Merge branch 'master' into fix-8869

21 files changed, 543 insertions, 201 deletions

diff --git a/less/.csscomb.json b/less/.csscomb.json
index c3d0c088b..8456e41df 100644
--- a/less/.csscomb.json
+++ b/less/.csscomb.json
@@ -1,7 +1,7 @@
 {
   "always-semicolon": true,
   "block-indent": 2,
-  "colon-space": true,
+  "colon-space": [0, 1],
   "color-case": "lower",
   "color-shorthand": true,
   "combinator-space": true,
@@ -10,7 +10,7 @@
   "leading-zero": false,
   "remove-empty-rulesets": true,
   "rule-indent": 2,
-  "stick-brace": true,
+  "stick-brace": " ",
   "strip-spaces": true,
   "unitless-zero": true,
   "vendor-prefix-align": true,
diff --git a/less/badges.less b/less/badges.less
index 56828cab7..20624f30d 100644
--- a/less/badges.less
+++ b/less/badges.less
@@ -3,7 +3,7 @@
 // --------------------------------------------------
 
 
-// Base classes
+// Base class
 .badge {
   display: inline-block;
   min-width: 10px;
@@ -32,24 +32,24 @@
     top: 0;
     padding: 1px 5px;
   }
-}
 
-// Hover state, but only for links
-a.badge {
-  &:hover,
-  &:focus {
-    color: @badge-link-hover-color;
-    text-decoration: none;
-    cursor: pointer;
+  // Hover state, but only for links
+  a& {
+    &:hover,
+    &:focus {
+      color: @badge-link-hover-color;
+      text-decoration: none;
+      cursor: pointer;
+    }
   }
-}
 
-// Account for counters in navs
-a.list-group-item.active > .badge,
-.nav-pills > .active > a > .badge {
-  color: @badge-active-color;
-  background-color: @badge-active-bg;
-}
-.nav-pills > li > a > .badge {
-  margin-left: 3px;
+  // Account for badges in navs
+  a.list-group-item.active > &,
+  .nav-pills > .active > a > & {
+    color: @badge-active-color;
+    background-color: @badge-active-bg;
+  }
+  .nav-pills > li > a > & {
+    margin-left: 3px;
+  }
 }
diff --git a/less/bootstrap.less b/less/bootstrap.less
index b368b8710..61b77474f 100644
--- a/less/bootstrap.less
+++ b/less/bootstrap.less
@@ -2,9 +2,10 @@
 @import "variables.less";
 @import "mixins.less";
 
-// Reset
+// Reset and dependencies
 @import "normalize.less";
 @import "print.less";
+@import "glyphicons.less";
 
 // Core CSS
 @import "scaffolding.less";
@@ -17,7 +18,6 @@
 
 // Components
 @import "component-animations.less";
-@import "glyphicons.less";
 @import "dropdowns.less";
 @import "button-groups.less";
 @import "input-groups.less";
@@ -35,6 +35,7 @@
 @import "media.less";
 @import "list-group.less";
 @import "panels.less";
+@import "responsive-embed.less";
 @import "wells.less";
 @import "close.less";
 
diff --git a/less/button-groups.less b/less/button-groups.less
index 27eb796b8..ff95b0474 100644
--- a/less/button-groups.less
+++ b/less/button-groups.less
@@ -220,7 +220,17 @@
 
 
 // Checkbox and radio options
+//
+// In order to support the browser's form validation feedback, powered by the
+// `required` attribute, we have to "hide" the inputs via `opacity`. We cannot
+// use `display: none;` or `visibility: hidden;` as that also hides the popover.
+// This way, we ensure a DOM element is visible to position the popover from.
+//
+// See https://github.com/twbs/bootstrap/pull/12794 for more.
+
 [data-toggle="buttons"] > .btn > input[type="radio"],
 [data-toggle="buttons"] > .btn > input[type="checkbox"] {
-  display: none;
+  position: absolute;
+  z-index: -1;
+  opacity: 0;
 }
diff --git a/less/code.less b/less/code.less
index 3eed26c05..4d0eadc6d 100644
--- a/less/code.less
+++ b/less/code.less
@@ -17,7 +17,6 @@ code {
   font-size: 90%;
   color: @code-color;
   background-color: @code-bg;
-  white-space: nowrap;
   border-radius: @border-radius-base;
 }
 
diff --git a/less/component-animations.less b/less/component-animations.less
index 1efe45e2c..9400a0d32 100644
--- a/less/component-animations.less
+++ b/less/component-animations.less
@@ -5,7 +5,7 @@
 // Heads up!
 //
 // We don't use the `.opacity()` mixin here since it causes a bug with text
-// fields in IE7-8. Source: https://github.com/twitter/bootstrap/pull/3552.
+// fields in IE7-8. Source: https://github.com/twbs/bootstrap/pull/3552.
 
 .fade {
   opacity: 0;
@@ -17,10 +17,12 @@
 
 .collapse {
   display: none;
-  &.in {
-    display: block;
-  }
+
+  &.in      { display: block; }
+  tr&.in    { display: table-row; }
+  tbody&.in { display: table-row-group; }
 }
+
 .collapsing {
   position: relative;
   height: 0;
diff --git a/less/forms.less b/less/forms.less
index f607b8509..de17d1c82 100644
--- a/less/forms.less
+++ b/less/forms.less
@@ -51,7 +51,7 @@ input[type="search"] {
 input[type="radio"],
 input[type="checkbox"] {
   margin: 4px 0 0;
-  margin-top: 1px \9; /* IE8-9 */
+  margin-top: 1px \9; // IE8-9
   line-height: normal;
 }
 
@@ -167,10 +167,20 @@ input[type="search"] {
 // Special styles for iOS date input
 //
 // In Mobile Safari, date inputs require a pixel line-height that matches the
-// given height of the input.
+// given height of the input. Since this fucks up everything else, we have to
+// appropriately reset it for Internet Explorer and the size variations.
 
 input[type="date"] {
   line-height: @input-height-base;
+  // IE8+ misaligns the text within date inputs, so we reset
+  line-height: @line-height-base ~"\0";
+
+  &.input-sm {
+    line-height: @input-height-small;
+  }
+  &.input-lg {
+    line-height: @input-height-large;
+  }
 }
 
