Integrates and moves improved CSS for outline.

unpacked/extensions/MathMenu.js

@@ -193,12 +193,6 @@
       },
       ".MathJax_MenuClose:hover span": {
         "background-color":"#CCC!important"
-      },
-      ".MathJax:focus": {
-        display:"inline-block",
-        outline:"none",
-        border:"1px dotted",
-        margin:"-1px"
       }
     }
   });

unpacked/jax/output/HTML-CSS/jax.js

@@ -344,7 +344,23 @@
         "#MathJax_Tooltip *": {
           filter: "none", opacity:1, background:"transparent" // for IE
         },
-        
+
+        // Focus elements for keyboard tabbing.
+        ".MathJax:focus": (
+          (MathJax.Hub.Browser.isSafari || MathJax.Hub.Browser.isChrome) ? {
+            display:"inline-block",
+            outline:"none",
+            margin:"-3px",
+            padding:"3px",
+            "-webkit-box-shadow": "0px 0px 5px #345, inset 0px 0px 5px #345",
+            "box-shadow": "0px 0px 5px #345, inset 0px 0px 5px #345"
+          } : {
+            display:"inline-block",
+            outline:"none",
+            border:"1px dotted",
+            margin:"-1px"
+          }),
+
         //
         //  Used for testing web fonts against the default font used while
         //  web fonts are loading