diff --git a/docs/components/collapse.md b/docs/components/collapse.md
index d5f620917..e98fae276 100644
--- a/docs/components/collapse.md
+++ b/docs/components/collapse.md
@@ -52,6 +52,7 @@ Extend the default collapse behavior to create an accordion.
         </a>
       </h5>
     </div>
+
     <div id="collapseOne" class="collapse in" role="tabpanel" aria-labelledby="headingOne">
       <div class="card-block">
         Anim pariatur cliche reprehenderit, enim eiusmod high life accusamus terry richardson ad squid. 3 wolf moon officia aute, non cupidatat skateboard dolor brunch. Food truck quinoa nesciunt laborum eiusmod. Brunch 3 wolf moon tempor, sunt aliqua put a bird on it squid single-origin coffee nulla assumenda shoreditch et. Nihil anim keffiyeh helvetica, craft beer labore wes anderson cred nesciunt sapiente ea proident. Ad vegan excepteur butcher vice lomo. Leggings occaecat craft beer farm-to-table, raw denim aesthetic synth nesciunt you probably haven't heard of them accusamus labore sustainable VHS.
diff --git a/js/src/collapse.js b/js/src/collapse.js
index 3fb0245e7..560ab2cbd 100644
--- a/js/src/collapse.js
+++ b/js/src/collapse.js
@@ -56,7 +56,7 @@ const Collapse = (($) => {
   }
 
   const Selector = {
-    ACTIVES     : '.panel > .in, .panel > .collapsing',
+    ACTIVES     : '.card > .in, .card > .collapsing',
     DATA_TOGGLE : '[data-toggle="collapse"]'
   }
 
diff --git a/js/tests/unit/collapse.js b/js/tests/unit/collapse.js
index d387ebb18..892da52ed 100644
--- a/js/tests/unit/collapse.js
+++ b/js/tests/unit/collapse.js
@@ -235,12 +235,12 @@ $(function () {
     assert.expect(3)
     var done = assert.async()
 
-    var accordionHTML = '<div class="panel-group" id="accordion">'
-        + '<div class="panel"/>'
-        + '<div class="panel"/>'
-        + '<div class="panel"/>'
+    var accordionHTML = '<div id="accordion">'
+        + '<div class="card"/>'
+        + '<div class="card"/>'
+        + '<div class="card"/>'
         + '</div>'
-    var $groups = $(accordionHTML).appendTo('#qunit-fixture').find('.panel')
+    var $groups = $(accordionHTML).appendTo('#qunit-fixture').find('.card')
 
     var $target1 = $('<a role="button" data-toggle="collapse" href="#body1" data-parent="#accordion"/>').appendTo($groups.eq(0))
 
@@ -269,12 +269,12 @@ $(function () {
     assert.expect(3)
     var done = assert.async()
 
-    var accordionHTML = '<div class="panel-group accordion">'
-        + '<div class="panel"/>'
-        + '<div class="panel"/>'
-        + '<div class="panel"/>'
+    var accordionHTML = '<div class="accordion">'
+        + '<div class="card"/>'
+        + '<div class="card"/>'
+        + '<div class="card"/>'
         + '</div>'
-    var $groups = $(accordionHTML).appendTo('#qunit-fixture').find('.panel')
+    var $groups = $(accordionHTML).appendTo('#qunit-fixture').find('.card')
 
     var $target1 = $('<a role="button" data-toggle="collapse" href="#body1" data-parent=".accordion"/>').appendTo($groups.eq(0))
 
@@ -371,12 +371,12 @@ $(function () {
     assert.expect(3)
     var done = assert.async()
 
-    var accordionHTML = '<div class="panel-group" id="accordion">'
-        + '<div class="panel"/>'
-        + '<div class="panel"/>'
-        + '<div class="panel"/>'
+    var accordionHTML = '<div id="accordion">'
+        + '<div class="card"/>'
+        + '<div class="card"/>'
+        + '<div class="card"/>'
         + '</div>'
-    var $groups = $(accordionHTML).appendTo('#qunit-fixture').find('.panel')
+    var $groups = $(accordionHTML).appendTo('#qunit-fixture').find('.card')
 
     var $target1 = $('<a role="button" data-toggle="collapse" href="#body1" data-parent="#accordion"/>').appendTo($groups.eq(0))
 
