Merge branch 'v4-dev' into dropdown-keyboard

dist/css/bootstrap.css

@@ -2831,6 +2831,10 @@ tbody.collapse.show {
   border-left: 0.3em solid transparent;
 }
 
+.dropdown-toggle:empty::after {
+  margin-left: 0;
+}
+
 .dropup .dropdown-toggle::after {
   border-top: 0;
   border-bottom: 0.3em solid;
@@ -2867,7 +2871,7 @@ tbody.collapse.show {
 .dropdown-item {
   display: block;
   width: 100%;
-  padding: 3px 1.5rem;
+  padding: 0.25rem 1.5rem;
   clear: both;
   font-weight: normal;
   color: #292b2c;
@@ -3036,11 +3040,6 @@ tbody.collapse.show {
   border-bottom-left-radius: 0;
 }
 
-.btn-group .dropdown-toggle:active,
-.btn-group.open .dropdown-toggle {
-  outline: 0;
-}
-
 .btn + .dropdown-toggle-split {
   padding-right: 0.75rem;
   padding-left: 0.75rem;
@@ -3517,15 +3516,10 @@ tbody.collapse.show {
   border-bottom: 1px solid #ddd;
 }
 
-.nav-tabs .nav-item,
-.nav-tabs .nav-link {
+.nav-tabs .nav-item {
   margin-bottom: -1px;
 }
 
-.nav-tabs .nav-item .nav-link {
-  margin-bottom: 0;
-}
-
 .nav-tabs .nav-link {
   border: 1px solid transparent;
   border-top-left-radius: 0.25rem;
@@ -4023,9 +4017,9 @@ tbody.collapse.show {
   color: rgba(0, 0, 0, 0.3);
 }
 
-.navbar-light .navbar-nav .open > .nav-link,
+.navbar-light .navbar-nav .show > .nav-link,
 .navbar-light .navbar-nav .active > .nav-link,
-.navbar-light .navbar-nav .nav-link.open,
+.navbar-light .navbar-nav .nav-link.show,
 .navbar-light .navbar-nav .nav-link.active {
   color: rgba(0, 0, 0, 0.9);
 }
@@ -4063,9 +4057,9 @@ tbody.collapse.show {
   color: rgba(255, 255, 255, 0.25);
 }
 
-.navbar-inverse .navbar-nav .open > .nav-link,
+.navbar-inverse .navbar-nav .show > .nav-link,
 .navbar-inverse .navbar-nav .active > .nav-link,
-.navbar-inverse .navbar-nav .nav-link.open,
+.navbar-inverse .navbar-nav .nav-link.show,
 .navbar-inverse .navbar-nav .nav-link.active {
   color: white;
 }
@@ -4226,31 +4220,67 @@ tbody.collapse.show {
   border-color: #0275d8;
 }
 
+.card-outline-primary .card-header,
+.card-outline-primary .card-footer {
+  background-color: transparent;
+  border-color: #0275d8;
+}
+
 .card-outline-secondary {
   background-color: transparent;
   border-color: #ccc;
 }
 
+.card-outline-secondary .card-header,
+.card-outline-secondary .card-footer {
+  background-color: transparent;
+  border-color: #ccc;
+}
+
 .card-outline-info {
   background-color: transparent;
   border-color: #5bc0de;
 }
 
+.card-outline-info .card-header,
+.card-outline-info .card-footer {
+  background-color: transparent;
+  border-color: #5bc0de;
+}
+
 .card-outline-success {
   background-color: transparent;
   border-color: #5cb85c;
 }
 
+.card-outline-success .card-header,
+.card-outline-success .card-footer {
+  background-color: transparent;
+  border-color: #5cb85c;
+}
+
 .card-outline-warning {
   background-color: transparent;
   border-color: #f0ad4e;
 }
 
+.card-outline-warning .card-header,
+.card-outline-warning .card-footer {
+  background-color: transparent;
+  border-color: #f0ad4e;
+}
+
 .card-outline-danger {
   background-color: transparent;
   border-color: #d9534f;
 }
 
+.card-outline-danger .card-header,
+.card-outline-danger .card-footer {
+  background-color: transparent;
+  border-color: #d9534f;
+}
+
 .card-inverse {
   color: rgba(255, 255, 255, 0.65);
 }
@@ -4395,6 +4425,10 @@ tbody.collapse.show {
   }
 }
 
+.card-columns .card {
+  margin-bottom: 0.75rem;
+}
+
 @media (min-width: 576px) {
   .card-columns {
     -webkit-column-count: 3;
@@ -4407,7 +4441,6 @@ tbody.collapse.show {
   .card-columns .card {
     display: inline-block;
     width: 100%;
-    margin-bottom: 0.75rem;
   }
 }
 
