Issue #3414508 by Grimreaper: Enable Gitlab CI + Update README + coding standards

Closes #3414508

css/tabbingmanager.visualize.css

@@ -10,24 +10,10 @@
   }
 }
 
-@-webkit-keyframes webkit-tabbingmanager-visualize-pulse {
-  0% {
-    -webkit-box-shadow: 0 0 5px #f00, 0 0 15px 0 white;
-  }
-  50% {
-    -webkit-box-shadow: 0 0 15px 15px #f00, 0 0 15px 25px rgba(255, 255, 255, 0.4);
-  }
-  100% {
-    -webkit-box-shadow: 0 0 5px #f00, 0 0 15px 0 white;
-  }
-}
-
 .tabbingmanager-visualize-tabbable {
-  -webkit-animation: webkit-tabbingmanager-visualize-pulse 1s;
   animation: tabbingmanager-visualize-pulse 1s;
-  box-shadow: inset 0 0 5px 3px #f00 !important;
+  box-shadow: inset 0 0 5px 3px #f00;
 }
 .tabbingmanager-visualize-tabbable:focus {
-  animation: tabbingmanager-visualize-pulse 5s;
   box-shadow: inset 0 0 5px 3px #00f, 0 0 10px 6px #00f !important;
 }