custom swicth possible fix

Author: coliff

css/bootstrap-ie9.css

@@ -251,3 +251,6 @@ aside,
 .form-group > .is-invalid:focus {
   box-shadow: 0 0 0 0.2rem rgba(220, 53, 69, 0.25);
 }
+.custom-switch .custom-control-input:checked ~ .custom-control-label:after {
+  -ms-transform: translateX(0.75rem);
+}

test.htm

@@ -804,6 +804,10 @@ <h1>Forms</h1>
                   <span class="custom-file-control"></span>
                 </label>
               </div>
+              <div class="custom-control custom-switch">
+                <input type="checkbox" class="custom-control-input" id="customSwitch1">
+                <label class="custom-control-label" for="customSwitch1">Toggle this switch element</label>
+              </div>
             </fieldset>
           </div>
         </div>
@@ -1835,7 +1839,7 @@ <h4 class="modal-title">modal-lg</h4>
         </div>
       </div>
     </div>
-    
+
     <div id="source-modal-xl" class="modal fade">
       <div class="modal-dialog modal-xl">
         <div class="modal-content">