@@ -4627,10 +4660,6 @@ a.badge:focus, a.badge:hover {
   }
 }
 
-.jumbotron-hr {
-  border-top-color: #d0d5d8;
-}
-
 .jumbotron-fluid {
   padding-right: 0;
   padding-left: 0;
@@ -4761,6 +4790,9 @@ a.badge:focus, a.badge:hover {
   line-height: 1rem;
   color: #fff;
   background-color: #0275d8;
+  -webkit-transition: width 0.6s ease;
+  -o-transition: width 0.6s ease;
+  transition: width 0.6s ease;
 }
 
 .progress-bar-striped {
@@ -5479,35 +5511,20 @@ button.close {
 .carousel-item {
   position: relative;
   display: none;
+  -webkit-box-align: center;
+  -webkit-align-items: center;
+      -ms-flex-align: center;
+          align-items: center;
   width: 100%;
-}
-
-@media (-webkit-transform-3d) {
-  .carousel-item {
-    -webkit-transition: -webkit-transform 0.6s ease-in-out;
-    transition: -webkit-transform 0.6s ease-in-out;
-    -o-transition: -o-transform 0.6s ease-in-out;
-    transition: transform 0.6s ease-in-out;
-    transition: transform 0.6s ease-in-out, -webkit-transform 0.6s ease-in-out, -o-transform 0.6s ease-in-out;
-    -webkit-backface-visibility: hidden;
-            backface-visibility: hidden;
-    -webkit-perspective: 1000px;
-            perspective: 1000px;
-  }
-}
-
-@supports ((-webkit-transform: translate3d(0, 0, 0)) or (transform: translate3d(0, 0, 0))) {
-  .carousel-item {
-    -webkit-transition: -webkit-transform 0.6s ease-in-out;
-    transition: -webkit-transform 0.6s ease-in-out;
-    -o-transition: -o-transform 0.6s ease-in-out;
-    transition: transform 0.6s ease-in-out;
-    transition: transform 0.6s ease-in-out, -webkit-transform 0.6s ease-in-out, -o-transform 0.6s ease-in-out;
-    -webkit-backface-visibility: hidden;
-            backface-visibility: hidden;
-    -webkit-perspective: 1000px;
-            perspective: 1000px;
-  }
+  -webkit-transition: -webkit-transform 0.6s ease;
+  transition: -webkit-transform 0.6s ease;
+  -o-transition: -o-transform 0.6s ease;
+  transition: transform 0.6s ease;
+  transition: transform 0.6s ease, -webkit-transform 0.6s ease, -o-transform 0.6s ease;
+  -webkit-backface-visibility: hidden;
+          backface-visibility: hidden;
+  -webkit-perspective: 1000px;
+          perspective: 1000px;
 }
 
 .carousel-item.active,
@@ -5525,40 +5542,22 @@ button.close {
   top: 0;
 }
 
-@media (-webkit-transform-3d) {
-  .carousel-item-next.carousel-item-left,
-  .carousel-item-prev.carousel-item-right {
-    -webkit-transform: translate3d(0, 0, 0);
-            transform: translate3d(0, 0, 0);
-  }
-  .carousel-item-next,
-  .active.carousel-item-right {
-    -webkit-transform: translate3d(100%, 0, 0);
-            transform: translate3d(100%, 0, 0);
-  }
-  .carousel-item-prev,
-  .active.carousel-item-left {
-    -webkit-transform: translate3d(-100%, 0, 0);
-            transform: translate3d(-100%, 0, 0);
-  }
+.carousel-item-next.carousel-item-left,
+.carousel-item-prev.carousel-item-right {
+  -webkit-transform: translate3d(0, 0, 0);
+          transform: translate3d(0, 0, 0);
 }
 
-@supports ((-webkit-transform: translate3d(0, 0, 0)) or (transform: translate3d(0, 0, 0))) {
-  .carousel-item-next.carousel-item-left,
-  .carousel-item-prev.carousel-item-right {
-    -webkit-transform: translate3d(0, 0, 0);
-            transform: translate3d(0, 0, 0);
-  }
-  .carousel-item-next,
-  .active.carousel-item-right {
-    -webkit-transform: translate3d(100%, 0, 0);
-            transform: translate3d(100%, 0, 0);
-  }
-  .carousel-item-prev,
-  .active.carousel-item-left {
-    -webkit-transform: translate3d(-100%, 0, 0);
-            transform: translate3d(-100%, 0, 0);
-  }
+.carousel-item-next,
+.active.carousel-item-right {
+  -webkit-transform: translate3d(100%, 0, 0);
+          transform: translate3d(100%, 0, 0);
+}
+
+.carousel-item-prev,
+.active.carousel-item-left {
+  -webkit-transform: translate3d(-100%, 0, 0);
+          transform: translate3d(-100%, 0, 0);
 }
 
 .carousel-control-prev,

docs/components/button-group.md

@@ -59,7 +59,7 @@ Feel free to mix input groups with button groups in your toolbars. Similar to th
   </div>
   <div class="input-group">
     <span class="input-group-addon" id="btnGroupAddon">@</span>
-    <input type="text" class="form-control" placeholder="Input group example" aria-describedby="btnGroupAddon">
+    <input type="text" class="form-control" placeholder="Input group example" aria-label="Input group example" aria-describedby="btnGroupAddon">
   </div>
 </div>
 
