new plugin removeViewBox

.svgo

@@ -51,6 +51,9 @@
                     "version": true,
                     "xmlspace": true
                 }
+            },{
+                "name": "removeViewBox",
+                "active": true
             },{
                 "name": "removeHiddenElems",
                 "active": true,

plugins/removeViewBox.js

@@ -0,0 +1,35 @@
+var regViewBox = /^0\s0\s(\d+)\s(\d+)$/,
+    viewBoxElems = ['svg', 'marker', 'pattern', 'symbol', 'view'];
+
+/**
+ * Remove viewBox attr which coincides with a width/height box.
+ *
+ * @see http://www.w3.org/TR/SVG/coords.html#ViewBoxAttribute
+ *
+ * @param {Object} item current iteration item
+ * @param {Object} params plugin params
+ * @return {Boolean} if false, item will be filtered out
+ *
+ * @author Kir Belevich
+ */
+exports.removeViewBox = function(item, params) {
+
+    if (
+        item.isElem(viewBoxElems) &&
+        item.hasAttr('viewBox') &&
+        item.hasAttr('width') &&
+        item.hasAttr('height')
+    ) {
+
+        if (match = item.attr('viewBox').value.match(regViewBox)) {
+            if (
+                item.attr('width').value == match[1] &&
+                item.attr('height').value == match[2]
+            ) {
+                item.removeAttr('viewBox');
+            }
+        }
+
+    }
+
+};