar</a>
   <div class="collapse navbar-collapse" id="navbarNavDropdown">
     <ul class="nav navbar-nav">
@@ -242,7 +250,9 @@ Mix and match with other components and utilities as needed.
 
 {% example html %}
 <nav class="navbar navbar-light navbar-toggleable-md bg-faded">
-  <button class="navbar-toggler navbar-toggler-right hidden-lg-up" type="button" data-toggle="collapse" data-target="#navbarText" aria-controls="navbarText" aria-expanded="false" aria-label="Toggle navigation"></button>
+  <button class="navbar-toggler navbar-toggler-right hidden-lg-up" type="button" data-toggle="collapse" data-target="#navbarText" aria-controls="navbarText" aria-expanded="false" aria-label="Toggle navigation">
+    <span class="navbar-toggler-icon"></span>
+  </button>
   <a class="navbar-brand" href="#">Navbar w/ text</a>
   <div class="collapse navbar-collapse" id="navbarText">
     <ul class="nav navbar-nav">
@@ -269,7 +279,9 @@ Theming the navbar has never been easier thanks to the combination of theming cl
 
 <div class="bd-example">
   <nav class="navbar navbar-inverse navbar-toggleable-md bg-inverse">
-    <button class="navbar-toggler navbar-toggler-right hidden-lg-up" type="button" data-toggle="collapse" data-target="#navbarColor01" aria-controls="navbarColor01" aria-expanded="false" aria-label="Toggle navigation"></button>
+    <button class="navbar-toggler navbar-toggler-right hidden-lg-up" type="button" data-toggle="collapse" data-target="#navbarColor01" aria-controls="navbarColor01" aria-expanded="false" aria-label="Toggle navigation">
+    <span class="navbar-toggler-icon"></span>
+  </button>
     <a class="navbar-brand" href="#">Navbar</a>
 
     <div class="collapse navbar-collapse" id="navbarColor01">
@@ -295,7 +307,9 @@ Theming the navbar has never been easier thanks to the combination of theming cl
   </nav>
 
   <nav class="navbar navbar-inverse navbar-toggleable-md bg-primary">
-    <button class="navbar-toggler navbar-toggler-right hidden-lg-up" type="button" data-toggle="collapse" data-target="#navbarColor02" aria-controls="navbarColor02" aria-expanded="false" aria-label="Toggle navigation"></button>
+    <button class="navbar-toggler navbar-toggler-right hidden-lg-up" type="button" data-toggle="collapse" data-target="#navbarColor02" aria-controls="navbarColor02" aria-expanded="false" aria-label="Toggle navigation">
+      <span class="navbar-toggler-icon"></span>
+    </button>
     <a class="navbar-brand" href="#">Navbar</a>
 
     <div class="collapse navbar-collapse" id="navbarColor02">
@@ -321,7 +335,9 @@ Theming the navbar has never been easier thanks to the combination of theming cl
   </nav>
 
   <nav class="navbar navbar-light navbar-toggleable-md" style="background-color: #e3f2fd;">
-    <button class="navbar-toggler navbar-toggler-right hidden-lg-up" type="button" data-toggle="collapse" data-target="#navbarColor03" aria-controls="navbarColor03" aria-expanded="false" aria-label="Toggle navigation"></button>
+    <button class="navbar-toggler navbar-toggler-right hidden-lg-up" type="button" data-toggle="collapse" data-target="#navbarColor03" aria-controls="navbarColor03" aria-expanded="false" aria-label="Toggle navigation">
+      <span class="navbar-toggler-icon"></span>
+    </button>
     <a class="navbar-brand" href="#">Navbar</a>
 
     <div class="collapse navbar-collapse" id="navbarColor03">
@@ -417,7 +433,9 @@ With no `.navbar-brand` shown in lowest breakpoint:
 
 {% example html %}
 <nav class="navbar navbar-light navbar-toggleable-md bg-faded">
-  <button class="navbar-toggler hidden-lg-up" type="button" data-toggle="collapse" data-target="#navbarTogglerDemo01" aria-controls="navbarTogglerDemo01" aria-expanded="false" aria-label="Toggle navigation"></button>
+  <button class="navbar-toggler hidden-lg-up" type="button" data-toggle="collapse" data-target="#navbarTogglerDemo01" aria-controls="navbarTogglerDemo01" aria-expanded="false" aria-label="Toggle navigation">
+    <span class="navbar-toggler-icon"></span>
+  </button>
   <div class="collapse navbar-collapse" id="navbarTogglerDemo01">
     <a class="navbar-brand" href="#">Hidden brand</a>
     <ul class="nav navbar-nav mt-2 mt-lg-0">
@@ -443,7 +461,9 @@ With a brand name shown on the left and toggler on the right:
 
