diff --git a/include/wx/gtk/webview_webkit.h b/include/wx/gtk/webview_webkit.h
index 02aabd4eb9..ed375d3a39 100644
--- a/include/wx/gtk/webview_webkit.h
+++ b/include/wx/gtk/webview_webkit.h
@@ -114,7 +114,7 @@ public:
     virtual wxString GetSelectedSource() const wxOVERRIDE;
     virtual void ClearSelection() wxOVERRIDE;
 
-    virtual bool RunScript(const wxString& javascript, wxString* output = NULL) wxOVERRIDE;
+    virtual bool RunScript(const wxString& javascript, wxString* output = NULL) const wxOVERRIDE;
 
     //Virtual Filesystem Support
     virtual void RegisterHandler(wxSharedPtr<wxWebViewHandler> handler) wxOVERRIDE;
@@ -161,7 +161,7 @@ private:
     bool CanExecuteEditingCommand(const gchar* command) const;
     void SetupWebExtensionServer();
     GDBusProxy *GetExtensionProxy() const;
-    bool RunScriptSync(const wxString& javascript, wxString* output = NULL);
+    bool RunScriptSync(const wxString& javascript, wxString* output = NULL) const;
 #endif
 
     WebKitWebView *m_web_view;
diff --git a/include/wx/msw/webview_edge.h b/include/wx/msw/webview_edge.h
index 01972b1e73..be7eeeac2a 100644
--- a/include/wx/msw/webview_edge.h
+++ b/include/wx/msw/webview_edge.h
@@ -89,7 +89,7 @@ public:
     virtual void EnableAccessToDevTools(bool enable = true) wxOVERRIDE;
     virtual bool IsAccessToDevToolsEnabled() const wxOVERRIDE;
 
-    virtual bool RunScript(const wxString& javascript, wxString* output = NULL) wxOVERRIDE;
+    virtual bool RunScript(const wxString& javascript, wxString* output = NULL) const wxOVERRIDE;
 
     virtual void RegisterHandler(wxSharedPtr<wxWebViewHandler> handler) wxOVERRIDE;
 
@@ -107,7 +107,7 @@ private:
 
     void OnShow(wxShowEvent& event);
 
-    bool RunScriptSync(const wxString& javascript, wxString* output = NULL);
+    bool RunScriptSync(const wxString& javascript, wxString* output = NULL) const;
 
     wxDECLARE_DYNAMIC_CLASS(wxWebViewEdge);
 };
diff --git a/include/wx/msw/webview_ie.h b/include/wx/msw/webview_ie.h
index 019ac97dbf..072b8aeb5a 100644
--- a/include/wx/msw/webview_ie.h
+++ b/include/wx/msw/webview_ie.h
@@ -131,7 +131,7 @@ public:
     virtual wxString GetSelectedSource() const wxOVERRIDE;
     virtual void ClearSelection() wxOVERRIDE;
 
-    virtual bool RunScript(const wxString& javascript, wxString* output = NULL) wxOVERRIDE;
+    virtual bool RunScript(const wxString& javascript, wxString* output = NULL) const wxOVERRIDE;
 
     //Virtual Filesystem Support
     virtual void RegisterHandler(wxSharedPtr<wxWebViewHandler> handler) wxOVERRIDE;
diff --git a/include/wx/osx/webview_webkit.h b/include/wx/osx/webview_webkit.h
index 6c9fa701f8..1c92faac73 100644
--- a/include/wx/osx/webview_webkit.h
+++ b/include/wx/osx/webview_webkit.h
@@ -88,7 +88,7 @@ public:
     virtual void SetEditable(bool enable = true) wxOVERRIDE;
     virtual bool IsEditable() const wxOVERRIDE;
 
-    bool RunScript(const wxString& javascript, wxString* output = NULL) wxOVERRIDE;
+    bool RunScript(const wxString& javascript, wxString* output = NULL) const wxOVERRIDE;
 
     //Virtual Filesystem Support
     virtual void RegisterHandler(wxSharedPtr<wxWebViewHandler> handler) wxOVERRIDE;
@@ -107,7 +107,7 @@ private:
     WX_NSObject m_navigationDelegate;
     WX_NSObject m_UIDelegate;
 
