setViewBox() does not work properly for papers, having size in percents

dev/raphael.core.js

@@ -3500,6 +3500,21 @@
         return out;
     };
     /*\
+     * Paper.getSize
+     [ method ]
+     **
+     * Obtains current paper actual size.
+     **
+     = (object)
+     \*/
+    paperproto.getSize = function () {
+        var container = this.canvas.parentNode;
+        return {
+            width: container.offsetWidth,
+            height: container.offsetHeight
+                };
+        };
+    /*\
      * Paper.setSize
      [ method ]
      **

dev/raphael.svg.js

@@ -1290,7 +1290,8 @@ window.Raphael && window.Raphael.svg && function(R) {
     };
     R._engine.setViewBox = function (x, y, w, h, fit) {
         eve("raphael.setViewBox", this, this._viewBox, [x, y, w, h, fit]);
-        var size = mmax(w / this.width, h / this.height),
+        var paperSize = this.getSize(),
+            size = mmax(w / paperSize.width, h / paperSize.height),
             top = this.top,
             aspectRatio = fit ? "xMidYMid meet" : "xMinYMin",
             vb,

dev/raphael.vml.js

@@ -885,9 +885,9 @@ window.Raphael && window.Raphael.vml && function(R) {
     };
     R._engine.setViewBox = function (x, y, w, h, fit) {
         R.eve("raphael.setViewBox", this, this._viewBox, [x, y, w, h, fit]);
-        var width = this.width,
-            height = this.height,
-            size = 1 / mmax(w / width, h / height),
+        var paperSize = this.getSize(),
+            width = paperSize.width,
+            height = paperSize.height,
             H, W;
         if (fit) {
             H = height / h;

raphael.js

@@ -3879,6 +3879,21 @@
         return out;
     };
     /*\
+     * Paper.getSize
+     [ method ]
+     **
+     * Obtains current paper actual size.
+     **
+     = (object)
+     \*/
+    paperproto.getSize = function () {
+        var container = this.canvas.parentNode;
+        return {
+            width: container.offsetWidth,
+            height: container.offsetHeight
+                };
+        };
+    /*\
      * Paper.setSize
      [ method ]
      **
@@ -7090,7 +7105,8 @@
     };
     R._engine.setViewBox = function (x, y, w, h, fit) {
         eve("raphael.setViewBox", this, this._viewBox, [x, y, w, h, fit]);
-        var size = mmax(w / this.width, h / this.height),
+        var paperSize = this.getSize(),
+            size = mmax(w / paperSize.width, h / paperSize.height),
             top = this.top,
             aspectRatio = fit ? "xMidYMid meet" : "xMinYMin",
             vb,
@@ -8084,9 +8100,9 @@
     };
     R._engine.setViewBox = function (x, y, w, h, fit) {
         R.eve("raphael.setViewBox", this, this._viewBox, [x, y, w, h, fit]);
-        var width = this.width,
-            height = this.height,
-            size = 1 / mmax(w / width, h / height),
+        var paperSize = this.getSize(),
+            width = paperSize.width,
+            height = paperSize.height,
             H, W;
         if (fit) {
             H = height / h;