 
@@ -271,18 +281,27 @@ input[type="checkbox"],
   .form-control {
     padding-right: (@input-height-base * 1.25);
   }
-
-  // Feedback icon (requires .glyphicon classes)
-  .form-control-feedback {
-    position: absolute;
-    top: (@line-height-computed + 5); // Height of the `label` and its margin
-    right: 0;
-    display: block;
-    width: @input-height-base;
-    height: @input-height-base;
-    line-height: @input-height-base;
-    text-align: center;
-  }
+}
+// Feedback icon (requires .glyphicon classes)
+.form-control-feedback {
+  position: absolute;
+  top: (@line-height-computed + 5); // Height of the `label` and its margin
+  right: 0;
+  display: block;
+  width: @input-height-base;
+  height: @input-height-base;
+  line-height: @input-height-base;
+  text-align: center;
+}
+.input-lg + .form-control-feedback {
+  width: @input-height-large;
+  height: @input-height-large;
+  line-height: @input-height-large;
+}
+.input-sm + .form-control-feedback {
+  width: @input-height-small;
+  height: @input-height-small;
+  line-height: @input-height-small;
 }
 
 // Feedback states
@@ -349,6 +368,18 @@ input[type="checkbox"],
       width: auto; // Prevent labels from stacking above inputs in `.form-group`
       vertical-align: middle;
     }
+
+    .input-group {
+      display: inline-table;
+      vertical-align: middle;
+
+      .input-group-addon,
+      .input-group-btn,
+      .form-control {
+        width: auto;
+      }
+    }
+
     // Input groups need that 100% width though
     .input-group > .form-control {
       width: 100%;
@@ -394,8 +425,9 @@ input[type="checkbox"],
 
 .form-horizontal {
 
-  // Consistent vertical alignment of labels, radios, and checkboxes
-  .control-label,
+  // Consistent vertical alignment of radios and checkboxes
+  //
+  // Labels also get some reset styles, but that is scoped to a media query below.
   .radio,
   .checkbox,
   .radio-inline,
@@ -418,12 +450,16 @@ input[type="checkbox"],
 
   .form-control-static {
     padding-top: (@padding-base-vertical + 1);
+    padding-bottom: (@padding-base-vertical + 1);
   }
 
-  // Only right align form labels here when the columns stop stacking
+  // Reset spacing and right align labels, but scope to media queries so that
+  // labels on narrow viewports stack the same as a default form example.
   @media (min-width: @screen-sm-min) {
     .control-label {
       text-align: right;
+      margin-bottom: 0;
+      padding-top: (@padding-base-vertical + 1); // Default padding plus a border
     }
   }
 
diff --git a/less/jumbotron.less b/less/jumbotron.less
index a15e16971..27cd8b81d 100644
--- a/less/jumbotron.less
+++ b/less/jumbotron.less
@@ -19,6 +19,10 @@
     font-weight: 200;
   }
 
+  > hr {
+    border-top-color: darken(@jumbotron-bg, 10%);
+  }
+
   .container & {
     border-radius: @border-radius-large; // Only round corners at higher resolutions if contained in a container
   }
diff --git a/less/labels.less b/less/labels.less
index 5db1ed12c..9a5a27006 100644
--- a/less/labels.less
+++ b/less/labels.less
@@ -15,7 +15,7 @@
   border-radius: .25em;
 
   // Add hover effects, but only for links
-  &[href] {
+  a& {
     &:hover,
     &:focus {
       color: @label-link-hover-color;
diff --git a/less/list-group.less b/less/list-group.less
index 3343f8e5e..2514389b1 100644
--- a/less/list-group.less
+++ b/less/list-group.less
@@ -62,8 +62,27 @@ a.list-group-item {
   &:hover,
   &:focus {
     text-decoration: none;
+    color: @list-group-link-hover-color;
     background-color: @list-group-hover-bg;
   }
+}
+
+.list-group-item {
+  // Disabled state
+  &.disabled,
+  &.disabled:hover,
+  &.disabled:focus {
+    background-color: @list-group-disabled-bg;
+    color: @list-group-disabled-color;
+
+    // Force color to inherit for custom content
+    .list-group-item-heading {
+      color: inherit;
+    }
+    .list-group-item-text {
+      color: @list-group-disabled-text-color;
+    }
+  }
 
   // Active class on item itself, not parent
   &.active,
diff --git a/less/mixins.less b/less/mixins.less
index 397da934a..2682b67f8 100644
--- a/less/mixins.less
+++ b/less/mixins.less
@@ -3,8 +3,78 @@
 // --------------------------------------------------
 
 
+// Table of Contents
+//
+// Utilities
+// - Clearfix
+// - WebKit-style focus
+// - Center-align a block level element
+// - Sizing shortcuts
+// - Placeholder text
+// - Text overflow
+// - Requires inline-block or block for proper styling
+// - CSS image replacement
+//
+// CSS3 properties
+// - Single side border-radius
+// - Drop shadows
+// - Transitions
+// - Transformations
+// - Animations
+// - Backface visibility
+// - Prevent browsers from flickering when using CSS 3D transforms.
+// - Box sizing
+// - User select
+// - For selecting text on the page
+// - Resize anything
+// - CSS3 Content Columns
+// - Optional hyphenation
+// - Opacity
+//
+// Gradients
+// - Reset filters for IE
+// - Retina images
+// - Responsive image
+//
+// Component mixins
+// - Horizontal dividers
+// - Dividers (basically an hr) within dropdowns and nav lists
+// - Panels
+// - Alerts
+// - Tables
+// - List Groups
+// - Button variants
+// - Button sizes
+// - Pagination
+// - Labels
+// - Contextual backgrounds
+// - Typography
+// - Navbar vertical align
+// - Vertically center elements in the navbar
+// - Progress bars
+//
+// Responsive utilities
+//
+// Forms
+// - Form control focus state
+// - Form control sizing
+//
+// Grid system
+// - Centered container element
+// - Generate the extra small columns
+// - Generate the small columns
+// - Generate the medium columns
+// - Generate the large columns
+//
+// Framework grid generation
+// - Loop to generate grid all grid classes
+// - Form validation states
+// - Form control focus state
+
+
+
 // Utilities
-// -------------------------
+// --------------------------------------------------
 
