diff --git a/docs/changes.txt b/docs/changes.txt
index f3e82d2dce..7b2980dd0c 100644
--- a/docs/changes.txt
+++ b/docs/changes.txt
@@ -105,6 +105,7 @@ All:
 
 All (GUI):
 
+- Allow wxWebView::RunScript() return values (Jose Lorenzo, GSoC 2017).
 - Allow using fractional pen widths with wxGraphicsContext (Adrien Tétar).
 - Improve wxSVGFileDC to support more of wxDC API (Maarten Bent).
 - Add support for wxAuiManager and wxAuiPaneInfo to XRC (Andrea Zanellato).
diff --git a/include/wx/gtk/private/webkit.h b/include/wx/gtk/private/webkit.h
new file mode 100644
index 0000000000..1a1025ffc5
--- /dev/null
+++ b/include/wx/gtk/private/webkit.h
@@ -0,0 +1,70 @@
+///////////////////////////////////////////////////////////////////////////////
+// Name:        wx/gtk/private/webkit.h
+// Purpose:     wxWebKitGtk RAII wrappers declaration
+// Author:      Jose Lorenzo
+// Created:     2017-08-21
+// Copyright:   (c) 2017 Jose Lorenzo <josee.loren@gmail.com>
+// Licence:     wxWindows licence
+///////////////////////////////////////////////////////////////////////////////
+
+#ifndef _WX_GTK_PRIVATE_WEBKIT_H_
+#define _WX_GTK_PRIVATE_WEBKIT_H_
+
+#include "wx/buffer.h"
+
+#include <webkit2/webkit2.h>
+#include <JavaScriptCore/JSStringRef.h>
+
+// ----------------------------------------------------------------------------
+// RAII wrapper of WebKitJavascriptResult taking care of freeing it
+// ----------------------------------------------------------------------------
+
+class wxWebKitJavascriptResult
+{
+public:
+    explicit wxWebKitJavascriptResult(WebKitJavascriptResult *r)
+        : m_jsresult(r)
+    {
+    }
+
+    ~wxWebKitJavascriptResult()
+    {
+        webkit_javascript_result_unref(m_jsresult);
+    }
+
+    operator WebKitJavascriptResult *() const { return m_jsresult; }
+
+private:
+    WebKitJavascriptResult *m_jsresult;
+
+    wxDECLARE_NO_COPY_CLASS(wxWebKitJavascriptResult);
+};
+
+// ----------------------------------------------------------------------------
+// RAII wrapper of JSStringRef, also providing conversion to wxString
+// ----------------------------------------------------------------------------
+
+class wxJSStringRef
+{
+public:
+    explicit wxJSStringRef(JSStringRef r) : m_jssref(r) { }
+    ~wxJSStringRef() { JSStringRelease(m_jssref); }
+
+    wxString ToWxString() const
+    {
+        const size_t length = JSStringGetMaximumUTF8CStringSize(m_jssref);
+
+        wxCharBuffer str(length);
+
+        JSStringGetUTF8CString(m_jssref, str.data(), length);
+
+        return wxString::FromUTF8(str);
+    }
+
+private:
+    JSStringRef m_jssref;
+
+    wxDECLARE_NO_COPY_CLASS(wxJSStringRef);
+};
+
+#endif // _WX_GTK_PRIVATE_WEBKIT_H_
diff --git a/include/wx/gtk/webview_webkit.h b/include/wx/gtk/webview_webkit.h
index 95a5bac4e4..fa61f06ca5 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 void RunScript(const wxString& javascript) wxOVERRIDE;
+    virtual bool RunScript(const wxString& javascript, wxString* output = NULL) wxOVERRIDE;
 
     //Virtual Filesystem Support
     virtual void RegisterHandler(wxSharedPtr<wxWebViewHandler> handler) wxOVERRIDE;
@@ -160,6 +160,7 @@ private:
 #if wxUSE_WEBVIEW_WEBKIT2
     bool CanExecuteEditingCommand(const gchar* command) const;
     void SetupWebExtensionServer();
+    bool RunScriptSync(const wxString& javascript, wxString* output = NULL);
 #endif
 
     WebKitWebView *m_web_view;
diff --git a/include/wx/msw/webview_ie.h b/include/wx/msw/webview_ie.h
index a2b8f891ea..1c9d154bae 100644
--- a/include/wx/msw/webview_ie.h
+++ b/include/wx/msw/webview_ie.h
@@ -24,6 +24,7 @@
 #include "wx/msw/webview_missing.h"
 #include "wx/sharedptr.h"
 #include "wx/vector.h"
+#include "wx/msw/private.h"
 
 struct IHTMLDocument2;
 struct IHTMLElement;
@@ -121,7 +122,7 @@ public:
     virtual wxString GetSelectedSource() const wxOVERRIDE;
     virtual void ClearSelection() wxOVERRIDE;
 
-    virtual void RunScript(const wxString& javascript) wxOVERRIDE;
+    virtual bool RunScript(const wxString& javascript, wxString* output = NULL) wxOVERRIDE;
 
     //Virtual Filesystem Support
     virtual void RegisterHandler(wxSharedPtr<wxWebViewHandler> handler) wxOVERRIDE;
@@ -143,6 +144,10 @@ public:
     void onActiveXEvent(wxActiveXEvent& evt);
     void onEraseBg(wxEraseEvent&) {}
 