@@ -72,7 +72,7 @@ Feel free to mix input groups with button groups in your toolbars. Similar to th
   </div>
   <div class="input-group">
     <span class="input-group-addon" id="btnGroupAddon2">@</span>
-    <input type="text" class="form-control" placeholder="Input group example" aria-describedby="btnGroupAddon2">
+    <input type="text" class="form-control" placeholder="Input group example" aria-label="Input group example" aria-describedby="btnGroupAddon2">
   </div>
 </div>
 {% endexample %}

docs/components/carousel.md

@@ -30,13 +30,13 @@ Here's a carousel with slides only. Note the presence of the `.d-block` and `.im
 <div id="carouselExampleSlidesOnly" class="carousel slide" data-ride="carousel">
   <div class="carousel-inner" role="listbox">
     <div class="carousel-item active">
-      <img class="d-block img-fluid" data-src="holder.js/800x400?auto=yes&bg=777&fg=555&text=First slide" alt="First slide">
+      <img class="d-block w-100" data-src="holder.js/800x400?auto=yes&bg=777&fg=555&text=First slide" alt="First slide">
     </div>
     <div class="carousel-item">
-      <img class="d-block img-fluid" data-src="holder.js/800x400?auto=yes&bg=666&fg=444&text=Second slide" alt="Second slide">
+      <img class="d-block w-100" data-src="holder.js/800x400?auto=yes&bg=666&fg=444&text=Second slide" alt="Second slide">
     </div>
     <div class="carousel-item">
-      <img class="d-block img-fluid" data-src="holder.js/800x400?auto=yes&bg=555&fg=333&text=Third slide" alt="Third slide">
+      <img class="d-block w-100" data-src="holder.js/800x400?auto=yes&bg=555&fg=333&text=Third slide" alt="Third slide">
     </div>
   </div>
 </div>
@@ -50,13 +50,13 @@ Adding in the previous and next controls:
 <div id="carouselExampleControls" class="carousel slide" data-ride="carousel">
   <div class="carousel-inner" role="listbox">
     <div class="carousel-item active">
-      <img class="d-block img-fluid" data-src="holder.js/800x400?auto=yes&bg=777&fg=555&text=First slide" alt="First slide">
+      <img class="d-block w-100" data-src="holder.js/800x400?auto=yes&bg=777&fg=555&text=First slide" alt="First slide">
     </div>
     <div class="carousel-item">
-      <img class="d-block img-fluid" data-src="holder.js/800x400?auto=yes&bg=666&fg=444&text=Second slide" alt="Second slide">
+      <img class="d-block w-100" data-src="holder.js/800x400?auto=yes&bg=666&fg=444&text=Second slide" alt="Second slide">
     </div>
     <div class="carousel-item">
-      <img class="d-block img-fluid" data-src="holder.js/800x400?auto=yes&bg=555&fg=333&text=Third slide" alt="Third slide">
+      <img class="d-block w-100" data-src="holder.js/800x400?auto=yes&bg=555&fg=333&text=Third slide" alt="Third slide">
     </div>
   </div>
   <a class="carousel-control-prev" href="#carouselExampleControls" role="button" data-slide="prev">
@@ -83,13 +83,13 @@ You can also add the indicators to the carousel, alongside the controls, too.
   </ol>
   <div class="carousel-inner" role="listbox">
     <div class="carousel-item active">
-      <img class="d-block img-fluid" data-src="holder.js/800x400?auto=yes&bg=777&fg=555&text=First slide" alt="First slide">
+      <img class="d-block w-100" data-src="holder.js/800x400?auto=yes&bg=777&fg=555&text=First slide" alt="First slide">
     </div>
     <div class="carousel-item">
-      <img class="d-block img-fluid" data-src="holder.js/800x400?auto=yes&bg=666&fg=444&text=Second slide" alt="Second slide">
+      <img class="d-block w-100" data-src="holder.js/800x400?auto=yes&bg=666&fg=444&text=Second slide" alt="Second slide">
     </div>
     <div class="carousel-item">
-      <img class="d-block img-fluid" data-src="holder.js/800x400?auto=yes&bg=555&fg=333&text=Third slide" alt="Third slide">
+      <img class="d-block w-100" data-src="holder.js/800x400?auto=yes&bg=555&fg=333&text=Third slide" alt="Third slide">
     </div>
   </div>
   <a class="carousel-control-prev" href="#carouselExampleIndicators" role="button" data-slide="prev">
@@ -122,21 +122,21 @@ Add captions to your slides easily with the `.carousel-caption` element within a
     </ol>
     <div class="carousel-inner" role="listbox">
       <div class="carousel-item active">
-        <img class="d-block img-fluid" data-src="holder.js/800x400?auto=yes&bg=777&fg=555&text=First slide" alt="First slide">
+        <img class="d-block w-100" data-src="holder.js/800x400?auto=yes&bg=777&fg=555&text=First slide" alt="First slide">
         <div class="carousel-caption d-none d-md-block">
           <h3>First slide label</h3>
           <p>Nulla vitae elit libero, a pharetra augue mollis interdum.</p>
         </div>
       </div>
       <div class="carousel-item">
-        <img class="d-block img-fluid" data-src="holder.js/800x400?auto=yes&bg=666&fg=444&text=Second slide" alt="Second slide">
+        <img class="d-block w-100" data-src="holder.js/800x400?auto=yes&bg=666&fg=444&text=Second slide" alt="Second slide">
         <div class="carousel-caption d-none d-md-block">
           <h3>Second slide label</h3>
           <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit.</p>
         </div>
       </div>
       <div class="carousel-item">
-        <img class="d-block img-fluid" data-src="holder.js/800x400?auto=yes&bg=555&fg=333&text=Third slide" alt="Third slide">
+        <img class="d-block w-100" data-src="holder.js/800x400?auto=yes&bg=555&fg=333&text=Third slide" alt="Third slide">
         <div class="carousel-caption d-none d-md-block">
           <h3>Third slide label</h3>
           <p>Praesent commodo cursus magna, vel scelerisque nisl consectetur.</p>