 // Clearfix
 // Source: http://nicolasgallagher.com/micro-clearfix-hack/
@@ -72,8 +142,7 @@
 //
 // Heads up! v3 launched with with only `.hide-text()`, but per our pattern for
 // mixins being reused as classes with the same name, this doesn't hold up. As
-// of v3.0.1 we have added `.text-hide()` and deprecated `.hide-text()`. Note
-// that we cannot chain the mixins together in Less, so they are repeated.
+// of v3.0.1 we have added `.text-hide()` and deprecated `.hide-text()`.
 //
 // Source: https://github.com/h5bp/html5-boilerplate/commit/aa0396eae757
 
@@ -92,7 +161,7 @@
 
 
 
-// CSS3 PROPERTIES
+// CSS3 properties
 // --------------------------------------------------
 
 // Single side border-radius
@@ -124,22 +193,39 @@
 }
 
 // Transitions
+//
+// Deprecated as of v3.2.0 due to the introduction of autoprefixer (will be removed in v4)
 .transition(@transition) {
   -webkit-transition: @transition;
+       -o-transition: @transition;
           transition: @transition;
 }
+
+// Deprecated as of v3.2.0 due to the introduction of autoprefixer (will be removed in v4)
 .transition-property(@transition-property) {
   -webkit-transition-property: @transition-property;
           transition-property: @transition-property;
 }
+
+// Deprecated as of v3.2.0 due to the introduction of autoprefixer (will be removed in v4)
 .transition-delay(@transition-delay) {
   -webkit-transition-delay: @transition-delay;
           transition-delay: @transition-delay;
 }
+
+// Deprecated as of v3.2.0 due to the introduction of autoprefixer (will be removed in v4)
 .transition-duration(@transition-duration) {
   -webkit-transition-duration: @transition-duration;
           transition-duration: @transition-duration;
 }
+
+// Deprecated as of v3.2.0 due to the introduction of autoprefixer (will be removed in v4)
+.transition-timing-function(@timing-function) {
+  -webkit-transition-timing-function: @timing-function;
+          transition-timing-function: @timing-function;
+}
+
+// Deprecated as of v3.2.0 due to the introduction of autoprefixer (will be removed in v4)
 .transition-transform(@transition) {
   -webkit-transition: -webkit-transform @transition;
      -moz-transition: -moz-transform @transition;
@@ -148,65 +234,100 @@
 }
 
 // Transformations
+//
+// Deprecated as of v3.2.0 due to the introduction of autoprefixer (will be removed in v4)
 .scale(@ratio) {
   -webkit-transform: scale(@ratio);
       -ms-transform: scale(@ratio); // IE9 only
+       -o-transform: scale(@ratio);
           transform: scale(@ratio);
 }
+
+// Deprecated as of v3.2.0 due to the introduction of autoprefixer (will be removed in v4)
 .scale(@ratioX; @ratioY) {
   -webkit-transform: scale(@ratioX, @ratioY);
       -ms-transform: scale(@ratioX, @ratioY); // IE9 only
+       -o-transform: scale(@ratioX, @ratioY);
           transform: scale(@ratioX, @ratioY);
 }
+
+// Deprecated as of v3.2.0 due to the introduction of autoprefixer (will be removed in v4)
 .scaleX(@ratio) {
   -webkit-transform: scaleX(@ratio);
       -ms-transform: scaleX(@ratio); // IE9 only
+       -o-transform: scaleX(@ratio);
           transform: scaleX(@ratio);
 }
+
+// Deprecated as of v3.2.0 due to the introduction of autoprefixer (will be removed in v4)
 .scaleY(@ratio) {
   -webkit-transform: scaleY(@ratio);
       -ms-transform: scaleY(@ratio); // IE9 only
+       -o-transform: scaleY(@ratio);
           transform: scaleY(@ratio);
 }
+
+// Deprecated as of v3.2.0 due to the introduction of autoprefixer (will be removed in v4)
 .skew(@x; @y) {
   -webkit-transform: skew(@x, @y);
       -ms-transform: skewX(@x) skewY(@y); // See https://github.com/twbs/bootstrap/issues/4885; IE9+
+       -o-transform: skew(@x, @y);
           transform: skew(@x, @y);
 }
+
+// Deprecated as of v3.2.0 due to the introduction of autoprefixer (will be removed in v4)
 .translate(@x; @y) {
   -webkit-transform: translate(@x, @y);
       -ms-transform: translate(@x, @y); // IE9 only
+       -o-transform: translate(@x, @y);
           transform: translate(@x, @y);
 }
+
+// Deprecated as of v3.2.0 due to the introduction of autoprefixer (will be removed in v4)
 .translate3d(@x; @y; @z) {
   -webkit-transform: translate3d(@x, @y, @z);
           transform: translate3d(@x, @y, @z);
 }
+
+// Deprecated as of v3.2.0 due to the introduction of autoprefixer (will be removed in v4)
 .rotate(@degrees) {
   -webkit-transform: rotate(@degrees);
       -ms-transform: rotate(@degrees); // IE9 only
+       -o-transform: rotate(@degrees);
           transform: rotate(@degrees);
 }
+
+// Deprecated as of v3.2.0 due to the introduction of autoprefixer (will be removed in v4)
 .rotateX(@degrees) {
   -webkit-transform: rotateX(@degrees);
       -ms-transform: rotateX(@degrees); // IE9 only
+       -o-transform: rotateX(@degrees);
           transform: rotateX(@degrees);
 }
+
+// Deprecated as of v3.2.0 due to the introduction of autoprefixer (will be removed in v4)
 .rotateY(@degrees) {
   -webkit-transform: rotateY(@degrees);
       -ms-transform: rotateY(@degrees); // IE9 only
+       -o-transform: rotateY(@degrees);
           transform: rotateY(@degrees);
 }
+
+// Deprecated as of v3.2.0 due to the introduction of autoprefixer (will be removed in v4)
 .perspective(@perspective) {
   -webkit-perspective: @perspective;
      -moz-perspective: @perspective;
           perspective: @perspective;
 }
+
+// Deprecated as of v3.2.0 due to the introduction of autoprefixer (will be removed in v4)
 .perspective-origin(@perspective) {
   -webkit-perspective-origin: @perspective;
      -moz-perspective-origin: @perspective;
           perspective-origin: @perspective;
 }
+
+// Deprecated as of v3.2.0 due to the introduction of autoprefixer (will be removed in v4)
 .transform-origin(@origin) {
   -webkit-transform-origin: @origin;
      -moz-transform-origin: @origin;
@@ -215,38 +336,58 @@
 }
 