+    // Establish sufficiently modern emulation level for the browser control to
+    // allow RunScript() to return any kind of values.
+    static bool MSWSetModernEmulationLevel(bool modernLevel = true);
+
     wxDECLARE_EVENT_TABLE();
 
 protected:
diff --git a/include/wx/osx/webview_webkit.h b/include/wx/osx/webview_webkit.h
index 14b566966f..dc54ec061c 100644
--- a/include/wx/osx/webview_webkit.h
+++ b/include/wx/osx/webview_webkit.h
@@ -112,7 +112,7 @@ public:
     virtual wxString GetSelectedSource() const wxOVERRIDE;
     virtual void ClearSelection() wxOVERRIDE;
 
-    void RunScript(const wxString& javascript) wxOVERRIDE;
+    bool RunScript(const wxString& javascript, wxString* output = NULL) wxOVERRIDE;
 
     //Virtual Filesystem Support
     virtual void RegisterHandler(wxSharedPtr<wxWebViewHandler> handler) wxOVERRIDE;
diff --git a/include/wx/private/jsscriptwrapper.h b/include/wx/private/jsscriptwrapper.h
new file mode 100644
index 0000000000..7fd036302a
--- /dev/null
+++ b/include/wx/private/jsscriptwrapper.h
@@ -0,0 +1,167 @@
+///////////////////////////////////////////////////////////////////////////////
+// Name:        wx/private/jsscriptwrapper.h
+// Purpose:     JS Script Wrapper for wxWebView
+// Author:      Jose Lorenzo
+// Created:     2017-08-12
+// Copyright:   (c) 2017 Jose Lorenzo <josee.loren@gmail.com>
+// Licence:     wxWindows licence
+///////////////////////////////////////////////////////////////////////////////
+
+#ifndef _WX_PRIVATE_JSSCRIPTWRAPPER_H_
+#define _WX_PRIVATE_JSSCRIPTWRAPPER_H_
+
+#include "wx/regex.h"
+
+// ----------------------------------------------------------------------------
+// Helper for wxWebView::RunScript()
+// ----------------------------------------------------------------------------
+
+// This class provides GetWrappedCode(), GetOutputCode() and GetCleanUpCode()
+// functions that should be executed in the backend-appropriate way by each
+// wxWebView implementation in order to actually execute the user-provided
+// JavaScript code, retrieve its result (if it executed successfully) and
+// perform the cleanup at the end.
+class wxJSScriptWrapper
+{
+public:
+    wxJSScriptWrapper(const wxString& js, int* runScriptCount)
+        : m_escapedCode(js)
+    {
+        // We assign the return value of JavaScript snippet we execute to the
+        // variable with this name in order to be able to access it later if
+        // needed.
+        //
+        // Note that we use a different name for it for each call to
+        // RunScript() (which creates a new wxJSScriptWrapper every time) to
+        // avoid any possible conflict between different calls.
+        m_outputVarName = wxString::Format("__wxOut%i", (*runScriptCount)++);
+
+        // Adds one escape level if there is a single quote, double quotes or
+        // escape characters
+        wxRegEx escapeDoubleQuotes("(\\\\*)(['\"\n\r\v\t\b\f])");
+        escapeDoubleQuotes.Replace(&m_escapedCode,"\\1\\1\\\\\\2");
+    }
+
+    // Get the code to execute, its returned value will be either boolean true,
+    // if it executed successfully, or the exception message if an error
+    // occurred.
+    //
+    // Execute GetOutputCode() later to get the real output after successful
+    // execution of this code.
+    wxString GetWrappedCode() const
+    {
+        return wxString::Format
+               (
+                "try { var %s = eval(\"%s\"); true; } "
+                "catch (e) { e.name + \": \" + e.message; }",
+                m_outputVarName,
+                m_escapedCode
+               );
+    }
+
+    // Get code returning the result of the last successful execution of the
+    // code returned by GetWrappedCode().
+    wxString GetOutputCode() const
+    {
+#if wxUSE_WEBVIEW && wxUSE_WEBVIEW_WEBKIT && defined(__WXOSX__)
+        return wxString::Format
+               (
+                "if (typeof %s == 'object') JSON.stringify(%s);"
+                "else if (typeof %s == 'undefined') 'undefined';"
+                "else %s;",
+                m_outputVarName,
+                m_outputVarName,
+                m_outputVarName,
+                m_outputVarName
+               );
+#elif wxUSE_WEBVIEW && wxUSE_WEBVIEW_IE
+        return wxString::Format
+               (
+                "try {"
+                    "(%s == null || typeof %s != 'object') ? String(%s)"
+                                                          ": JSON.stringify(%s);"
+                "}"
+                "catch (e) {"
+                    "try {"
+                        "function __wx$stringifyJSON(obj) {"
+                            "if (!(obj instanceof Object))"
+                                "return typeof obj === \"string\""
+                                    "? \'\"\' + obj + \'\"\'"
+                                    ": \'\' + obj;"
+                            "else if (obj instanceof Array) {"
+                                "if (obj[0] === undefined)"
+                                    "return \'[]\';"
+                                "else {"
+                                    "var arr = [];"
+                                    "for (var i = 0; i < obj.length; i++)"
+                                        "arr.push(__wx$stringifyJSON(obj[i]));"
+                                    "return \'[\' + arr + \']\';"
+                                "}"
+                            "}"
+                            "else if (typeof obj === \"object\") {"
+                                "if (obj instanceof Date) {"
+                                    "if (!Date.prototype.toISOString) {"
+                                        "(function() {"
+                                            "function pad(number) {"
+                                                "return number < 10"
+                                                    "? '0' + number"
+                                                    ": number;"
+                                            "}"
+                                            "Date.prototype.toISOString = function() {"
+                                                "return this.getUTCFullYear() +"
+                                                    "'-' + pad(this.getUTCMonth() + 1) +"
+                                                    "'-' + pad(this.getUTCDate()) +"
+                                                    "'T' + pad(this.getUTCHours()) +"
+                                                    "':' + pad(this.getUTCMinutes()) +"
+                                                    "':' + pad(this.getUTCSeconds()) +"
+                                                    "'.' + (this.getUTCMilliseconds() / 1000)"
+                                                            ".toFixed(3).slice(2, 5) + 'Z\"';"
+                                            "};"
+                                        "}());"
+                                    "}"
+                                    "return '\"' + obj.toISOString(); + '\"'"
+                                "}"
+                                "var objElements = [];"
+                                "for (var key in obj)"
+                                "{"
+                                    "if (typeof obj[key] === \"function\")"
+                                        "return \'{}\';"
+                                    "else {"
+                                        "objElements.push(\'\"\'"
+                                            "+ key + \'\":\' +"
+                                            "__wx$stringifyJSON(obj[key]));"
+                                    "}"
+                                "}"
+                                "return \'{\' + objElements + \'}\';"
+                            "}"
+                        "}"
+                        "__wx$stringifyJSON(%s);"
+                    "}"
+                    "catch (e) { e.name + \": \" + e.message; }"
+                "}",
+                m_outputVarName,
+                m_outputVarName,
+                m_outputVarName,
+                m_outputVarName,
+                m_outputVarName
+               );
+#else
+        return m_outputVarName;
+#endif
+    }
+
+    // Execute the code returned by this function to let the output of the code
+    // we executed be garbage-collected.
+    wxString GetCleanUpCode() const
+    {
+        return wxString::Format("%s = undefined;", m_outputVarName);
+    }
+
+private:
+    wxString m_escapedCode;
+    wxString m_outputVarName;
+
+    wxDECLARE_NO_COPY_CLASS(wxJSScriptWrapper);
+};
+
+#endif // _WX_PRIVATE_JSSCRIPTWRAPPER_H_
diff --git a/include/wx/webview.h b/include/wx/webview.h
index 4f18bada70..d83f9a84f1 100644
--- a/include/wx/webview.h
+++ b/include/wx/webview.h
@@ -117,6 +117,7 @@ public:
     wxWebView()
     {
         m_showMenu = true;
+        m_runScriptCount = 0;
     }
 