docs/components/input-group.md

@@ -19,11 +19,11 @@ Place one add-on or button on either side of an input. You may also place one on
 {% example html %}
 <div class="input-group">
   <span class="input-group-addon" id="basic-addon1">@</span>
-  <input type="text" class="form-control" placeholder="Username" aria-describedby="basic-addon1">
+  <input type="text" class="form-control" placeholder="Username" aria-label="Username" aria-describedby="basic-addon1">
 </div>
 <br>
 <div class="input-group">
-  <input type="text" class="form-control" placeholder="Recipient's username" aria-describedby="basic-addon2">
+  <input type="text" class="form-control" placeholder="Recipient's username" aria-label="Recipient's username" aria-describedby="basic-addon2">
   <span class="input-group-addon" id="basic-addon2">@example.com</span>
 </div>
 <br>
@@ -53,12 +53,12 @@ Add the relative form sizing classes to the `.input-group` itself and contents w
 {% example html %}
 <div class="input-group input-group-lg">
   <span class="input-group-addon" id="sizing-addon1">@</span>
-  <input type="text" class="form-control" placeholder="Username" aria-describedby="sizing-addon1">
+  <input type="text" class="form-control" placeholder="Username" aria-label="Username" aria-describedby="sizing-addon1">
 </div>
 <br>
 <div class="input-group">
   <span class="input-group-addon" id="sizing-addon2">@</span>
-  <input type="text" class="form-control" placeholder="Username" aria-describedby="sizing-addon2">
+  <input type="text" class="form-control" placeholder="Username" aria-label="Username" aria-describedby="sizing-addon2">
 </div>
 {% endexample %}
 
@@ -124,12 +124,12 @@ Buttons in input groups must wrapped in a `.input-group-btn` for proper alignmen
       <span class="input-group-btn">
         <button class="btn btn-secondary" type="button">Go!</button>
       </span>
-      <input type="text" class="form-control" placeholder="Search for...">
+      <input type="text" class="form-control" placeholder="Search for..." aria-label="Search for...">
     </div>
   </div>
   <div class="col-lg-6">
     <div class="input-group">
-      <input type="text" class="form-control" placeholder="Search for...">
+      <input type="text" class="form-control" placeholder="Search for..." aria-label="Search for...>
       <span class="input-group-btn">
         <button class="btn btn-secondary" type="button">Go!</button>
       </span>
@@ -143,7 +143,7 @@ Buttons in input groups must wrapped in a `.input-group-btn` for proper alignmen
       <span class="input-group-btn">
         <button class="btn btn-secondary" type="button">Hate it</button>
       </span>
-      <input type="text" class="form-control" placeholder="Product name">
+      <input type="text" class="form-control" placeholder="Product name" aria-label="Product name">
       <span class="input-group-btn">
         <button class="btn btn-secondary" type="button">Love it</button>
       </span>
@@ -240,4 +240,4 @@ Buttons in input groups must wrapped in a `.input-group-btn` for proper alignmen
 
 Screen readers will have trouble with your forms if you don't include a label for every input. For these input groups, ensure that any additional label or functionality is conveyed to assistive technologies.
 