 // Animations
+//
+// Deprecated as of v3.2.0 due to the introduction of autoprefixer (will be removed in v4)
 .animation(@animation) {
   -webkit-animation: @animation;
+       -o-animation: @animation;
           animation: @animation;
 }
+
+// Deprecated as of v3.2.0 due to the introduction of autoprefixer (will be removed in v4)
 .animation-name(@name) {
   -webkit-animation-name: @name;
           animation-name: @name;
 }
+
+// Deprecated as of v3.2.0 due to the introduction of autoprefixer (will be removed in v4)
 .animation-duration(@duration) {
   -webkit-animation-duration: @duration;
           animation-duration: @duration;
 }
+
+// Deprecated as of v3.2.0 due to the introduction of autoprefixer (will be removed in v4)
 .animation-timing-function(@timing-function) {
   -webkit-animation-timing-function: @timing-function;
           animation-timing-function: @timing-function;
 }
+
+// Deprecated as of v3.2.0 due to the introduction of autoprefixer (will be removed in v4)
 .animation-delay(@delay) {
   -webkit-animation-delay: @delay;
           animation-delay: @delay;
 }
+
+// Deprecated as of v3.2.0 due to the introduction of autoprefixer (will be removed in v4)
 .animation-iteration-count(@iteration-count) {
   -webkit-animation-iteration-count: @iteration-count;
           animation-iteration-count: @iteration-count;
 }
+
+// Deprecated as of v3.2.0 due to the introduction of autoprefixer (will be removed in v4)
 .animation-direction(@direction) {
   -webkit-animation-direction: @direction;
           animation-direction: @direction;
 }
+.animation-fill-mode(@fill-mode) {
+  -webkit-animation-fill-mode: @fill-mode;
+          animation-fill-mode: @fill-mode;
+}
 
 // Backface visibility
 // Prevent browsers from flickering when using CSS 3D transforms.
 // Default value is `visible`, but can be changed to `hidden`
+// Deprecated as of v3.2.0 due to the introduction of autoprefixer (will be removed in v4)
 .backface-visibility(@visibility){
   -webkit-backface-visibility: @visibility;
      -moz-backface-visibility: @visibility;
@@ -254,6 +395,7 @@
 }
 
 // Box sizing
+// Deprecated as of v3.2.0 due to the introduction of autoprefixer (will be removed in v4)
 .box-sizing(@boxmodel) {
   -webkit-box-sizing: @boxmodel;
      -moz-box-sizing: @boxmodel;
@@ -262,6 +404,7 @@
 
 // User select
 // For selecting text on the page
+// Deprecated as of v3.2.0 due to the introduction of autoprefixer (will be removed in v4)
 .user-select(@select) {
   -webkit-user-select: @select;
      -moz-user-select: @select;
@@ -305,7 +448,7 @@
 
 
 
-// GRADIENTS
+// Gradients
 // --------------------------------------------------
 
 #gradient {
@@ -316,7 +459,8 @@
   // Color stops are not available in IE9 and below.
   .horizontal(@start-color: #555; @end-color: #333; @start-percent: 0%; @end-percent: 100%) {
     background-image: -webkit-linear-gradient(left, color-stop(@start-color @start-percent), color-stop(@end-color @end-percent)); // Safari 5.1-6, Chrome 10+
-    background-image:  linear-gradient(to right, @start-color @start-percent, @end-color @end-percent); // Standard, IE10, Firefox 16+, Opera 12.10+, Safari 7+, Chrome 26+
+    background-image: -o-linear-gradient(left, @start-color @start-percent, @end-color @end-percent); // Opera 12
+    background-image: linear-gradient(to right, @start-color @start-percent, @end-color @end-percent); // Standard, IE10, Firefox 16+, Opera 12.10+, Safari 7+, Chrome 26+
     background-repeat: repeat-x;
     filter: e(%("progid:DXImageTransform.Microsoft.gradient(startColorstr='%d', endColorstr='%d', GradientType=1)",argb(@start-color),argb(@end-color))); // IE9 and down
   }
@@ -327,6 +471,7 @@
   // Color stops are not available in IE9 and below.
   .vertical(@start-color: #555; @end-color: #333; @start-percent: 0%; @end-percent: 100%) {
     background-image: -webkit-linear-gradient(top, @start-color @start-percent, @end-color @end-percent);  // Safari 5.1-6, Chrome 10+
+    background-image: -o-linear-gradient(top, @start-color @start-percent, @end-color @end-percent);  // Opera 12
     background-image: linear-gradient(to bottom, @start-color @start-percent, @end-color @end-percent); // Standard, IE10, Firefox 16+, Opera 12.10+, Safari 7+, Chrome 26+
     background-repeat: repeat-x;
     filter: e(%("progid:DXImageTransform.Microsoft.gradient(startColorstr='%d', endColorstr='%d', GradientType=0)",argb(@start-color),argb(@end-color))); // IE9 and down
@@ -335,16 +480,19 @@
   .directional(@start-color: #555; @end-color: #333; @deg: 45deg) {
     background-repeat: repeat-x;
     background-image: -webkit-linear-gradient(@deg, @start-color, @end-color); // Safari 5.1-6, Chrome 10+
+    background-image: -o-linear-gradient(@deg, @start-color, @end-color); // Opera 12
     background-image: linear-gradient(@deg, @start-color, @end-color); // Standard, IE10, Firefox 16+, Opera 12.10+, Safari 7+, Chrome 26+
   }
   .horizontal-three-colors(@start-color: #00b3ee; @mid-color: #7a43b6; @color-stop: 50%; @end-color: #c3325f) {
     background-image: -webkit-linear-gradient(left, @start-color, @mid-color @color-stop, @end-color);
+    background-image: -o-linear-gradient(left, @start-color, @mid-color @color-stop, @end-color);
     background-image: linear-gradient(to right, @start-color, @mid-color @color-stop, @end-color);
     background-repeat: no-repeat;
     filter: e(%("progid:DXImageTransform.Microsoft.gradient(startColorstr='%d', endColorstr='%d', GradientType=1)",argb(@start-color),argb(@end-color))); // IE9 and down, gets no color-stop at all for proper fallback
   }
   .vertical-three-colors(@start-color: #00b3ee; @mid-color: #7a43b6; @color-stop: 50%; @end-color: #c3325f) {
     background-image: -webkit-linear-gradient(@start-color, @mid-color @color-stop, @end-color);
+    background-image: -o-linear-gradient(@start-color, @mid-color @color-stop, @end-color);
     background-image: linear-gradient(@start-color, @mid-color @color-stop, @end-color);
     background-repeat: no-repeat;
     filter: e(%("progid:DXImageTransform.Microsoft.gradient(startColorstr='%d', endColorstr='%d', GradientType=0)",argb(@start-color),argb(@end-color))); // IE9 and down, gets no color-stop at all for proper fallback
@@ -356,6 +504,7 @@
   }
   .striped(@color: rgba(255,255,255,.15); @angle: 45deg) {
     background-image: -webkit-linear-gradient(@angle, @color 25%, transparent 25%, transparent 50%, @color 50%, @color 75%, transparent 75%, transparent);
+    background-image: -o-linear-gradient(@angle, @color 25%, transparent 25%, transparent 50%, @color 50%, @color 75%, transparent 75%, transparent);
     background-image: linear-gradient(@angle, @color 25%, transparent 25%, transparent 50%, @color 50%, @color 75%, transparent 75%, transparent);
   }
 }
@@ -371,9 +520,10 @@
 