     virtual ~wxWebView() {}
@@ -161,7 +162,7 @@ public:
     virtual void Print() = 0;
     virtual void RegisterHandler(wxSharedPtr<wxWebViewHandler> handler) = 0;
     virtual void Reload(wxWebViewReloadFlags flags = wxWEBVIEW_RELOAD_DEFAULT) = 0;
-    virtual void RunScript(const wxString& javascript) = 0;
+    virtual bool RunScript(const wxString& javascript, wxString* output = NULL) = 0;
     virtual void SetEditable(bool enable = true) = 0;
     void SetPage(const wxString& html, const wxString& baseUrl)
     {
@@ -223,6 +224,10 @@ public:
 protected:
     virtual void DoSetPage(const wxString& html, const wxString& baseUrl) = 0;
 
+    // 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;
+
 private:
     static void InitFactoryMap();
     static wxStringWebViewFactoryMap::iterator FindFactory(const wxString &backend);
diff --git a/interface/wx/webview.h b/interface/wx/webview.h
index d9e93e55b7..148d427360 100644
--- a/interface/wx/webview.h
+++ b/interface/wx/webview.h
@@ -460,11 +460,98 @@ public:
     virtual void Reload(wxWebViewReloadFlags flags = wxWEBVIEW_RELOAD_DEFAULT) = 0;
 