@@ -406,11 +406,11 @@ $(function () {
     var done = assert.async()
 
     var accordionHTML = '<div id="accordion">'
-        + '<div class="panel"/>'
-        + '<div class="panel"/>'
+        + '<div class="card"/>'
+        + '<div class="card"/>'
         + '</div>'
     var showFired = false
-    var $groups   = $(accordionHTML).appendTo('#qunit-fixture').find('.panel')
+    var $groups   = $(accordionHTML).appendTo('#qunit-fixture').find('.card')
 
     var $target1 = $('<a role="button" data-toggle="collapse" href="#body1" data-parent="#accordion"/>').appendTo($groups.eq(0))
 
diff --git a/js/tests/visual/collapse.html b/js/tests/visual/collapse.html
index 57c5562c0..3208069cb 100644
--- a/js/tests/visual/collapse.html
+++ b/js/tests/visual/collapse.html
@@ -13,47 +13,47 @@
 
   <h1>Collapse <small>Bootstrap Visual Test</small></h1>
 
-  <div class="panel-group" id="accordion">
-    <div class="panel panel-default">
-      <div class="panel-heading">
-        <h4 class="panel-title">
+  <div id="accordion">
+    <div class="card">
+      <div class="card-header">
+        <h5 class="m-b-0">
           <a role="button" data-toggle="collapse" data-parent="#accordion" href="#collapseOne">
             Collapsible Group Item #1
           </a>
-        </h4>
+        </h5>
       </div>
-      <div id="collapseOne" class="panel-collapse collapse in">
-        <div class="panel-body">
-          Anim pariatur cliche reprehenderit, enim eiusmod high life accusamus terry richardson ad squid. 3 wolf moon officia aute, non cupidatat skateboard dolor brunch. Food truck quinoa nesciunt laborum eiusmod. Brunch 3 wolf moon tempor, sunt aliqua put a bird on it squid single-origin coffee nulla assumenda shoreditch et. Nihil anim keffiyeh helvetica, craft beer labore wes anderson cred nesciunt sapiente ea proident. Ad vegan excepteur butcher vice lomo. Leggings occaecat craft beer farm-to-table, raw denim aesthetic synth nesciunt you probably haven't heard of them accusamus labore sustainable VHS.
-        </div>
+      <div id="collapseOne" class="collapse in">
+          <div class="card-block">
+            Anim pariatur cliche reprehenderit, enim eiusmod high life accusamus terry richardson ad squid. 3 wolf moon officia aute, non cupidatat skateboard dolor brunch. Food truck quinoa nesciunt laborum eiusmod. Brunch 3 wolf moon tempor, sunt aliqua put a bird on it squid single-origin coffee nulla assumenda shoreditch et. Nihil anim keffiyeh helvetica, craft beer labore wes anderson cred nesciunt sapiente ea proident. Ad vegan excepteur butcher vice lomo. Leggings occaecat craft beer farm-to-table, raw denim aesthetic synth nesciunt you probably haven't heard of them accusamus labore sustainable VHS.
+          </div>
       </div>
     </div>
-    <div class="panel panel-default">
-      <div class="panel-heading">
-        <h4 class="panel-title">
+    <div class="card">
+      <div class="card-header">
+        <h5 class="m-b-0">
           <a role="button" data-toggle="collapse" data-parent="#accordion" href="#collapseTwo">
             Collapsible Group Item #2
           </a>
-        </h4>
+        </h5>
       </div>
-      <div id="collapseTwo" class="panel-collapse collapse">
-        <div class="panel-body">