 
 // Retina images
-//
-// Short retina mixin for setting background-image and -size
+// --------------------------------------------------
 
+// Short retina mixin for setting background-image and -size. Note that the
+// spelling of `min--moz-device-pixel-ratio` is intentional.
 .img-retina(@file-1x; @file-2x; @width-1x; @height-1x) {
   background-image: url("@{file-1x}");
 
@@ -390,10 +540,11 @@
 }
 
 
+
 // Responsive image
-//
-// Keep images from scaling beyond the width of their parents.
+// --------------------------------------------------
 
+// Keep images from scaling beyond the width of their parents.
 .img-responsive(@display: block) {
   display: @display;
   max-width: 100%; // Part 1: Set a maximum relative to the parent
@@ -401,11 +552,12 @@
 }
 
 
-// COMPONENT MIXINS
+
+// Component mixins
 // --------------------------------------------------
 
 // Horizontal dividers
-// -------------------------
+//
 // Dividers (basically an hr) within dropdowns and nav lists
 .nav-divider(@color: #e5e5e5) {
   height: 1px;
@@ -415,7 +567,6 @@
 }
 
 // Panels
-// -------------------------
 .panel-variant(@border; @heading-text-color; @heading-bg-color; @heading-border) {
   border-color: @border;
 
@@ -424,19 +575,18 @@
     background-color: @heading-bg-color;
     border-color: @heading-border;
 
-    + .panel-collapse .panel-body {
+    + .panel-collapse > .panel-body {
       border-top-color: @border;
     }
   }
   & > .panel-footer {
-    + .panel-collapse .panel-body {
+    + .panel-collapse > .panel-body {
       border-bottom-color: @border;
     }
   }
 }
 
 // Alerts
-// -------------------------
 .alert-variant(@background; @border; @text-color) {
   background-color: @background;
   border-color: @border;
@@ -451,7 +601,6 @@
 }
 
 // Tables
-// -------------------------
 .table-row-variant(@state; @background) {
   // Exact selectors below required to override `.table-striped` and prevent
   // inheritance to nested tables.
@@ -479,7 +628,6 @@
 }
 
 // List Groups
-// -------------------------
 .list-group-item-variant(@state; @background; @color) {
   .list-group-item-@{state} {
     color: @color;
@@ -507,7 +655,7 @@
 }
 
 // Button variants
-// -------------------------
+//
 // Easily pump out default styles, as well as :hover, :focus, :active,
 // and disabled options for all buttons
 .button-variant(@color; @background; @border) {
@@ -521,7 +669,7 @@
   &.active,
   .open .dropdown-toggle& {
     color: @color;
-    background-color: darken(@background, 8%);
+    background-color: darken(@background, 10%);
         border-color: darken(@border, 12%);
   }
   &:active,
@@ -549,7 +697,6 @@
 }
 
 // Button sizes
-// -------------------------
 .button-size(@padding-vertical; @padding-horizontal; @font-size; @line-height; @border-radius) {
   padding: @padding-vertical @padding-horizontal;
   font-size: @font-size;
@@ -558,7 +705,6 @@
 }
 
 // Pagination
-// -------------------------
 .pagination-size(@padding-vertical; @padding-horizontal; @font-size; @border-radius) {
   > li {
     > a,
@@ -582,7 +728,6 @@
 }
 
 // Labels
-// -------------------------
 .label-variant(@color) {
   background-color: @color;
   &[href] {
@@ -594,7 +739,6 @@
 }
 
 // Contextual backgrounds
-// -------------------------
 .bg-variant(@color) {
   background-color: @color;
   a&:hover {
@@ -603,7 +747,6 @@
 }
 
 // Typography
-// -------------------------
 .text-emphasis-variant(@color) {
   color: @color;
   a&:hover {
@@ -612,7 +755,7 @@
 }
 
 // Navbar vertical align
-// -------------------------
+//
 // Vertically center elements in the navbar.
 // Example: an element has a height of 30px, so write out `.navbar-vertical-align(30px);` to calculate the appropriate top margin.
 .navbar-vertical-align(@element-height) {
@@ -621,7 +764,6 @@
 }
 
 // Progress bars
-// -------------------------
 .progress-bar-variant(@color) {
   background-color: @color;
   .progress-striped & {
@@ -630,7 +772,7 @@
 }
 
 // Responsive utilities
-// -------------------------
+//
 // More easily include all the states for responsive-utilities.less.
 // Note: Deprecated .responsive-visibility() as of v3.2.0
 .responsive-visibility() {
@@ -647,8 +789,97 @@
 }
 