     /**
-        Runs the given javascript code.
-        @note When using wxWEBVIEW_BACKEND_IE you must wait for the current
-              page to finish loading before calling RunScript().
+        Sets emulation level to more modern level.
+
+        This function is useful to enable some minimally modern emulation level
+        of the system browser control used for wxWebView implementation under
+        MSW, rather than using the currently default, IE7-compatible,
+        emulation level. Currently the modern emulation level is only IE8, but
+        this could change in the future and shouldn't be relied on.
+
+        Please notice that this function works by modifying the per-user part
+        of MSW registry, which has several implications: first, it is
+        sufficient to call it only once (per user) as the changes done by it
+        are persistent and, second, if you do not want them to be persistent,
+        you need to call it with @false argument explicitly.
+
+        In particular, this function should be called to allow RunScript() to
+        work for JavaScript code returning arbitrary objects, which is not
+        supported at the default emulation level.
+
+        This function is MSW-specific and doesn't exist under other platforms.
+
+        See https://msdn.microsoft.com/en-us/library/ee330730#browser_emulation
+        for more information about browser control emulation levels.
+
+        @param modernLevel @true to set level to a level modern enough to allow
+            all wxWebView features to work (currently IE8), @false to reset the
+            emulation level to its default, compatible value.
+        @return @true on success, @false on failure (a warning message is also
+            logged in the latter case).
+
+        @since 3.1.1
     */
-    virtual void RunScript(const wxString& javascript) = 0;
+    bool MSWSetModernEmulationLevel(bool modernLevel = true);
+
+    /**
+        Runs the given JavaScript code.
+
+        JavaScript code is executed inside the browser control and has full
+        access to DOM and other browser-provided functionality. For example,
+        this code
+        @code
+            webview->RunScript("document.write('Hello from wxWidgets!')");
+        @endcode
+        will replace the current page contents with the provided string.
+
+        If @a output is non-null, it is filled with the result of executing
+        this code on success, e.g. a JavaScript value such as a string, a
+        number (integer or floating point), a boolean or JSON representation
+        for non-primitive types such as arrays and objects. For example:
+        @code
+            wxString result;
+            if ( webview->RunScript
+                          (
+                            "document.getElementById('some_id').innderHTML",
+                            &result
+                          ) )
+            {
+                ... result contains the contents of the given element ...
+            }
+            //else: the element with this ID probably doesn't exist.
+        @endcode
+
+        This function has a few platform-specific limitations:
+
+        - When using WebKit v1 in wxGTK2, retrieving the result of JavaScript
+          execution is unsupported and this function will always return false
+          if @a output is non-null to indicate this. This functionality is
+          fully supported when using WebKit v2 or later in wxGTK3.
+
+        - When using WebKit under macOS, code execution is limited to at most
+          10MiB of memory and 10 seconds of execution time.
+
+        - When using IE backend under MSW, scripts can only be executed when
+          the current page is fully loaded (i.e. @c wxEVT_WEBVIEW_LOADED event
+          was received). A script tag inside the page HTML is required in order
+          to run JavaScript.
+
+        Also notice that under MSW converting JavaScript objects to JSON is not
+        supported in the default emulation mode. wxWebView implements its own
+        object-to-JSON conversion as a fallback for this case, however it is
+        not as full-featured, well-tested or performing as the implementation
+        of this functionality in the browser control itself, so it is
+        recommended to use MSWSetModernEmulationLevel() to change emulation
+        level to a more modern one in which JSON conversion is done by the
+        control itself.
+
+        @param javascript JavaScript code to execute.
+        @param output Pointer to a string to be filled with the result value or
+            @NULL if it is not needed. This parameter is new since wxWidgets
+            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;
 
     /**
         Set the editable property of the web control. Enabling allows the user
diff --git a/samples/webview/webview.cpp b/samples/webview/webview.cpp
index 42234e1730..498a0fccd8 100644
--- a/samples/webview/webview.cpp
+++ b/samples/webview/webview.cpp
@@ -30,6 +30,9 @@
 #include "wx/notifmsg.h"
 #include "wx/settings.h"
 #include "wx/webview.h"
+#if wxUSE_WEBVIEW_IE
+#include "wx/msw/webview_ie.h"
+#endif
 #include "wx/webviewarchivehandler.h"
 #include "wx/webviewfshandler.h"
 #include "wx/infobar.h"
@@ -63,7 +66,7 @@ class WebApp : public wxApp
 {
 public:
     WebApp() :
-        m_url("http://www.wxwidgets.org")
+        m_url("https://www.wxwidgets.org")
     {
     }
 
@@ -115,6 +118,7 @@ public:
     void OnDocumentLoaded(wxWebViewEvent& evt);
     void OnNewWindow(wxWebViewEvent& evt);
     void OnTitleChanged(wxWebViewEvent& evt);
+    void OnSetPage(wxCommandEvent& evt);
     void OnViewSourceRequest(wxCommandEvent& evt);
     void OnViewTextRequest(wxCommandEvent& evt);
     void OnToolsClicked(wxCommandEvent& evt);
@@ -133,7 +137,23 @@ public:
     void OnScrollLineDown(wxCommandEvent&) { m_browser->LineDown(); }
     void OnScrollPageUp(wxCommandEvent&) { m_browser->PageUp(); }
     void OnScrollPageDown(wxCommandEvent&) { m_browser->PageDown(); }
-    void OnRunScript(wxCommandEvent& evt);
+    void RunScript(const wxString& javascript);
+    void OnRunScriptString(wxCommandEvent& evt);
+    void OnRunScriptInteger(wxCommandEvent& evt);
+    void OnRunScriptDouble(wxCommandEvent& evt);
+    void OnRunScriptBool(wxCommandEvent& evt);
+    void OnRunScriptObject(wxCommandEvent& evt);
+    void OnRunScriptArray(wxCommandEvent& evt);
+    void OnRunScriptDOM(wxCommandEvent& evt);
+    void OnRunScriptUndefined(wxCommandEvent& evt);
+    void OnRunScriptNull(wxCommandEvent& evt);
+    void OnRunScriptDate(wxCommandEvent& evt);
+#if wxUSE_WEBVIEW_IE
+    void OnRunScriptObjectWithEmulationLevel(wxCommandEvent& evt);
+    void OnRunScriptDateWithEmulationLevel(wxCommandEvent& evt);
+    void OnRunScriptArrayWithEmulationLevel(wxCommandEvent& evt);
+#endif
+    void OnRunScriptCustom(wxCommandEvent& evt);
     void OnClearSelection(wxCommandEvent& evt);
     void OnDeleteSelection(wxCommandEvent& evt);
     void OnSelectAll(wxCommandEvent& evt);
@@ -186,6 +206,22 @@ private:
     wxMenuItem* m_scroll_line_down;
     wxMenuItem* m_scroll_page_up;
     wxMenuItem* m_scroll_page_down;
+    wxMenuItem* m_script_string;
+    wxMenuItem* m_script_integer;
+    wxMenuItem* m_script_double;
+    wxMenuItem* m_script_bool;
+    wxMenuItem* m_script_object;
+    wxMenuItem* m_script_array;
+    wxMenuItem* m_script_dom;
+    wxMenuItem* m_script_undefined;
+    wxMenuItem* m_script_null;
+    wxMenuItem* m_script_date;
+#if wxUSE_WEBVIEW_IE
+    wxMenuItem* m_script_object_el;
+    wxMenuItem* m_script_date_el;
+    wxMenuItem* m_script_array_el;
+#endif
+    wxMenuItem* m_script_custom;
     wxMenuItem* m_selection_clear;
     wxMenuItem* m_selection_delete;
     wxMenuItem* m_find;
@@ -199,6 +235,9 @@ private:
     wxMenuHistoryMap m_histMenuItems;
     wxString m_findText;
     int m_findFlags, m_findCount;
+
+    // Last executed JavaScript snippet, for convenience.
+    wxString m_javascript;
 };
 