-The exact technique to be used (`<label>` elements hidden using the `.sr-only` class, or use of the `aria-label`, `aria-labelledby`, `aria-describedby`, `title` or `placeholder` attribute) and what additional information will need to be conveyed will vary depending on the exact type of interface widget you're implementing. The examples in this section provide a few suggested, case-specific approaches.
+The exact technique to be used (`<label>` elements hidden using the `.sr-only` class, or use of the `aria-label` and `aria-labelledby` attributes, possibly in combination with `aria-describedby`) and what additional information will need to be conveyed will vary depending on the exact type of interface widget you're implementing. The examples in this section provide a few suggested, case-specific approaches.

docs/components/navbar.md

@@ -57,7 +57,7 @@ Here's an example of all the sub-components included in a responsive light-theme
       </li>
     </ul>
     <form class="form-inline my-2 my-lg-0">
-      <input class="form-control mr-sm-2" type="text" placeholder="Search">
+      <input class="form-control mr-sm-2" type="text" placeholder="Search" aria-label="Search">
       <button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
     </form>
   </div>
@@ -192,7 +192,7 @@ Place various form controls and components within a navbar with `.form-inline`.
 {% example html %}
 <nav class="navbar navbar-light bg-faded">
   <form class="form-inline">
-    <input class="form-control mr-sm-2" type="text" placeholder="Search">
+    <input class="form-control mr-sm-2" type="text" placeholder="Search" aria-label="Search">
     <button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
   </form>
 </nav>
@@ -204,7 +204,7 @@ Align the contents of your inline forms with utilities as needed.
 <nav class="navbar navbar-light bg-faded justify-content-between">
   <a class="navbar-brand">Navbar</a>
   <form class="form-inline">
-    <input class="form-control mr-sm-2" type="text" placeholder="Search">
+    <input class="form-control mr-sm-2" type="text" placeholder="Search" aria-label="Search">
     <button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
   </form>
 </nav>
@@ -217,7 +217,7 @@ Input groups work, too:
   <form class="form-inline">
     <div class="input-group">
       <span class="input-group-addon" id="basic-addon1">@</span>
-      <input type="text" class="form-control" placeholder="Username" aria-describedby="basic-addon1">
+      <input type="text" class="form-control" placeholder="Username" aria-label="Username" aria-describedby="basic-addon1">
     </div>
   </form>
 </nav>
@@ -300,7 +300,7 @@ Theming the navbar has never been easier thanks to the combination of theming cl
         </li>
       </ul>
       <form class="form-inline">
-        <input class="form-control mr-sm-2" type="text" placeholder="Search">
+        <input class="form-control mr-sm-2" type="text" placeholder="Search" aria-label="Search">
         <button class="btn btn-outline-info my-2 my-sm-0" type="submit">Search</button>
       </form>
     </div>
@@ -328,7 +328,7 @@ Theming the navbar has never been easier thanks to the combination of theming cl
         </li>
       </ul>
       <form class="form-inline">
-        <input class="form-control mr-sm-2" type="text" placeholder="Search">
+        <input class="form-control mr-sm-2" type="text" placeholder="Search" aria-label="Search">
         <button class="btn btn-outline-secondary my-2 my-sm-0" type="submit">Search</button>
       </form>
     </div>
@@ -356,7 +356,7 @@ Theming the navbar has never been easier thanks to the combination of theming cl
         </li>
       </ul>
       <form class="form-inline">
-        <input class="form-control mr-sm-2" type="text" placeholder="Search">
+        <input class="form-control mr-sm-2" type="text" placeholder="Search" aria-label="Search">
         <button class="btn btn-outline-primary my-2 my-sm-0" type="submit">Search</button>
       </form>
     </div>
@@ -458,7 +458,7 @@ With no `.navbar-brand` shown in lowest breakpoint:
       </li>
     </ul>
     <form class="form-inline my-2 my-lg-0">
-      <input class="form-control mr-sm-2" type="text" placeholder="Search">
+      <input class="form-control mr-sm-2" type="text" placeholder="Search" aria-label="Search">
       <button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
     </form>
   </div>
@@ -516,7 +516,7 @@ With a toggler on the left and brand name on the right:
       </li>
     </ul>
     <form class="form-inline my-2 my-lg-0">
-      <input class="form-control mr-sm-2" type="text" placeholder="Search">
+      <input class="form-control mr-sm-2" type="text" placeholder="Search" aria-label="Search">
       <button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
     </form>
   </div>

docs/components/navs.md

@@ -295,7 +295,7 @@ Add dropdown menus with a little extra HTML and the [dropdowns JavaScript plugin
 
 Use the tab JavaScript plugin—include it individually or through the compiled `bootstrap.js` file—to extend our navigational tabs and pills to create tabbable panes of local content, even via dropdown menus.
 
-<div class="bd-example bd-example-tabs" role="tabpanel">
+<div class="bd-example bd-example-tabs">
   <ul class="nav nav-tabs" id="myTab" role="tablist">
     <li class="nav-item">
       <a class="nav-link active" id="home-tab" data-toggle="tab" href="#home" role="tab" aria-controls="home" aria-expanded="true">Home</a>
@@ -357,7 +357,7 @@ Use the tab JavaScript plugin—include it individually or through the compiled
 
 To help fit your needs, this works with `<ul>`-based markup, as shown above, as well as `<nav>`-based markup shown below.
 