 
-// Grid System
-// -----------
+
+// Form validation states
+//
+// Used in forms.less to generate the form validation CSS for warnings, errors,
+// and successes.
+
+.form-control-validation(@text-color: #555; @border-color: #ccc; @background-color: #f5f5f5) {
+  // Color the label and help text
+  .help-block,
+  .control-label,
+  .radio,
+  .checkbox,
+  .radio-inline,
+  .checkbox-inline  {
+    color: @text-color;
+  }
+  // Set the border and box shadow on specific inputs to match
+  .form-control {
+    border-color: @border-color;
+    .box-shadow(inset 0 1px 1px rgba(0,0,0,.075)); // Redeclare so transitions work
+    &:focus {
+      border-color: darken(@border-color, 10%);
+      @shadow: inset 0 1px 1px rgba(0,0,0,.075), 0 0 6px lighten(@border-color, 20%);
+      .box-shadow(@shadow);
+    }
+  }
+  // Set validation states also for addons
+  .input-group-addon {
+    color: @text-color;
+    border-color: @border-color;
+    background-color: @background-color;
+  }
+  // Optional feedback icon
+  .form-control-feedback {
+    color: @text-color;
+  }
+}
+
+
+
+// Forms
+// --------------------------------------------------
+
+// Form control focus state
+//
+// Generate a customized focus state and for any input with the specified color,
+// which defaults to the `@input-focus-border` variable.
+//
+// We highly encourage you to not customize the default value, but instead use
+// this to tweak colors on an as-needed basis. This aesthetic change is based on
+// WebKit's default styles, but applicable to a wider range of browsers. Its
+// usability and accessibility should be taken into account with any change.
+//
+// Example usage: change the default blue border and shadow to white for better
+// contrast against a dark gray background.
+.form-control-focus(@color: @input-border-focus) {
+  @color-rgba: rgba(red(@color), green(@color), blue(@color), .6);
+  &:focus {
+    border-color: @color;
+    outline: 0;
+    .box-shadow(~"inset 0 1px 1px rgba(0,0,0,.075), 0 0 8px @{color-rgba}");
+  }
+}
+
+// Form control sizing
+//
+// Relative text size, padding, and border-radii changes for form controls. For
+// horizontal sizing, wrap controls in the predefined grid classes. `<select>`
+// element gets special love because it's special, and that's a fact!
+.input-size(@input-height; @padding-vertical; @padding-horizontal; @font-size; @line-height; @border-radius) {
+  height: @input-height;
+  padding: @padding-vertical @padding-horizontal;
+  font-size: @font-size;
+  line-height: @line-height;
+  border-radius: @border-radius;
+
+  select& {
+    height: @input-height;
+    line-height: @input-height;
+  }
+
+  textarea&,
+  select[multiple]& {
+    height: auto;
+  }
+}
+
+
+
+// Grid system
+// --------------------------------------------------
 
 // Centered container element
 .container-fixed() {
@@ -676,22 +907,15 @@
   padding-right: (@gutter / 2);
 }
 .make-xs-column-offset(@columns) {
-  @media (min-width: @screen-xs-min) {
-    margin-left: percentage((@columns / @grid-columns));
-  }
+  margin-left: percentage((@columns / @grid-columns));
 }
 .make-xs-column-push(@columns) {
-  @media (min-width: @screen-xs-min) {
-    left: percentage((@columns / @grid-columns));
-  }
+  left: percentage((@columns / @grid-columns));
 }
 .make-xs-column-pull(@columns) {
-  @media (min-width: @screen-xs-min) {
-    right: percentage((@columns / @grid-columns));
-  }
+  right: percentage((@columns / @grid-columns));
 }
 
-
 // Generate the small columns
 .make-sm-column(@columns; @gutter: @grid-gutter-width) {
   position: relative;
@@ -720,7 +944,6 @@
   }
 }
 
-
 // Generate the medium columns
 .make-md-column(@columns; @gutter: @grid-gutter-width) {
   position: relative;
@@ -749,7 +972,6 @@
   }
 }
 
-
 // Generate the large columns
 .make-lg-column(@columns; @gutter: @grid-gutter-width) {
   position: relative;
@@ -779,11 +1001,12 @@
 }
 
 
+
 // Framework grid generation
-//
+// --------------------------------------------------
+
 // Used only by Bootstrap to generate the correct number of grid classes given
 // any value of `@grid-columns`.
-
 .make-grid-columns() {
   // Common styles for all sizes of grid columns, widths 1-12
   .col(@index) when (@index = 1) { // initial
@@ -829,16 +1052,26 @@
     width: percentage((@index / @grid-columns));
   }
 }
-.calc-grid-column(@index, @class, @type) when (@type = push) {
+.calc-grid-column(@index, @class, @type) when (@type = push) and (@index > 0) {
   .col-@{class}-push-@{index} {
     left: percentage((@index / @grid-columns));
   }
 }
-.calc-grid-column(@index, @class, @type) when (@type = pull) {
+.calc-grid-column(@index, @class, @type) when (@type = push) and (@index = 0) {
+  .col-@{class}-push-0 {
+    left: auto;
+  }
+}
+.calc-grid-column(@index, @class, @type) when (@type = pull) and (@index > 0) {
   .col-@{class}-pull-@{index} {
     right: percentage((@index / @grid-columns));
   }
 }
+.calc-grid-column(@index, @class, @type) when (@type = pull) and (@index = 0) {
+  .col-@{class}-pull-0 {
+    right: auto;
+  }
+}
 .calc-grid-column(@index, @class, @type) when (@type = offset) {
   .col-@{class}-offset-@{index} {
     margin-left: percentage((@index / @grid-columns));
@@ -860,86 +1093,3 @@
   .loop-grid-columns(@grid-columns, @class, push);
   .loop-grid-columns(@grid-columns, @class, offset);
 }
-
-// Form validation states
-//
-// Used in forms.less to generate the form validation CSS for warnings, errors,
-// and successes.
-
-.form-control-validation(@text-color: #555; @border-color: #ccc; @background-color: #f5f5f5) {
-  // Color the label and help text
-  .help-block,
-  .control-label,
-  .radio,
-  .checkbox,
-  .radio-inline,
-  .checkbox-inline  {
-    color: @text-color;
-  }
-  // Set the border and box shadow on specific inputs to match
-  .form-control {
-    border-color: @border-color;
-    .box-shadow(inset 0 1px 1px rgba(0,0,0,.075)); // Redeclare so transitions work
-    &:focus {
-      border-color: darken(@border-color, 10%);
-      @shadow: inset 0 1px 1px rgba(0,0,0,.075), 0 0 6px lighten(@border-color, 20%);
-      .box-shadow(@shadow);
-    }
-  }
-  // Set validation states also for addons
-  .input-group-addon {
-    color: @text-color;
-    border-color: @border-color;
-    background-color: @background-color;
-  }
-  // Optional feedback icon
-  .form-control-feedback {
-    color: @text-color;
-  }
-}
-
-// Form control focus state
-//
-// Generate a customized focus state and for any input with the specified color,
-// which defaults to the `@input-focus-border` variable.
-//
-// We highly encourage you to not customize the default value, but instead use
-// this to tweak colors on an as-needed basis. This aesthetic change is based on
-// WebKit's default styles, but applicable to a wider range of browsers. Its
-// usability and accessibility should be taken into account with any change.
-//
-// Example usage: change the default blue border and shadow to white for better
-// contrast against a dark gray background.
-
-.form-control-focus(@color: @input-border-focus) {
-  @color-rgba: rgba(red(@color), green(@color), blue(@color), .6);
-  &:focus {
-    border-color: @color;
-    outline: 0;
-    .box-shadow(~"inset 0 1px 1px rgba(0,0,0,.075), 0 0 8px @{color-rgba}");
-  }
-}
-
-// Form control sizing
-//
-// Relative text size, padding, and border-radii changes for form controls. For
-// horizontal sizing, wrap controls in the predefined grid classes. `<select>`
-// element gets special love because it's special, and that's a fact!
-
-.input-size(@input-height; @padding-vertical; @padding-horizontal; @font-size; @line-height; @border-radius) {
-  height: @input-height;
-  padding: @padding-vertical @padding-horizontal;
-  font-size: @font-size;
-  line-height: @line-height;
-  border-radius: @border-radius;
-
-  select& {
-    height: @input-height;
-    line-height: @input-height;
-  }
-
-  textarea&,
-  select[multiple]& {
-    height: auto;
-  }
-}
diff --git a/less/modals.less b/less/modals.less
index f4e95346b..0ba977e6d 100644
--- a/less/modals.less
+++ b/less/modals.less
@@ -98,7 +98,7 @@
 