 class SourceViewDialog : public wxDialog
@@ -346,6 +385,7 @@ WebFrame::WebFrame(const wxString& url) :
     // Create the Tools menu
     m_tools_menu = new wxMenu();
     wxMenuItem* print = m_tools_menu->Append(wxID_ANY , _("Print"));
+    wxMenuItem* setPage = m_tools_menu->Append(wxID_ANY , _("Set page text"));
     wxMenuItem* viewSource = m_tools_menu->Append(wxID_ANY , _("View Source"));
     wxMenuItem* viewText = m_tools_menu->Append(wxID_ANY, _("View Text"));
     m_tools_menu->AppendSeparator();
@@ -393,7 +433,24 @@ WebFrame::WebFrame(const wxString& url) :
     m_scroll_page_down = scroll_menu->Append(wxID_ANY, "Page d&own");
     m_tools_menu->AppendSubMenu(scroll_menu, "Scroll");
 
-    wxMenuItem* script =  m_tools_menu->Append(wxID_ANY, _("Run Script"));
+    wxMenu* script_menu = new wxMenu;
+    m_script_string = script_menu->Append(wxID_ANY, "Return String");
+    m_script_integer = script_menu->Append(wxID_ANY, "Return integer");
+    m_script_double = script_menu->Append(wxID_ANY, "Return double");
+    m_script_bool = script_menu->Append(wxID_ANY, "Return bool");
+    m_script_object = script_menu->Append(wxID_ANY, "Return JSON object");
+    m_script_array = script_menu->Append(wxID_ANY, "Return array");
+    m_script_dom = script_menu->Append(wxID_ANY, "Modify DOM");
+    m_script_undefined = script_menu->Append(wxID_ANY, "Return undefined");
+    m_script_null = script_menu->Append(wxID_ANY, "Return null");
+    m_script_date = script_menu->Append(wxID_ANY, "Return Date");
+#if wxUSE_WEBVIEW_IE
+    m_script_object_el = script_menu->Append(wxID_ANY, "Return JSON object changing emulation level");
+    m_script_date_el = script_menu->Append(wxID_ANY, "Return Date changing emulation level");
+    m_script_array_el = script_menu->Append(wxID_ANY, "Return array changing emulation level");
+#endif
+    m_script_custom = script_menu->Append(wxID_ANY, "Custom script");
+    m_tools_menu->AppendSubMenu(script_menu, _("Run Script"));
 
     //Selection menu
     wxMenu* selection = new wxMenu();
@@ -460,6 +517,8 @@ WebFrame::WebFrame(const wxString& url) :
             wxWebViewEventHandler(WebFrame::OnTitleChanged), NULL, this);
 