-<div class="bd-example bd-example-tabs" role="tabpanel">
+<div class="bd-example bd-example-tabs">
   <nav class="nav nav-tabs" id="nav-tab" role="tablist">
     <a class="nav-item nav-link active" id="nav-home-tab" data-toggle="tab" href="#nav-home" role="tab" aria-controls="home" aria-expanded="true">Home</a>
     <a class="nav-item nav-link" id="nav-profile-tab" data-toggle="tab" href="#nav-profile" role="tab" aria-controls="profile">Profile</a>
@@ -411,7 +411,7 @@ To help fit your needs, this works with `<ul>`-based markup, as shown above, as
 
 The tabs plugin also works with pills.
 
-<div class="bd-example bd-example-tabs" role="tabpanel">
+<div class="bd-example bd-example-tabs">
   <ul class="nav nav-pills mb-3" id="pills-tab" role="tablist">
     <li class="nav-item">
       <a class="nav-link active" id="pills-home-tab" data-toggle="pill" href="#pills-home" role="tab" aria-controls="pills-home" aria-expanded="true">Home</a>
@@ -469,7 +469,7 @@ The tabs plugin also works with pills.
 
 And with vertical pills.
 
-<div class="bd-example bd-example-tabs" role="tabpanel">
+<div class="bd-example bd-example-tabs">
   <div class="row">
     <div class="col-3">
       <div class="nav flex-column nav-pills" id="v-pills-tab" role="tablist">
@@ -517,7 +517,6 @@ And with vertical pills.
 
 You can activate a tab or pill navigation without writing any JavaScript by simply specifying `data-toggle="tab"` or `data-toggle="pill"` on an element. Use these data attributes on `.nav-tabs` or `.nav-pills`.
 
-<div role="tabpanel">
 {% highlight html %}
 <!-- Nav tabs -->
 <ul class="nav nav-tabs" id="myTab" role="tablist">
@@ -543,7 +542,6 @@ You can activate a tab or pill navigation without writing any JavaScript by simp
   <div class="tab-pane" id="settings" role="tabpanel">...</div>
 </div>
 {% endhighlight %}
-</div>
 
 ### Via JavaScript
 

docs/dist/css/bootstrap.css

@@ -2831,6 +2831,10 @@ tbody.collapse.show {
   border-left: 0.3em solid transparent;
 }
 
+.dropdown-toggle:empty::after {
+  margin-left: 0;
+}
+
 .dropup .dropdown-toggle::after {
   border-top: 0;
   border-bottom: 0.3em solid;
@@ -2867,7 +2871,7 @@ tbody.collapse.show {
 .dropdown-item {
   display: block;
   width: 100%;
-  padding: 3px 1.5rem;
+  padding: 0.25rem 1.5rem;
   clear: both;
   font-weight: normal;
   color: #292b2c;
@@ -3036,11 +3040,6 @@ tbody.collapse.show {
   border-bottom-left-radius: 0;
 }
 
-.btn-group .dropdown-toggle:active,
-.btn-group.open .dropdown-toggle {
-  outline: 0;
-}
-
 .btn + .dropdown-toggle-split {
   padding-right: 0.75rem;
   padding-left: 0.75rem;
@@ -3517,15 +3516,10 @@ tbody.collapse.show {
   border-bottom: 1px solid #ddd;
 }
 
-.nav-tabs .nav-item,
-.nav-tabs .nav-link {
+.nav-tabs .nav-item {
   margin-bottom: -1px;
 }
 
-.nav-tabs .nav-item .nav-link {
-  margin-bottom: 0;
-}
-
 .nav-tabs .nav-link {
   border: 1px solid transparent;
   border-top-left-radius: 0.25rem;
@@ -4023,9 +4017,9 @@ tbody.collapse.show {
   color: rgba(0, 0, 0, 0.3);
 }
 
-.navbar-light .navbar-nav .open > .nav-link,
+.navbar-light .navbar-nav .show > .nav-link,
 .navbar-light .navbar-nav .active > .nav-link,
-.navbar-light .navbar-nav .nav-link.open,
+.navbar-light .navbar-nav .nav-link.show,
 .navbar-light .navbar-nav .nav-link.active {
   color: rgba(0, 0, 0, 0.9);
 }
@@ -4063,9 +4057,9 @@ tbody.collapse.show {
   color: rgba(255, 255, 255, 0.25);
 }
 
-.navbar-inverse .navbar-nav .open > .nav-link,
+.navbar-inverse .navbar-nav .show > .nav-link,
 .navbar-inverse .navbar-nav .active > .nav-link,
-.navbar-inverse .navbar-nav .nav-link.open,
+.navbar-inverse .navbar-nav .nav-link.show,
 .navbar-inverse .navbar-nav .nav-link.active {
   color: white;
 }
@@ -4226,31 +4220,67 @@ tbody.collapse.show {
   border-color: #0275d8;
 }
 