 {% example html %}
 <nav class="navbar navbar-light navbar-toggleable-md bg-faded">
-  <button class="navbar-toggler navbar-toggler-right hidden-lg-up" type="button" data-toggle="collapse" data-target="#navbarTogglerDemo02" aria-controls="navbarTogglerDemo02" aria-expanded="false" aria-label="Toggle navigation"></button>
+  <button class="navbar-toggler navbar-toggler-right hidden-lg-up" type="button" data-toggle="collapse" data-target="#navbarTogglerDemo02" aria-controls="navbarTogglerDemo02" aria-expanded="false" aria-label="Toggle navigation">
+    <span class="navbar-toggler-icon"></span>
+  </button>
   <a class="navbar-brand" href="#">Navbar</a>
 
   <div class="collapse navbar-collapse" id="navbarTogglerDemo02">
@@ -479,7 +499,9 @@ Sometimes you want to use the collapse plugin to trigger hidden content elsewher
     </div>
   </div>
   <nav class="navbar navbar-inverse bg-inverse">
-    <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarToggleExternalContent" aria-controls="navbarToggleExternalContent" aria-expanded="false" aria-label="Toggle navigation"></button>
+    <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarToggleExternalContent" aria-controls="navbarToggleExternalContent" aria-expanded="false" aria-label="Toggle navigation">
+      <span class="navbar-toggler-icon"></span>
+    </button>
   </nav>
 </div>
 {% endexample %}
diff --git a/docs/examples/album/index.html b/docs/examples/album/index.html
index 217ee5877c..f2f542257c 100644
--- a/docs/examples/album/index.html
+++ b/docs/examples/album/index.html
@@ -41,7 +41,9 @@
     <div class="navbar navbar-inverse bg-inverse navbar-toggleable-sm">
       <div class="container flex-items-between">
         <a href="#" class="navbar-brand">Album</a>
-        <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarHeader" aria-controls="navbarHeader" aria-expanded="false" aria-label="Toggle navigation"></button>
+        <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarHeader" aria-controls="navbarHeader" aria-expanded="false" aria-label="Toggle navigation">
+          <span class="navbar-toggler-icon"></span>
+        </button>
       </div>
     </div>
 
diff --git a/docs/examples/carousel/index.html b/docs/examples/carousel/index.html
index f591235368..f1e28475f1 100644
--- a/docs/examples/carousel/index.html
+++ b/docs/examples/carousel/index.html
@@ -20,7 +20,9 @@
   <body>
 
     <nav class="navbar navbar-inverse navbar-fixed-top navbar-toggleable-md bg-inverse">
-      <button class="navbar-toggler navbar-toggler-right hidden-lg-up" type="button" data-toggle="collapse" data-target="#navbarCollapse" aria-controls="navbarCollapse" aria-expanded="false" aria-label="Toggle navigation"></button>
+      <button class="navbar-toggler navbar-toggler-right hidden-lg-up" type="button" data-toggle="collapse" data-target="#navbarCollapse" aria-controls="navbarCollapse" aria-expanded="false" aria-label="Toggle navigation">
+        <span class="navbar-toggler-icon"></span>
+      </button>
       <a class="navbar-brand" href="#">Carousel</a>
       <div class="collapse navbar-collapse" id="navbarCollapse">
         <ul class="nav navbar-nav mt-2 mt-lg-0">
diff --git a/docs/examples/dashboard/index.html b/docs/examples/dashboard/index.html
index 96133e61ab..11c85b155d 100644
--- a/docs/examples/dashboard/index.html
+++ b/docs/examples/dashboard/index.html
@@ -20,7 +20,9 @@
 
   <body>
     <nav class="navbar navbar-fixed-top navbar-inverse bg-inverse">
-      <button class="navbar-toggler hidden-md-up" type="button" data-toggle="collapse" data-target="#navbar" aria-controls="navbar" aria-expanded="false" aria-label="Toggle navigation"></button>
+      <button class="navbar-toggler hidden-md-up" type="button" data-toggle="collapse" data-target="#navbar" aria-controls="navbar" aria-expanded="false" aria-label="Toggle navigation">
+        <span class="navbar-toggler-icon"></span>
+      </button>
       <div class="collapse navbar-toggleable-sm" id="navbar">
         <a class="navbar-brand" href="#">Project name</a>
         <ul class="nav navbar-nav float-sm-right">
diff --git a/docs/examples/justified-nav/index.html b/docs/examples/justified-nav/index.html
index 73c4435279..d2aaf17d20 100644
--- a/docs/examples/justified-nav/index.html
+++ b/docs/examples/justified-nav/index.html
@@ -26,7 +26,9 @@
         <h3 class="text-muted">Project name</h3>
 