     // Connect the menu events
+    Connect(setPage->GetId(), wxEVT_MENU,
+            wxCommandEventHandler(WebFrame::OnSetPage),  NULL, this );
     Connect(viewSource->GetId(), wxEVT_MENU,
             wxCommandEventHandler(WebFrame::OnViewSourceRequest),  NULL, this );
     Connect(viewText->GetId(), wxEVT_MENU,
@@ -502,8 +561,36 @@ WebFrame::WebFrame(const wxString& url) :
             wxCommandEventHandler(WebFrame::OnScrollPageUp),  NULL, this );
     Connect(m_scroll_page_down->GetId(), wxEVT_MENU,
             wxCommandEventHandler(WebFrame::OnScrollPageDown),  NULL, this );
-    Connect(script->GetId(), wxEVT_MENU,
-            wxCommandEventHandler(WebFrame::OnRunScript),  NULL, this );
+    Connect(m_script_string->GetId(), wxEVT_MENU,
+            wxCommandEventHandler(WebFrame::OnRunScriptString),  NULL, this );
+    Connect(m_script_integer->GetId(), wxEVT_MENU,
+            wxCommandEventHandler(WebFrame::OnRunScriptInteger),  NULL, this );
+    Connect(m_script_double->GetId(), wxEVT_MENU,
+            wxCommandEventHandler(WebFrame::OnRunScriptDouble),  NULL, this );
+    Connect(m_script_bool->GetId(), wxEVT_MENU,
+            wxCommandEventHandler(WebFrame::OnRunScriptBool),  NULL, this );
+    Connect(m_script_object->GetId(), wxEVT_MENU,
+            wxCommandEventHandler(WebFrame::OnRunScriptObject),  NULL, this );
+    Connect(m_script_array->GetId(), wxEVT_MENU,
+            wxCommandEventHandler(WebFrame::OnRunScriptArray),  NULL, this );
+    Connect(m_script_dom->GetId(), wxEVT_MENU,
+            wxCommandEventHandler(WebFrame::OnRunScriptDOM),  NULL, this );
+    Connect(m_script_undefined->GetId(), wxEVT_MENU,
+            wxCommandEventHandler(WebFrame::OnRunScriptUndefined),  NULL, this );
+    Connect(m_script_null->GetId(), wxEVT_MENU,
+            wxCommandEventHandler(WebFrame::OnRunScriptNull),  NULL, this );
+    Connect(m_script_date->GetId(), wxEVT_MENU,
+            wxCommandEventHandler(WebFrame::OnRunScriptDate),  NULL, this );
+#if wxUSE_WEBVIEW_IE
+    Connect(m_script_object_el->GetId(), wxEVT_MENU,
+            wxCommandEventHandler(WebFrame::OnRunScriptObjectWithEmulationLevel),  NULL, this );
+    Connect(m_script_date_el->GetId(), wxEVT_MENU,
+            wxCommandEventHandler(WebFrame::OnRunScriptDateWithEmulationLevel),  NULL, this );
+    Connect(m_script_array_el->GetId(), wxEVT_MENU,
+            wxCommandEventHandler(WebFrame::OnRunScriptArrayWithEmulationLevel),  NULL, this );
+#endif
+    Connect(m_script_custom->GetId(), wxEVT_MENU,
+            wxCommandEventHandler(WebFrame::OnRunScriptCustom),  NULL, this );
     Connect(m_selection_clear->GetId(), wxEVT_MENU,
             wxCommandEventHandler(WebFrame::OnClearSelection),  NULL, this );
     Connect(m_selection_delete->GetId(), wxEVT_MENU,
@@ -811,6 +898,16 @@ void WebFrame::OnTitleChanged(wxWebViewEvent& evt)
     wxLogMessage("%s", "Title changed; title='" + evt.GetString() + "'");
 }
 
+void WebFrame::OnSetPage(wxCommandEvent& WXUNUSED(evt))
+{
+    m_browser->SetPage
+               (
+                "<html><title>New Page</title>"
+                "<body>Created using <tt>SetPage()</tt> method.</body></html>",
+                wxString()
+               );
+}
+
 /**
   * Invoked when user selects the "View Source" menu item
   */
@@ -969,13 +1066,118 @@ void WebFrame::OnHistory(wxCommandEvent& evt)
     m_browser->LoadHistoryItem(m_histMenuItems[evt.GetId()]);
 }
 
-void WebFrame::OnRunScript(wxCommandEvent& WXUNUSED(evt))
+void WebFrame::RunScript(const wxString& javascript)
 {
-    wxTextEntryDialog dialog(this, "Enter JavaScript to run.", wxGetTextFromUserPromptStr, "", wxOK|wxCANCEL|wxCENTRE|wxTE_MULTILINE);
-    if(dialog.ShowModal() == wxID_OK)
+    // Remember the script we run in any case, so the next time the user opens
+    // the "Run Script" dialog box, it is shown there for convenient updating.
+    m_javascript = javascript;
+
+    wxLogMessage("Running JavaScript:\n%s\n", javascript);
+
+    wxString result;
+    if ( m_browser->RunScript(javascript, &result) )
     {
-        m_browser->RunScript(dialog.GetValue());
+        wxLogMessage("RunScript() returned \"%s\"", result);
     }
+    else
+    {
+        wxLogWarning("RunScript() failed");
+    }
+}
+
+void WebFrame::OnRunScriptString(wxCommandEvent& WXUNUSED(evt))
+{
+    RunScript("function f(a){return a;}f('Hello World!');");
+}
+
+void WebFrame::OnRunScriptInteger(wxCommandEvent& WXUNUSED(evt))
+{
+    RunScript("function f(a){return a;}f(123);");
+}
+
+void WebFrame::OnRunScriptDouble(wxCommandEvent& WXUNUSED(evt))
+{
+    RunScript("function f(a){return a;}f(2.34);");
+}
+
+void WebFrame::OnRunScriptBool(wxCommandEvent& WXUNUSED(evt))
+{
+    RunScript("function f(a){return a;}f(false);");
+}
+
+void WebFrame::OnRunScriptObject(wxCommandEvent& WXUNUSED(evt))
+{
+    RunScript("function f(){var person = new Object();person.name = 'Foo'; \
+        person.lastName = 'Bar';return person;}f();");
+}
+
+void WebFrame::OnRunScriptArray(wxCommandEvent& WXUNUSED(evt))
+{
+    RunScript("function f(){ return [\"foo\", \"bar\"]; }f();");
+}
+
+void WebFrame::OnRunScriptDOM(wxCommandEvent& WXUNUSED(evt))
+{
+    RunScript("document.write(\"Hello World!\");");
+}
+
+void WebFrame::OnRunScriptUndefined(wxCommandEvent& WXUNUSED(evt))
+{
+    RunScript("function f(){var person = new Object();}f();");
+}
+
+void WebFrame::OnRunScriptNull(wxCommandEvent& WXUNUSED(evt))
+{
+    RunScript("function f(){return null;}f();");
+}
+
+void WebFrame::OnRunScriptDate(wxCommandEvent& WXUNUSED(evt))
+{
+    RunScript("function f(){var d = new Date('10/08/2017 21:30:40'); \
+        var tzoffset = d.getTimezoneOffset() * 60000; \
+        return new Date(d.getTime() - tzoffset);}f();");
+}
+
+#if wxUSE_WEBVIEW_IE
+void WebFrame::OnRunScriptObjectWithEmulationLevel(wxCommandEvent& WXUNUSED(evt))
+{
+    wxWebViewIE::MSWSetModernEmulationLevel();
+    RunScript("function f(){var person = new Object();person.name = 'Foo'; \
+        person.lastName = 'Bar';return person;}f();");
+    wxWebViewIE::MSWSetModernEmulationLevel(false);
+}
+
+void WebFrame::OnRunScriptDateWithEmulationLevel(wxCommandEvent& WXUNUSED(evt))
+{
+    wxWebViewIE::MSWSetModernEmulationLevel();
+    RunScript("function f(){var d = new Date('10/08/2017 21:30:40'); \
+        var tzoffset = d.getTimezoneOffset() * 60000; return \
+        new Date(d.getTime() - tzoffset);}f();");
+    wxWebViewIE::MSWSetModernEmulationLevel(false);
+}
+
+void WebFrame::OnRunScriptArrayWithEmulationLevel(wxCommandEvent& WXUNUSED(evt))
+{
+    wxWebViewIE::MSWSetModernEmulationLevel();
+    RunScript("function f(){ return [\"foo\", \"bar\"]; }f();");
+    wxWebViewIE::MSWSetModernEmulationLevel(false);
+}
+#endif
+
+void WebFrame::OnRunScriptCustom(wxCommandEvent& WXUNUSED(evt))
+{
+    wxTextEntryDialog dialog
+                      (
+                        this,
+                        "Please enter JavaScript code to execute",
+                        wxGetTextFromUserPromptStr,
+                        m_javascript,
+                        wxOK | wxCANCEL | wxCENTRE | wxTE_MULTILINE
+                      );
+    if( dialog.ShowModal() != wxID_OK )
+        return;
+
+    RunScript(dialog.GetValue());
 }
 