-    bool RunScriptSync(const wxString& javascript, wxString* output = NULL);
+    bool RunScriptSync(const wxString& javascript, wxString* output = NULL) const;
 };
 
 class WXDLLIMPEXP_WEBVIEW wxWebViewFactoryWebKit : public wxWebViewFactory
diff --git a/include/wx/webview.h b/include/wx/webview.h
index 740991a7bc..9a0997ab36 100644
--- a/include/wx/webview.h
+++ b/include/wx/webview.h
@@ -181,7 +181,7 @@ public:
     virtual void Print() = 0;
     virtual void RegisterHandler(wxSharedPtr<wxWebViewHandler> handler) = 0;
     virtual void Reload(wxWebViewReloadFlags flags = wxWEBVIEW_RELOAD_DEFAULT) = 0;
-    virtual bool RunScript(const wxString& javascript, wxString* output = NULL) = 0;
+    virtual bool RunScript(const wxString& javascript, wxString* output = NULL) const = 0;
     virtual void SetEditable(bool enable = true) = 0;
     void SetPage(const wxString& html, const wxString& baseUrl)
     {
@@ -250,7 +250,7 @@ protected:
 
     // Count the number of calls to RunScript() in order to prevent
     // the_same variable from being used twice in more than one call.
-    int m_runScriptCount;
+    mutable int m_runScriptCount;
 
 private:
     static void InitFactoryMap();
diff --git a/interface/wx/webview.h b/interface/wx/webview.h
index 1e46ebad43..98482df6d5 100644
--- a/interface/wx/webview.h
+++ b/interface/wx/webview.h
@@ -660,7 +660,7 @@ public:
             version 3.1.1.
         @return @true if there is a result, @false if there is an error.
     */
-    virtual bool RunScript(const wxString& javascript, wxString* output = NULL) = 0;
+    virtual bool RunScript(const wxString& javascript, wxString* output = NULL) const = 0;
 
     /**
         Set the editable property of the web control. Enabling allows the user
diff --git a/src/common/webview.cpp b/src/common/webview.cpp
index 21d5a40c92..d88771feb8 100644
--- a/src/common/webview.cpp
+++ b/src/common/webview.cpp
@@ -112,7 +112,7 @@ void wxWebView::SetZoom(wxWebViewZoom zoom)
 bool wxWebView::QueryCommandEnabled(const wxString& command) const
 {
     wxString resultStr;
-    const_cast<wxWebView*>(this)->RunScript(
+    RunScript(
         wxString::Format("function f(){ return document.queryCommandEnabled('%s'); } f();", command), &resultStr);
     return resultStr.IsSameAs("true", false);
 }
@@ -125,14 +125,14 @@ void wxWebView::ExecCommand(const wxString& command)
 wxString wxWebView::GetPageSource() const
 {
     wxString text;
-    const_cast<wxWebView*>(this)->RunScript("document.documentElement.outerHTML;", &text);
+    RunScript("document.documentElement.outerHTML;", &text);
     return text;
 }
 
 wxString wxWebView::GetPageText() const
 {
     wxString text;
-    const_cast<wxWebView*>(this)->RunScript("document.body.innerText;", &text);
+    RunScript("document.body.innerText;", &text);
     return text;
 }
 
@@ -169,7 +169,7 @@ void wxWebView::Paste()
 wxString wxWebView::GetSelectedText() const
 {
     wxString text;
-    const_cast<wxWebView*>(this)->RunScript("window.getSelection().toString();", &text);
+    RunScript("window.getSelection().toString();", &text);
     return text;
 }
 
@@ -187,7 +187,7 @@ void wxWebView::DeleteSelection()
 bool wxWebView::HasSelection() const
 {
     wxString rangeCountStr;
-    const_cast<wxWebView*>(this)->RunScript("window.getSelection().rangeCount;", &rangeCountStr);
+    RunScript("window.getSelection().rangeCount;", &rangeCountStr);
     return rangeCountStr != "0";
 }
 
diff --git a/src/gtk/webview_webkit.cpp b/src/gtk/webview_webkit.cpp
index 6765ecec70..28a73acb45 100644
--- a/src/gtk/webview_webkit.cpp
+++ b/src/gtk/webview_webkit.cpp
@@ -920,7 +920,7 @@ wxString wxWebViewWebKit::GetPageText() const
                     wxConvUTF8);
 }
 
-bool wxWebViewWebKit::RunScript(const wxString& javascript, wxString* output)
+bool wxWebViewWebKit::RunScript(const wxString& javascript, wxString* output) const
 {
     wxCHECK_MSG( m_web_view, false,
         wxS("wxWebView must be created before calling RunScript()") );
diff --git a/src/gtk/webview_webkit2.cpp b/src/gtk/webview_webkit2.cpp
index 6106610e92..8ee773b060 100644
--- a/src/gtk/webview_webkit2.cpp
+++ b/src/gtk/webview_webkit2.cpp
@@ -1130,7 +1130,7 @@ static void wxgtk_run_javascript_cb(GObject *,
 } // extern "C"
 