         <nav class="navbar navbar-light bg-faded rounded mb-3">
-          <button class="navbar-toggler hidden-lg-up" type="button" data-toggle="collapse" data-target="#navbarCollapse" aria-controls="navbarCollapse" aria-expanded="false" aria-label="Toggle navigation"></button>
+          <button class="navbar-toggler hidden-lg-up" type="button" data-toggle="collapse" data-target="#navbarCollapse" aria-controls="navbarCollapse" aria-expanded="false" aria-label="Toggle navigation">
+            <span class="navbar-toggler-icon"></span>
+          </button>
           <div class="collapse navbar-toggleable-md" id="navbarCollapse">
             <ul class="nav navbar-nav text-md-center flex-items-md-between">
               <li class="nav-item active">
diff --git a/docs/examples/navbar-top-fixed/index.html b/docs/examples/navbar-top-fixed/index.html
index c38aaef1b1..6212922833 100644
--- a/docs/examples/navbar-top-fixed/index.html
+++ b/docs/examples/navbar-top-fixed/index.html
@@ -21,7 +21,9 @@
   <body>
 
     <nav class="navbar navbar-inverse navbar-fixed-top navbar-toggleable-md bg-inverse">
-      <button class="navbar-toggler navbar-toggler-right hidden-lg-up" type="button" data-toggle="collapse" data-target="#navbarCollapse" aria-controls="navbarCollapse" aria-expanded="false" aria-label="Toggle navigation"></button>
+      <button class="navbar-toggler navbar-toggler-right hidden-lg-up" type="button" data-toggle="collapse" data-target="#navbarCollapse" aria-controls="navbarCollapse" aria-expanded="false" aria-label="Toggle navigation">
+        <span class="navbar-toggler-icon"></span>
+      </button>
       <a class="navbar-brand" href="#">Fixed navbar</a>
       <div class="collapse navbar-collapse" id="navbarCollapse">
         <ul class="nav navbar-nav mt-2 mt-lg-0">
diff --git a/docs/examples/navbar-top/index.html b/docs/examples/navbar-top/index.html
index 04c03ac218..242b46d5d2 100644
--- a/docs/examples/navbar-top/index.html
+++ b/docs/examples/navbar-top/index.html
@@ -21,7 +21,9 @@
   <body>
 
     <nav class="navbar navbar-inverse navbar-toggleable-md bg-inverse mb-3">
-      <button class="navbar-toggler navbar-toggler-right hidden-lg-up" type="button" data-toggle="collapse" data-target="#navbarCollapse" aria-controls="navbarCollapse" aria-expanded="false" aria-label="Toggle navigation"></button>
+      <button class="navbar-toggler navbar-toggler-right hidden-lg-up" type="button" data-toggle="collapse" data-target="#navbarCollapse" aria-controls="navbarCollapse" aria-expanded="false" aria-label="Toggle navigation">
+        <span class="navbar-toggler-icon"></span>
+      </button>
       <a class="navbar-brand" href="#">Fixed navbar</a>
       <div class="collapse navbar-collapse" id="navbarCollapse">
         <ul class="nav navbar-nav mt-2 mt-lg-0">
diff --git a/docs/examples/navbars/index.html b/docs/examples/navbars/index.html
index 934c2cd033..602b10bb2d 100644
--- a/docs/examples/navbars/index.html
+++ b/docs/examples/navbars/index.html
@@ -21,7 +21,9 @@
   <body>
 
     <nav class="navbar navbar-inverse bg-inverse">
-      <button class="navbar-toggler navbar-toggler-right hidden-lg-up" type="button" data-toggle="collapse" data-target="#navbarsExampleDefault" aria-controls="navbarsExampleDefault" aria-expanded="false" aria-label="Toggle navigation"></button>
+      <button class="navbar-toggler navbar-toggler-right hidden-lg-up" type="button" data-toggle="collapse" data-target="#navbarsExampleDefault" aria-controls="navbarsExampleDefault" aria-expanded="false" aria-label="Toggle navigation">
+        <span class="navbar-toggler-icon"></span>
+      </button>
       <a class="navbar-brand" href="#">Navbar</a>
 
       <div class="collapse navbar-toggleable-md" id="navbarsExampleDefault">
@@ -53,7 +55,9 @@
 