-          Anim pariatur cliche reprehenderit, enim eiusmod high life accusamus terry richardson ad squid. 3 wolf moon officia aute, non cupidatat skateboard dolor brunch. Food truck quinoa nesciunt laborum eiusmod. Brunch 3 wolf moon tempor, sunt aliqua put a bird on it squid single-origin coffee nulla assumenda shoreditch et. Nihil anim keffiyeh helvetica, craft beer labore wes anderson cred nesciunt sapiente ea proident. Ad vegan excepteur butcher vice lomo. Leggings occaecat craft beer farm-to-table, raw denim aesthetic synth nesciunt you probably haven't heard of them accusamus labore sustainable VHS.
-        </div>
+      <div id="collapseTwo" class="collapse">
+          <div class="card-block">
+            Anim pariatur cliche reprehenderit, enim eiusmod high life accusamus terry richardson ad squid. 3 wolf moon officia aute, non cupidatat skateboard dolor brunch. Food truck quinoa nesciunt laborum eiusmod. Brunch 3 wolf moon tempor, sunt aliqua put a bird on it squid single-origin coffee nulla assumenda shoreditch et. Nihil anim keffiyeh helvetica, craft beer labore wes anderson cred nesciunt sapiente ea proident. Ad vegan excepteur butcher vice lomo. Leggings occaecat craft beer farm-to-table, raw denim aesthetic synth nesciunt you probably haven't heard of them accusamus labore sustainable VHS.
+          </div>
       </div>
     </div>
-    <div class="panel panel-default">
-      <div class="panel-heading">
-        <h4 class="panel-title">
+    <div class="card">
+      <div class="card-header">
+        <h5 class="m-b-0">
           <a role="button" data-toggle="collapse" data-parent="#accordion" href="#collapseThree">
             Collapsible Group Item #3
           </a>
-        </h4>
+        </h5>
       </div>
-      <div id="collapseThree" class="panel-collapse collapse">
-        <div class="panel-body">
-          Anim pariatur cliche reprehenderit, enim eiusmod high life accusamus terry richardson ad squid. 3 wolf moon officia aute, non cupidatat skateboard dolor brunch. Food truck quinoa nesciunt laborum eiusmod. Brunch 3 wolf moon tempor, sunt aliqua put a bird on it squid single-origin coffee nulla assumenda shoreditch et. Nihil anim keffiyeh helvetica, craft beer labore wes anderson cred nesciunt sapiente ea proident. Ad vegan excepteur butcher vice lomo. Leggings occaecat craft beer farm-to-table, raw denim aesthetic synth nesciunt you probably haven't heard of them accusamus labore sustainable VHS.
-        </div>
+      <div id="collapseThree" class="collapse">
+          <div class="card-block">
+            Anim pariatur cliche reprehenderit, enim eiusmod high life accusamus terry richardson ad squid. 3 wolf moon officia aute, non cupidatat skateboard dolor brunch. Food truck quinoa nesciunt laborum eiusmod. Brunch 3 wolf moon tempor, sunt aliqua put a bird on it squid single-origin coffee nulla assumenda shoreditch et. Nihil anim keffiyeh helvetica, craft beer labore wes anderson cred nesciunt sapiente ea proident. Ad vegan excepteur butcher vice lomo. Leggings occaecat craft beer farm-to-table, raw denim aesthetic synth nesciunt you probably haven't heard of them accusamus labore sustainable VHS.
+          </div>
       </div>
     </div>
   </div>
diff --git a/js/tests/visual/modal.html b/js/tests/visual/modal.html
index bfc95ad5d..86c4a10ec 100644
--- a/js/tests/visual/modal.html
+++ b/js/tests/visual/modal.html
@@ -62,31 +62,31 @@
           <h4>Tooltips in a modal</h4>
           <p><a href="#" class="js-tooltip" title="Tooltip">This link</a> and <a href="#" class="js-tooltip" title="Tooltip">that link</a> should have tooltips on hover.</p>
 