 void WebFrame::OnClearSelection(wxCommandEvent& WXUNUSED(evt))
diff --git a/src/gtk/webview_webkit.cpp b/src/gtk/webview_webkit.cpp
index bc45beb1bc..ea0eb0d967 100644
--- a/src/gtk/webview_webkit.cpp
+++ b/src/gtk/webview_webkit.cpp
@@ -949,10 +949,21 @@ wxString wxWebViewWebKit::GetPageText() const
                     wxConvUTF8);
 }
 
-void wxWebViewWebKit::RunScript(const wxString& javascript)
+bool wxWebViewWebKit::RunScript(const wxString& javascript, wxString* output)
 {
+    wxCHECK_MSG( m_web_view, false,
+        wxS("wxWebView must be created before calling RunScript()") );
+
+    if ( output != NULL )
+    {
+        wxLogWarning(_("Retrieving JavaScript script output is not supported with WebKit v1"));
+        return false;
+    }
+
     webkit_web_view_execute_script(m_web_view,
                                    javascript.mb_str(wxConvUTF8));
+
+    return true;
 }
 
 void wxWebViewWebKit::RegisterHandler(wxSharedPtr<wxWebViewHandler> handler)
diff --git a/src/gtk/webview_webkit2.cpp b/src/gtk/webview_webkit2.cpp
index 16f82336b0..c6ae1914da 100644
--- a/src/gtk/webview_webkit2.cpp
+++ b/src/gtk/webview_webkit2.cpp
@@ -19,7 +19,13 @@
 #include "wx/base64.h"
 #include "wx/log.h"
 #include "wx/gtk/private/webview_webkit2_extension.h"
+#include "wx/gtk/private/string.h"
+#include "wx/gtk/private/webkit.h"
+#include "wx/gtk/private/error.h"
+#include "wx/private/jsscriptwrapper.h"
 #include <webkit2/webkit2.h>
+#include <JavaScriptCore/JSValueRef.h>
+#include <JavaScriptCore/JSStringRef.h>
 
 // ----------------------------------------------------------------------------
 // GTK callbacks
@@ -1098,13 +1104,112 @@ wxString wxWebViewWebKit::GetPageText() const
     return wxString();
 }
 