     <nav class="navbar navbar-inverse bg-inverse">
       <div class="container">
-        <button class="navbar-toggler navbar-toggler-right hidden-lg-up" type="button" data-toggle="collapse" data-target="#navbarsExampleContainer" aria-controls="navbarsExampleContainer" aria-expanded="false" aria-label="Toggle navigation"></button>
+        <button class="navbar-toggler navbar-toggler-right hidden-lg-up" type="button" data-toggle="collapse" data-target="#navbarsExampleContainer" aria-controls="navbarsExampleContainer" aria-expanded="false" aria-label="Toggle navigation">
+          <span class="navbar-toggler-icon"></span>
+        </button>
         <a class="navbar-brand" href="#">Container</a>
 
         <div class="collapse navbar-toggleable-md" id="navbarsExampleContainer">
@@ -85,7 +89,9 @@
     </nav>
 
     <nav class="navbar navbar-inverse bg-inverse">
-      <button class="navbar-toggler navbar-toggler-right hidden-lg-up" type="button" data-toggle="collapse" data-target="#navbarsExampleCenteredNav" aria-controls="navbarsExampleCenteredNav" aria-expanded="false" aria-label="Toggle navigation"></button>
+      <button class="navbar-toggler navbar-toggler-right hidden-lg-up" type="button" data-toggle="collapse" data-target="#navbarsExampleCenteredNav" aria-controls="navbarsExampleCenteredNav" aria-expanded="false" aria-label="Toggle navigation">
+        <span class="navbar-toggler-icon"></span>
+      </button>
 
       <div class="collapse navbar-toggleable-md" id="navbarsExampleCenteredNav">
         <ul class="nav navbar-nav text-md-center">
@@ -112,7 +118,9 @@
 
     <div class="container">
       <nav class="navbar navbar-light bg-faded rounded">
-        <button class="navbar-toggler navbar-toggler-right hidden-lg-up" type="button" data-toggle="collapse" data-target="#containerNavbar" aria-controls="containerNavbar" aria-expanded="false" aria-label="Toggle navigation"></button>
+        <button class="navbar-toggler navbar-toggler-right hidden-lg-up" type="button" data-toggle="collapse" data-target="#containerNavbar" aria-controls="containerNavbar" aria-expanded="false" aria-label="Toggle navigation">
+          <span class="navbar-toggler-icon"></span>
+        </button>
         <a class="navbar-brand" href="#">Navbar</a>
 
         <div class="collapse navbar-toggleable-md" id="containerNavbar">
@@ -143,7 +151,9 @@
       </nav>
 
       <nav class="navbar navbar-light bg-faded rounded">
-        <button class="navbar-toggler navbar-toggler-right hidden-lg-up" type="button" data-toggle="collapse" data-target="#containerNavbarCenter" aria-controls="containerNavbarCenter" aria-expanded="false" aria-label="Toggle navigation"></button>
+        <button class="navbar-toggler navbar-toggler-right hidden-lg-up" type="button" data-toggle="collapse" data-target="#containerNavbarCenter" aria-controls="containerNavbarCenter" aria-expanded="false" aria-label="Toggle navigation">
+          <span class="navbar-toggler-icon"></span>
+        </button>
 
         <div class="collapse navbar-toggleable-md" id="containerNavbarCenter">
           <ul class="nav navbar-nav text-md-center">
diff --git a/docs/examples/sticky-footer-navbar/index.html b/docs/examples/sticky-footer-navbar/index.html
index bc2708a505..c15cae2fee 100644
--- a/docs/examples/sticky-footer-navbar/index.html
+++ b/docs/examples/sticky-footer-navbar/index.html
@@ -22,7 +22,9 @@
 
     <!-- Fixed navbar -->
     <nav class="navbar navbar-inverse navbar-fixed-top navbar-toggleable-md bg-inverse">
-      <button class="navbar-toggler navbar-toggler-right hidden-lg-up" type="button" data-toggle="collapse" data-target="#navbarCollapse" aria-controls="navbarCollapse" aria-expanded="false" aria-label="Toggle navigation"></button>
+      <button class="navbar-toggler navbar-toggler-right hidden-lg-up" type="button" data-toggle="collapse" data-target="#navbarCollapse" aria-controls="navbarCollapse" aria-expanded="false" aria-label="Toggle navigation">
+        <span class="navbar-toggler-icon"></span>
+      </button>
       <a class="navbar-brand" href="#">Fixed navbar</a>
       <div class="collapse navbar-collapse" id="navbarCollapse">
         <ul class="nav navbar-nav mt-2 mt-lg-0">