+.card-outline-primary .card-header,
+.card-outline-primary .card-footer {
+  background-color: transparent;
+  border-color: #0275d8;
+}
+
 .card-outline-secondary {
   background-color: transparent;
   border-color: #ccc;
 }
 
+.card-outline-secondary .card-header,
+.card-outline-secondary .card-footer {
+  background-color: transparent;
+  border-color: #ccc;
+}
+
 .card-outline-info {
   background-color: transparent;
   border-color: #5bc0de;
 }
 
+.card-outline-info .card-header,
+.card-outline-info .card-footer {
+  background-color: transparent;
+  border-color: #5bc0de;
+}
+
 .card-outline-success {
   background-color: transparent;
   border-color: #5cb85c;
 }
 
+.card-outline-success .card-header,
+.card-outline-success .card-footer {
+  background-color: transparent;
+  border-color: #5cb85c;
+}
+
 .card-outline-warning {
   background-color: transparent;
   border-color: #f0ad4e;
 }
 
+.card-outline-warning .card-header,
+.card-outline-warning .card-footer {
+  background-color: transparent;
+  border-color: #f0ad4e;
+}
+
 .card-outline-danger {
   background-color: transparent;
   border-color: #d9534f;
 }
 
+.card-outline-danger .card-header,
+.card-outline-danger .card-footer {
+  background-color: transparent;
+  border-color: #d9534f;
+}
+
 .card-inverse {
   color: rgba(255, 255, 255, 0.65);
 }
@@ -4395,6 +4425,10 @@ tbody.collapse.show {
   }
 }
 
+.card-columns .card {
+  margin-bottom: 0.75rem;
+}
+
 @media (min-width: 576px) {
   .card-columns {
     -webkit-column-count: 3;
@@ -4407,7 +4441,6 @@ tbody.collapse.show {
   .card-columns .card {
     display: inline-block;
     width: 100%;
-    margin-bottom: 0.75rem;
   }
 }
 
@@ -4627,10 +4660,6 @@ a.badge:focus, a.badge:hover {
   }
 }
 
-.jumbotron-hr {
-  border-top-color: #d0d5d8;
-}
-
 .jumbotron-fluid {
   padding-right: 0;
   padding-left: 0;
@@ -4761,6 +4790,9 @@ a.badge:focus, a.badge:hover {
   line-height: 1rem;
   color: #fff;
   background-color: #0275d8;
+  -webkit-transition: width 0.6s ease;
+  -o-transition: width 0.6s ease;
+  transition: width 0.6s ease;
 }
 
 .progress-bar-striped {
@@ -5479,35 +5511,20 @@ button.close {
 .carousel-item {
   position: relative;
   display: none;
+  -webkit-box-align: center;
+  -webkit-align-items: center;
+      -ms-flex-align: center;
+          align-items: center;
   width: 100%;
-}
-
-@media (-webkit-transform-3d) {
-  .carousel-item {
-    -webkit-transition: -webkit-transform 0.6s ease-in-out;
-    transition: -webkit-transform 0.6s ease-in-out;
-    -o-transition: -o-transform 0.6s ease-in-out;
-    transition: transform 0.6s ease-in-out;
-    transition: transform 0.6s ease-in-out, -webkit-transform 0.6s ease-in-out, -o-transform 0.6s ease-in-out;
-    -webkit-backface-visibility: hidden;
-            backface-visibility: hidden;
-    -webkit-perspective: 1000px;
-            perspective: 1000px;
-  }
-}
-
-@supports ((-webkit-transform: translate3d(0, 0, 0)) or (transform: translate3d(0, 0, 0))) {
-  .carousel-item {
-    -webkit-transition: -webkit-transform 0.6s ease-in-out;
-    transition: -webkit-transform 0.6s ease-in-out;
-    -o-transition: -o-transform 0.6s ease-in-out;
-    transition: transform 0.6s ease-in-out;
-    transition: transform 0.6s ease-in-out, -webkit-transform 0.6s ease-in-out, -o-transform 0.6s ease-in-out;
-    -webkit-backface-visibility: hidden;
-            backface-visibility: hidden;
-    -webkit-perspective: 1000px;
-            perspective: 1000px;
-  }
+  -webkit-transition: -webkit-transform 0.6s ease;
+  transition: -webkit-transform 0.6s ease;
+  -o-transition: -o-transform 0.6s ease;
+  transition: transform 0.6s ease;
+  transition: transform 0.6s ease, -webkit-transform 0.6s ease, -o-transform 0.6s ease;
+  -webkit-backface-visibility: hidden;
+          backface-visibility: hidden;
+  -webkit-perspective: 1000px;
+          perspective: 1000px;
 }
 
