Fix conflict

c3.js

@@ -2613,10 +2613,16 @@
         while (parent && parent.tagName !== 'BODY') {
             try {
                 v = parent.getBoundingClientRect()[key];
+            } catch(e) {
+                if (key === 'width') {
+                    // In IE in certain cases getBoundingClientRect
+                    // will cause an "unspecified error"
+                    v = parent.offsetWidth;
+                }
+            }
             if (v) {
                 break;
             }
-            } catch(e) {}
             parent = parent.parentNode;
         }
         return v;

src/size.js

@@ -46,10 +46,16 @@ c3_chart_internal_fn.getParentRectValue = function (key) {
     while (parent && parent.tagName !== 'BODY') {
         try {
             v = parent.getBoundingClientRect()[key];
+        } catch(e) {
+            if (key === 'width') {
+                // In IE in certain cases getBoundingClientRect
+                // will cause an "unspecified error"
+                v = parent.offsetWidth;
+            }
+        }
         if (v) {
             break;
         }
-        } catch(e) {}
         parent = parent.parentNode;
     }
     return v;