 // Footer (for actions)
 .modal-footer {
-  padding: (@modal-inner-padding - 1) @modal-inner-padding @modal-inner-padding;
+  padding: @modal-inner-padding;
   text-align: right; // right align buttons
   border-top: 1px solid @modal-footer-border-color;
   &:extend(.clearfix all); // clear it in case folks use .pull-* classes on buttons
diff --git a/less/navbar.less b/less/navbar.less
index 8c4c210b2..6ddf26356 100644
--- a/less/navbar.less
+++ b/less/navbar.less
@@ -48,7 +48,6 @@
 // content for the user's viewport.
 
 .navbar-collapse {
-  max-height: @navbar-collapse-max-height;
   overflow-x: visible;
   padding-right: @navbar-padding-horizontal;
   padding-left:  @navbar-padding-horizontal;
@@ -88,6 +87,17 @@
   }
 }
 
+.navbar-fixed-top,
+.navbar-fixed-bottom {
+  .navbar-collapse {
+    max-height: @navbar-collapse-max-height;
+
+    @media (max-width: @screen-phone) and (orientation: landscape) {
+      max-height: 200px;
+    }
+  }
+}
+
 
 // Both navbar header and collapse
 //
@@ -492,6 +502,20 @@
     }
   }
 
+  .btn-link {
+    color: @navbar-default-link-color;
+    &:hover,
+    &:focus {
+      color: @navbar-default-link-hover-color;
+    }
+    &[disabled],
+    fieldset[disabled] & {
+      &:hover,
+      &:focus {
+        color: @navbar-default-link-disabled-color;
+      }
+    }
+  }
 }
 
 // Inverse navbar
@@ -613,4 +637,18 @@
     }
   }
 
+  .btn-link {
+    color: @navbar-inverse-link-color;
+    &:hover,
+    &:focus {
+      color: @navbar-inverse-link-hover-color;
+    }
+    &[disabled],
+    fieldset[disabled] & {
+      &:hover,
+      &:focus {
+        color: @navbar-inverse-link-disabled-color;
+      }
+    }
+  }
 }
diff --git a/less/panels.less b/less/panels.less
index 20dd14938..9afa4cbfd 100644
--- a/less/panels.less
+++ b/less/panels.less
@@ -20,7 +20,7 @@
 
 // Optional heading
 .panel-heading {
-  padding: 10px 15px;
+  padding: @panel-heading-padding;
   border-bottom: 1px solid transparent;
   .border-top-radius((@panel-border-radius - 1));
 
@@ -43,7 +43,7 @@
 
 // Optional footer (stays gray in every modifier class)
 .panel-footer {
-  padding: 10px 15px;
+  padding: @panel-footer-padding;
   background-color: @panel-footer-bg;
   border-top: 1px solid @panel-inner-border;
   .border-bottom-radius((@panel-border-radius - 1));
@@ -199,7 +199,6 @@
   .panel {
     margin-bottom: 0;
     border-radius: @panel-border-radius;
-    overflow: hidden; // crop contents when collapsed
     + .panel {
       margin-top: 5px;
     }
diff --git a/less/popovers.less b/less/popovers.less
index 696d74c7d..bf6af40a0 100644
--- a/less/popovers.less
+++ b/less/popovers.less
@@ -37,7 +37,7 @@
   line-height: 18px;
   background-color: @popover-title-bg;
   border-bottom: 1px solid darken(@popover-title-bg, 5%);
-  border-radius: 5px 5px 0 0;
+  border-radius: (@border-radius-large - 1) (@border-radius-large - 1) 0 0;
 }
 
 .popover-content {
diff --git a/less/progress-bars.less b/less/progress-bars.less
index 76c87be17..74b702843 100644
--- a/less/progress-bars.less
+++ b/less/progress-bars.less
@@ -6,13 +6,6 @@
 // Bar animations
 // -------------------------
 
-// WebKit
-@-webkit-keyframes progress-bar-stripes {
-  from  { background-position: 40px 0; }
-  to    { background-position: 0 0; }
-}
-
-// Spec and IE10+
 @keyframes progress-bar-stripes {
   from  { background-position: 40px 0; }
   to    { background-position: 0 0; }
@@ -58,6 +51,22 @@
   .animation(progress-bar-stripes 2s linear infinite);
 }
 
+// Account for lower percentages
+.progress-bar {
+  &[aria-valuenow="1"],
+  &[aria-valuenow="2"] {
+    min-width: 30px;
+  }
+
+  &[aria-valuenow="0"] {
+    color: @gray-light;
+    min-width: 30px;
+    background-color: transparent;
+    background-image: none;
+    box-shadow: none;
+  }
+}
+
 