 .carousel-item.active,
@@ -5525,40 +5542,22 @@ button.close {
   top: 0;
 }
 
-@media (-webkit-transform-3d) {
-  .carousel-item-next.carousel-item-left,
-  .carousel-item-prev.carousel-item-right {
-    -webkit-transform: translate3d(0, 0, 0);
-            transform: translate3d(0, 0, 0);
-  }
-  .carousel-item-next,
-  .active.carousel-item-right {
-    -webkit-transform: translate3d(100%, 0, 0);
-            transform: translate3d(100%, 0, 0);
-  }
-  .carousel-item-prev,
-  .active.carousel-item-left {
-    -webkit-transform: translate3d(-100%, 0, 0);
-            transform: translate3d(-100%, 0, 0);
-  }
+.carousel-item-next.carousel-item-left,
+.carousel-item-prev.carousel-item-right {
+  -webkit-transform: translate3d(0, 0, 0);
+          transform: translate3d(0, 0, 0);
 }
 
-@supports ((-webkit-transform: translate3d(0, 0, 0)) or (transform: translate3d(0, 0, 0))) {
-  .carousel-item-next.carousel-item-left,
-  .carousel-item-prev.carousel-item-right {
-    -webkit-transform: translate3d(0, 0, 0);
-            transform: translate3d(0, 0, 0);
-  }
-  .carousel-item-next,
-  .active.carousel-item-right {
-    -webkit-transform: translate3d(100%, 0, 0);
-            transform: translate3d(100%, 0, 0);
-  }
-  .carousel-item-prev,
-  .active.carousel-item-left {
-    -webkit-transform: translate3d(-100%, 0, 0);
-            transform: translate3d(-100%, 0, 0);
-  }
+.carousel-item-next,
+.active.carousel-item-right {
+  -webkit-transform: translate3d(100%, 0, 0);
+          transform: translate3d(100%, 0, 0);
+}
+
+.carousel-item-prev,
+.active.carousel-item-left {
+  -webkit-transform: translate3d(-100%, 0, 0);
+          transform: translate3d(-100%, 0, 0);
 }
 
 .carousel-control-prev,

docs/examples/carousel/index.html

@@ -35,7 +35,7 @@
           </li>
         </ul>
         <form class="form-inline mt-2 mt-md-0">
-          <input class="form-control mr-sm-2" type="text" placeholder="Search">
+          <input class="form-control mr-sm-2" type="text" placeholder="Search" aria-label="Search">
           <button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
         </form>
       </div>

docs/examples/dashboard/index.html

@@ -39,7 +39,7 @@
           </li>
         </ul>
         <form class="form-inline mt-2 mt-md-0">
-          <input class="form-control mr-sm-2" type="text" placeholder="Search">
+          <input class="form-control mr-sm-2" type="text" placeholder="Search" aria-label="Search">
           <button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
         </form>
       </div>

docs/examples/jumbotron/index.html

@@ -45,7 +45,7 @@
           </li>
         </ul>
         <form class="form-inline my-2 my-lg-0">
-          <input class="form-control mr-sm-2" type="text" placeholder="Search">
+          <input class="form-control mr-sm-2" type="text" placeholder="Search" aria-label="Search">
           <button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
         </form>
       </div>

docs/examples/navbar-top-fixed/index.html

@@ -36,7 +36,7 @@
           </li>
         </ul>
         <form class="form-inline mt-2 mt-md-0">
-          <input class="form-control mr-sm-2" type="text" placeholder="Search">
+          <input class="form-control mr-sm-2" type="text" placeholder="Search" aria-label="Search">
           <button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
         </form>
       </div>

docs/examples/navbar-top/index.html

@@ -36,7 +36,7 @@
           </li>
         </ul>
         <form class="form-inline mt-2 mt-md-0">
-          <input class="form-control mr-sm-2" type="text" placeholder="Search">
+          <input class="form-control mr-sm-2" type="text" placeholder="Search" aria-label="Search">
           <button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
         </form>
       </div>

docs/examples/navbars/index.html

@@ -45,7 +45,7 @@
           </li>
         </ul>
         <form class="form-inline my-2 my-md-0">
-          <input class="form-control" type="text" placeholder="Search">
+          <input class="form-control" type="text" placeholder="Search" aria-label="Search">
         </form>
       </div>
     </nav>
@@ -238,7 +238,7 @@
             </li>
           </ul>
           <form class="form-inline my-2 my-md-0">
-            <input class="form-control" type="text" placeholder="Search">
+            <input class="form-control" type="text" placeholder="Search" aria-label="Search">
           </form>
         </div>
       </div>
@@ -300,7 +300,7 @@
             </li>
           </ul>
           <form class="form-inline my-2 my-md-0">
-            <input class="form-control" type="text" placeholder="Search">
+            <input class="form-control" type="text" placeholder="Search" aria-label="Search">
           </form>
         </div>
       </nav>

docs/examples/offcanvas/index.html

@@ -45,7 +45,7 @@
           </li>
         </ul>
         <form class="form-inline my-2 my-lg-0">
-          <input class="form-control mr-sm-2" type="text" placeholder="Search">
+          <input class="form-control mr-sm-2" type="text" placeholder="Search" aria-label="Search">
           <button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
         </form>
       </div>