new plugin cleanupEnableBackground

.svgo

@@ -54,6 +54,9 @@
             },{
                 "name": "removeViewBox",
                 "active": true
+            },{
+                "name": "cleanupEnableBackground",
+                "active": true
             },{
                 "name": "removeHiddenElems",
                 "active": true,

plugins/cleanupEnableBackground.js

@@ -0,0 +1,39 @@
+var regEnableBackground = /^new\s0\s0\s(\d+)\s(\d+)$/,
+    container = require('./_collections').elems.container;
+
+/**
+ * Remove or cleanup enable-background attr which coincides with a width/height box.
+ *
+ * @see http://www.w3.org/TR/SVG/filters.html#EnableBackgroundProperty
+ *
+ * @param {Object} item current iteration item
+ * @param {Object} params plugin params
+ * @return {Boolean} if false, item will be filtered out
+ *
+ * @author Kir Belevich
+ */
+exports.cleanupEnableBackground = function(item, params) {
+
+    if (
+        item.isElem(container) &&
+        item.hasAttr('enable-background') &&
+        item.hasAttr('width') &&
+        item.hasAttr('height')
+    ) {
+
+        if (match = item.attr('enable-background').value.match(regEnableBackground)) {
+            if (
+                item.attr('width').value == match[1] &&
+                item.attr('height').value == match[2]
+            ) {
+                if (item.isElem('svg')) {
+                    item.removeAttr('enable-background');
+                } else {
+                    item.attr('enable-background').value = 'new';
+                }
+            }
+        }
+
+    }
+
+};