 
 // Variations
diff --git a/less/responsive-embed.less b/less/responsive-embed.less
new file mode 100644
index 000000000..a884d49fe
--- /dev/null
+++ b/less/responsive-embed.less
@@ -0,0 +1,34 @@
+// Embeds responsive
+//
+// Credit: Nicolas Gallagher and SUIT CSS.
+
+.embed-responsive {
+  position: relative;
+  display: block;
+  height: 0;
+  padding: 0;
+  overflow: hidden;
+
+  .embed-responsive-item,
+  iframe,
+  embed,
+  object {
+    position: absolute;
+    top: 0;
+    left: 0;
+    bottom: 0;
+    height: 100%;
+    width: 100%;
+    border: 0;
+  }
+
+  // Modifier class for 16:9 aspect ratio
+  &.embed-responsive-16by9 {
+    padding-bottom: 56.25%;
+  }
+
+  // Modifier class for 4:3 aspect ratio
+  &.embed-responsive-4by3 {
+    padding-bottom: 75%;
+  }
+}
diff --git a/less/scaffolding.less b/less/scaffolding.less
index fe29f2d62..c658d7bf5 100644
--- a/less/scaffolding.less
+++ b/less/scaffolding.less
@@ -132,3 +132,19 @@ hr {
   clip: rect(0,0,0,0);
   border: 0;
 }
+
+// Use in conjunction with .sr-only to only display content when it's focused.
+// Useful for "Skip to main content" links; see http://www.w3.org/TR/2013/NOTE-WCAG20-TECHS-20130905/G1
+// Credit: HTML5 Boilerplate
+
+.sr-only-focusable {
+  &:active,
+  &:focus {
+    position: static;
+    width: auto;
+    height: auto;
+    margin: 0;
+    overflow: visible;
+    clip: auto;
+  }
+}
diff --git a/less/tables.less b/less/tables.less
index d5c0afd01..555d7924c 100644
--- a/less/tables.less
+++ b/less/tables.less
@@ -169,7 +169,7 @@ table {
 // will display normally.
 
 .table-responsive {
-  @media (max-width: @screen-xs-max) {
+  @media screen and (max-width: @screen-xs-max) {
     width: 100%;
     margin-bottom: (@line-height-computed * 0.75);
     overflow-y: hidden;
diff --git a/less/type.less b/less/type.less
index 5e2a21905..91298f1c0 100644
--- a/less/type.less
+++ b/less/type.less
@@ -81,6 +81,12 @@ small,
 // Undo browser default styling
 cite    { font-style: normal; }
 
+mark,
+.mark {
+  background-color: @state-warning-bg;
+  padding: .2em;
+}
+
 // Alignment
 .text-left           { text-align: left; }
 .text-right          { text-align: right; }
@@ -141,7 +147,7 @@ cite    { font-style: normal; }
 
 
 // Lists
-// --------------------------------------------------
+// -------------------------
 
 // Unordered and Ordered lists
 ul,
@@ -195,8 +201,12 @@ dd {
 // Defaults to being stacked without any of the below styles applied, until the
 // grid breakpoint is reached (default of ~768px).
 
-@media (min-width: @grid-float-breakpoint) {
-  .dl-horizontal {
+.dl-horizontal {
+  dd {
+    &:extend(.clearfix all); // Clear the floated `dt` if an empty `dd` is present
+  }
+
+  @media (min-width: @grid-float-breakpoint) {
     dt {
       float: left;
       width: (@component-offset-horizontal - 20);
@@ -206,13 +216,13 @@ dd {
     }
     dd {
       margin-left: @component-offset-horizontal;
-      &:extend(.clearfix all); // Clear the floated `dt` if an empty `dd` is present
     }
   }
 }
 
-// MISC
-// ----
+
+// Misc
+// -------------------------
 
 // Abbreviations and acronyms
 abbr[title],
diff --git a/less/variables.less b/less/variables.less
index 3846adc59..82616ac56 100644
--- a/less/variables.less
+++ b/less/variables.less
@@ -68,14 +68,18 @@
 @headings-color:          inherit;
 
 
-//-- Iconography
+//== Iconography
 //
-//## Specify custom locations of the include Glyphicons icon font. Useful for those including Bootstrap via Bower.
+//## Specify custom location and filename of the included Glyphicons icon font. Useful for those including Bootstrap via Bower.
 
+//** Load fonts from this directory.
 @icon-font-path:          "../fonts/";
+//** File name for all font files.
 @icon-font-name:          "glyphicons-halflings-regular";
+//** Element ID within SVG icon file.
 @icon-font-svg-id:        "glyphicons_halflingsregular";
 
+
 //== Components
 //
 //## Define common padding and border radius sizes and more. Values based on 14px text and 1.428 line-height (~20px to start).
@@ -558,7 +562,7 @@
 //##
 
 //** Padding applied to the modal body
-@modal-inner-padding:         20px;
+@modal-inner-padding:         15px;
 
 //** Padding applied to the modal title
 @modal-title-padding:         15px;
@@ -643,17 +647,26 @@
 //** List group border radius
 @list-group-border-radius:      @border-radius-base;
 
-//** Background color of single list elements on hover
+//** Background color of single list items on hover
 @list-group-hover-bg:           #f5f5f5;
-//** Text color of active list elements
+//** Text color of active list items
 @list-group-active-color:       @component-active-color;
-//** Background color of active list elements
+//** Background color of active list items
 @list-group-active-bg:          @component-active-bg;
 //** Border color of active list elements
 @list-group-active-border:      @list-group-active-bg;
+//** Text color for content within active list items
 @list-group-active-text-color:  lighten(@list-group-active-bg, 40%);
 
+//** Text color of disabled list items
+@list-group-disabled-color:      @gray-light;
+//** Background color of disabled list items
+@list-group-disabled-bg:         @gray-lighter;
+//** Text color for content within disabled list items
+@list-group-disabled-text-color: @list-group-disabled-color;
+
 @list-group-link-color:         #555;
+@list-group-link-hover-color:   @list-group-link-color;
 @list-group-link-heading-color: #333;
 
 
@@ -663,6 +676,8 @@
 
 @panel-bg:                    #fff;
 @panel-body-padding:          15px;
+@panel-heading-padding:       10px 15px;
+@panel-footer-padding:        @panel-heading-padding;
 @panel-border-radius:         @border-radius-base;
 
 //** Border color for elements within panels