-          <div class="panel-group" id="accordion" role="tablist" aria-multiselectable="true">
-            <div class="panel panel-default">
-              <div class="panel-heading" role="tab" id="headingOne">
-                <h4 class="panel-title">
+          <div id="accordion" role="tablist" aria-multiselectable="true">
+            <div class="card">
+              <div class="card-header" role="tab" id="headingOne">
+                <h5 class="m-b-0">
                   <a role="button" data-toggle="collapse" data-parent="#accordion" href="#collapseOne" aria-expanded="true" aria-controls="collapseOne">
                     Collapsible Group Item #1
                   </a>
-                </h4>
+                </h5>
               </div>
-              <div id="collapseOne" class="panel-collapse collapse in" role="tabpanel" aria-labelledby="headingOne">
-                <div class="panel-body">
+              <div id="collapseOne" class="collapse in" role="tabpanel" aria-labelledby="headingOne">
+                <div class="card-block">
                   Lorem ipsum
                 </div>
               </div>
             </div>
-            <div class="panel panel-default">
-              <div class="panel-heading" role="tab" id="headingTwo">
-                <h4 class="panel-title">
+            <div class="card">
+              <div class="card-header" role="tab" id="headingTwo">
+                <h5 class="m-b-0">
                   <a class="collapsed" role="button" data-toggle="collapse" data-parent="#accordion" href="#collapseTwo" aria-expanded="false" aria-controls="collapseTwo">
                     Collapsible Group Item #2
                   </a>
-                </h4>
+                </h5>
               </div>
-              <div id="collapseTwo" class="panel-collapse collapse" role="tabpanel" aria-labelledby="headingTwo">
-                <div class="panel-body">
+              <div id="collapseTwo" class="collapse" role="tabpanel" aria-labelledby="headingTwo">
+                <div class="card-block">
                   Anim pariatur cliche reprehenderit, enim eiusmod high life accusamus terry richardson ad squid. 3 wolf moon officia aute, non cupidatat skateboard dolor brunch. Food truck quinoa nesciunt laborum eiusmod. Brunch 3 wolf moon tempor, sunt aliqua put a bird on it squid single-origin coffee nulla assumenda shoreditch et. Nihil anim keffiyeh helvetica, craft beer labore wes anderson cred nesciunt sapiente ea proident. Ad vegan excepteur butcher vice lomo. Leggings occaecat craft beer farm-to-table, raw denim aesthetic synth nesciunt you probably haven't heard of them accusamus labore sustainable VHS.
                   Anim pariatur cliche reprehenderit, enim eiusmod high life accusamus terry richardson ad squid. 3 wolf moon officia aute, non cupidatat skateboard dolor brunch. Food truck quinoa nesciunt laborum eiusmod. Brunch 3 wolf moon tempor, sunt aliqua put a bird on it squid single-origin coffee nulla assumenda shoreditch et. Nihil anim keffiyeh helvetica, craft beer labore wes anderson cred nesciunt sapiente ea proident. Ad vegan excepteur butcher vice lomo. Leggings occaecat craft beer farm-to-table, raw denim aesthetic synth nesciunt you probably haven't heard of them accusamus labore sustainable VHS.
                   Anim pariatur cliche reprehenderit, enim eiusmod high life accusamus terry richardson ad squid. 3 wolf moon officia aute, non cupidatat skateboard dolor brunch. Food truck quinoa nesciunt laborum eiusmod. Brunch 3 wolf moon tempor, sunt aliqua put a bird on it squid single-origin coffee nulla assumenda shoreditch et. Nihil anim keffiyeh helvetica, craft beer labore wes anderson cred nesciunt sapiente ea proident. Ad vegan excepteur butcher vice lomo. Leggings occaecat craft beer farm-to-table, raw denim aesthetic synth nesciunt you probably haven't heard of them accusamus labore sustainable VHS.
@@ -175,7 +175,7 @@ function reportFirefoxTestResult(result) {
   if (!firefoxTestDone) {
     $('#ff-bug-test-result')
       .addClass(result ? 'text-success' : 'text-danger')
-      .text(result ? 'PASS' : 'FAIL')  
+      .text(result ? 'PASS' : 'FAIL')
   }
   firefoxTestDone = true
 }