Build

c3.css

@@ -1,7 +1,7 @@
 /*-- Chart --*/
 .c3 svg {
   font: 10px sans-serif;
-  -webkit-tap-highlight-color: rgba(0, 0, 0, 0); }
+  -webkit-tap-highlight-color: transparent; }
 
 .c3 path, .c3 line {
   fill: none;
@@ -12,7 +12,11 @@
   -moz-user-select: none;
   user-select: none; }
 
-.c3-legend-item-tile, .c3-xgrid-focus, .c3-ygrid, .c3-event-rect, .c3-bars path {
+.c3-legend-item-tile,
+.c3-xgrid-focus,
+.c3-ygrid,
+.c3-event-rect,
+.c3-bars path {
   shape-rendering: crispEdges; }
 
 .c3-chart-arc path {
@@ -71,11 +75,11 @@
 /*-- Region --*/
 .c3-region {
   fill: steelblue;
-  fill-opacity: 0.1; }
+  fill-opacity: .1; }
 
 /*-- Brush --*/
 .c3-brush .extent {
-  fill-opacity: 0.1; }
+  fill-opacity: .1; }
 
 /*-- Select - Drag --*/
 /*-- Legend --*/

c3.js

@@ -4187,6 +4187,10 @@
                     }
                 }
             })
+            .on('dblclick', function(id){
+                $$.api.hide();
+                $$.api.show(id);
+            })
             .on('mouseover', function (id) {
                 if (config.legend_item_onmouseover) {
                     config.legend_item_onmouseover.call($$, id);