Issue 2409 - Improved accessibility of tabs in options page

skin/new-options.css

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2016 Eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 180 matching lines @@
 {
   list-style: none;
   margin: 0px;
   position: relative;
   padding: 0px;
   width: 198px;
 }
 
 .tabs.vertical li
 {
+  height: 46px;
+  margin-top: -1px;
+  -moz-margin-end: -1px;
+  -webkit-margin-end: -1px;
+  -moz-margin-start: -1px;
+  -webkit-margin-start: -1px;
   border-color: #CDCDCD transparent;
   border-style: solid;
   border-width: 1px;
   font-size: 16px;
   font-weight: 300;
   line-height: 1em;
-  margin-top: -1px;
-  padding: 14px 20px;
 }
 
-body[data-tab|="general"] #tab-general,
-body[data-tab|="advanced"] #tab-advanced,
-body[data-tab|="help"] #tab-help
+.tabs.vertical li a,
+.tabs.vertical li span,
+.tabs.vertical li::after
 {
-  background-color: #FFFFFF;
+  margin: auto 20px;
+}
+
+.tabs li[role="tab"]:focus
+{
+  outline: none;
+  text-shadow: 0px 0px 1px #888;
+}
+
+.tabs li[role="tab"][aria-selected]
+{
   border-radius: 3px 0px 0px 3px;
-  border-width: 1px;
-  font-weight: 600;
   -moz-border-start-color: #CDCDCD;
   -webkit-border-start-color: #CDCDCD;
-  -moz-margin-end: -1px;
-  -webkit-margin-end: -1px;
-  -moz-margin-start: -1px;
-  -webkit-margin-start: -1px;
-  -moz-padding-end: 21px;
-  -webkit-padding-end: 21px;
-  -moz-padding-start: 21px;
-  -webkit-padding-start: 21px;
+  font-weight: 600;
+  background-color: #FFF;
 }
 
-html[dir="rtl"] body[data-tab|="general"] #tab-general,
-html[dir="rtl"] body[data-tab|="advanced"] #tab-advanced,
-html[dir="rtl"] body[data-tab|="help"] #tab-help
+html[dir="rtl"] .tabs li[role="tab"][aria-selected]
 {
   border-radius: 0px 3px 3px 0px;
 }
 
 .tabs.vertical.bottom
 {
   bottom: 0px;
   position: absolute;
 }
 
 .tabs.vertical.bottom li:first-child
 {
   border-top: 0px;
 }
 
 #tab-contribute
 {
   border-bottom: none;
 }
 
-#nav-sidebar ul li .icon
+#nav-sidebar ul li span
 {
-  height: 14px;
-  width: 14px;
+  width: 100%;
 }
 
-#tab-general .icon
+#nav-sidebar ul li::after
+{
+  content: "";
+  min-width: 14px;
+  height: 14px;
+  background-image: url(options-sprite.png);
+}
+
+#tab-general::after
 {
   background-position: -16px -18px;
 }
 
-#tab-advanced .icon
+#tab-advanced::after
 {
   background-position: -46px -18px;
 }
 
-#tab-help .icon
+#tab-help::after
 {
   background-position: -1px -18px;
 }
 
-#tab-share .icon
+#tab-share::after
 {
   background-position: -61px -18px;
 }
 
-#tab-contribute .icon
+#tab-contribute::after
 {
   background-position: -31px -18px;
 }
 
 #tab-share:lang(zh),
 #tab-share[hidden]
 {
   display: none;
 }
 
@@ skipping 1028 matching lines @@
 #other-language .button-add::before
 {
   display: none;
 }
 
 #other-language .display
 {
   -webkit-margin-start: 10px;
   -moz-margin-start: 10px;
 }