 // Run the given script synchronously and return its result in output.
-bool wxWebViewWebKit::RunScriptSync(const wxString& javascript, wxString* output)
+bool wxWebViewWebKit::RunScriptSync(const wxString& javascript, wxString* output) const
 {
     GAsyncResult *result = NULL;
     webkit_web_view_run_javascript(m_web_view,
@@ -1193,7 +1193,7 @@ bool wxWebViewWebKit::RunScriptSync(const wxString& javascript, wxString* output
     return true;
 }
 
-bool wxWebViewWebKit::RunScript(const wxString& javascript, wxString* output)
+bool wxWebViewWebKit::RunScript(const wxString& javascript, wxString* output) const
 {
     wxJSScriptWrapper wrapJS(javascript, &m_runScriptCount);
 
@@ -1240,7 +1240,7 @@ long wxWebViewWebKit::Find(const wxString& text, int flags)
 {
     WebKitFindController* findctrl = webkit_web_view_get_find_controller(m_web_view);
     bool newSearch = false;
-    if(text != m_findText || 
+    if(text != m_findText ||
        (flags & wxWEBVIEW_FIND_MATCH_CASE) != (m_findFlags & wxWEBVIEW_FIND_MATCH_CASE))
     {
         newSearch = true;
diff --git a/src/msw/webview_edge.cpp b/src/msw/webview_edge.cpp
index cce02e5f21..06b1f1126a 100644
--- a/src/msw/webview_edge.cpp
+++ b/src/msw/webview_edge.cpp
@@ -651,7 +651,7 @@ void wxWebViewEdge::MSWSetBrowserExecutableDir(const wxString & path)
     wxWebViewEdgeImpl::ms_browserExecutableDir = path;
 }
 
-bool wxWebViewEdge::RunScriptSync(const wxString& javascript, wxString* output)
+bool wxWebViewEdge::RunScriptSync(const wxString& javascript, wxString* output) const
 {
     bool scriptExecuted = false;
 
@@ -687,7 +687,7 @@ bool wxWebViewEdge::RunScriptSync(const wxString& javascript, wxString* output)
         return true;
 }
 
-bool wxWebViewEdge::RunScript(const wxString& javascript, wxString* output)
+bool wxWebViewEdge::RunScript(const wxString& javascript, wxString* output) const
 {
     wxJSScriptWrapper wrapJS(javascript, &m_runScriptCount);
 
diff --git a/src/msw/webview_ie.cpp b/src/msw/webview_ie.cpp
index 565d377bf3..a008166b6a 100644
--- a/src/msw/webview_ie.cpp
+++ b/src/msw/webview_ie.cpp
@@ -1029,7 +1029,7 @@ bool CallEval(const wxString& code,
     return scriptAO.Invoke("eval", DISPATCH_METHOD, *varResult, 1, &varCode);
 }
 
-bool wxWebViewIE::RunScript(const wxString& javascript, wxString* output)
+bool wxWebViewIE::RunScript(const wxString& javascript, wxString* output) const
 {
     wxCOMPtr<IHTMLDocument2> document(m_impl->GetDocument());
     if ( !document )
diff --git a/src/osx/webview_webkit.mm b/src/osx/webview_webkit.mm
index 3a0b485220..5350081e78 100644
--- a/src/osx/webview_webkit.mm
+++ b/src/osx/webview_webkit.mm
@@ -302,7 +302,7 @@ bool wxWebViewWebKit::CanSetZoomType(wxWebViewZoomType type) const
     }
 }
 
-bool wxWebViewWebKit::RunScriptSync(const wxString& javascript, wxString* output)
+bool wxWebViewWebKit::RunScriptSync(const wxString& javascript, wxString* output) const
 {
     __block bool scriptExecuted = false;
     __block wxString outputStr;
@@ -345,7 +345,7 @@ bool wxWebViewWebKit::RunScriptSync(const wxString& javascript, wxString* output
     return scriptSuccess;
 }
 
-bool wxWebViewWebKit::RunScript(const wxString& javascript, wxString* output)
+bool wxWebViewWebKit::RunScript(const wxString& javascript, wxString* output) const
 {
     wxJSScriptWrapper wrapJS(javascript, &m_runScriptCount);