-void wxWebViewWebKit::RunScript(const wxString& javascript)
+extern "C"
 {
+
+static void wxgtk_run_javascript_cb(GObject *,
+                                    GAsyncResult *res,
+                                    void *user_data)
+{
+    g_object_ref(res);
+
+    GAsyncResult** res_out = static_cast<GAsyncResult**>(user_data);
+    *res_out = res;
+}
+
+} // extern "C"
+
+// Run the given script synchronously and return its result in output.
+bool wxWebViewWebKit::RunScriptSync(const wxString& javascript, wxString* output)
+{
+    GAsyncResult *result = NULL;
     webkit_web_view_run_javascript(m_web_view,
-                                   javascript.mb_str(wxConvUTF8),
+                                   javascript.utf8_str(),
                                    NULL,
-                                   NULL,
-                                   NULL);
+                                   wxgtk_run_javascript_cb,
+                                   &result);
+
+    GMainContext *main_context = g_main_context_get_thread_default();
+
+    while ( !result )
+        g_main_context_iteration(main_context, TRUE);
+
+    wxGtkError error;
+    wxWebKitJavascriptResult js_result
+                             (
+                                webkit_web_view_run_javascript_finish
+                                (
+                                    m_web_view,
+                                    result,
+                                    error.Out()
+                                )
+                             );
+
+    // Match g_object_ref() in wxgtk_run_javascript_cb()
+    g_object_unref(result);
+
+    if ( !js_result )
+    {
+        if ( output )
+            *output = error.GetMessage();
+        return false;
+    }
+
+    JSGlobalContextRef context = webkit_javascript_result_get_global_context(js_result);
+    JSValueRef value = webkit_javascript_result_get_value(js_result);
+
+    JSValueRef exception = NULL;
+    wxJSStringRef js_value
+                  (
+                   JSValueIsObject(context, value)
+                       ? JSValueCreateJSONString(context, value, 0, &exception)
+                       : JSValueToStringCopy(context, value, &exception)
+                  );
+
+    if ( exception )
+    {
+        if ( output )
+        {
+            wxJSStringRef ex_value(JSValueToStringCopy(context, exception, NULL));
+            *output = ex_value.ToWxString();
+        }
+
+        return false;
+    }
+
+    if ( output != NULL )
+        *output = js_value.ToWxString();
+
+    return true;
+}
+
+bool wxWebViewWebKit::RunScript(const wxString& javascript, wxString* output)
+{
+    wxJSScriptWrapper wrapJS(javascript, &m_runScriptCount);
+
+    // This string is also used as an error indicator: it's cleared if there is
+    // no error or used in the warning message below if there is one.
+    wxString result;
+    if ( RunScriptSync(wrapJS.GetWrappedCode(), &result)
+            && result == wxS("true") )
+    {
+        if ( RunScriptSync(wrapJS.GetOutputCode(), &result) )
+        {
+            if ( output )
+                *output = result;
+            result.clear();
+        }
+
+        RunScriptSync(wrapJS.GetCleanUpCode());
+    }
+
+    if ( !result.empty() )
+    {
+        wxLogWarning(_("Error running JavaScript: %s"), result);
+        return false;
+    }
+
+    return true;
 }
 
 void wxWebViewWebKit::RegisterHandler(wxSharedPtr<wxWebViewHandler> handler)
diff --git a/src/msw/webview_ie.cpp b/src/msw/webview_ie.cpp
index 386e080765..46c26c3d21 100644
--- a/src/msw/webview_ie.cpp
+++ b/src/msw/webview_ie.cpp
@@ -29,6 +29,8 @@
 #include "wx/dynlib.h"
 #include "wx/scopeguard.h"
 
+#include "wx/private/jsscriptwrapper.h"
+
 #include <initguid.h>
 #include <wininet.h>
 
@@ -853,25 +855,103 @@ wxString wxWebViewIE::GetPageText() const
     }
 }
 
-void wxWebViewIE::RunScript(const wxString& javascript)
+bool wxWebViewIE::MSWSetModernEmulationLevel(bool modernLevel)
 {
-    wxCOMPtr<IHTMLDocument2> document(GetDocument());
+    // Registry key where emulation level for programs are set
+    static const wxChar* IE_EMULATION_KEY =
+        wxT("SOFTWARE\\Microsoft\\Internet Explorer\\Main")
+        wxT("\\FeatureControl\\FEATURE_BROWSER_EMULATION");
 
-    if(document)
+    wxRegKey key(wxRegKey::HKCU, IE_EMULATION_KEY);
+    if ( !key.Exists() )
     {
-        wxCOMPtr<IHTMLWindow2> window;
-        wxString language = "javascript";
-        HRESULT hr = document->get_parentWindow(&window);
-        if(SUCCEEDED(hr))
+        wxLogWarning(_("Failed to find web view emulation level in the registry"));
+        return false;
+    }
+
+    const wxString programName = wxGetFullModuleName().AfterLast('\\');
+    if ( modernLevel )
+    {
+        // IE8 (8000) is sufficiently modern for our needs, see
+        // https://msdn.microsoft.com/library/ee330730.aspx#browser_emulation
+        // for other values that could be used here.
+        if ( !key.SetValue(programName, 8000) )
         {
-            VARIANT level;
-            VariantInit(&level);
-            V_VT(&level) = VT_EMPTY;
-            window->execScript(wxBasicString(javascript),
-                               wxBasicString(language),
-                               &level);
+            wxLogWarning(_("Failed to set web view to modern emulation level"));
+            return false;
         }
     }
+    else
+    {
+        if ( !key.DeleteValue(programName) )
+        {
+            wxLogWarning(_("Failed to reset web view to standard emulation level"));
+            return false;
+        }
+    }
+
+    return true;
+}
+
+static
+bool CallEval(const wxString& code,
+              wxAutomationObject& scriptAO,
+              wxVariant* varResult)
+{
+    wxVariant varCode(code);
+    return scriptAO.Invoke("eval", DISPATCH_METHOD, *varResult, 1, &varCode);
+}
+
+bool wxWebViewIE::RunScript(const wxString& javascript, wxString* output)
+{
+    wxCOMPtr<IHTMLDocument2> document(GetDocument());
+    if ( !document )
+    {
+        wxLogWarning(_("Can't run JavaScript script without a valid HTML document"));
+        return false;
+    }
+
+    IDispatch* scriptDispatch = NULL;
+    if ( FAILED(document->get_Script(&scriptDispatch)) )
+    {
+        wxLogWarning(_("Can't get the JavaScript object"));
+        return false;
+    }
+
+    wxJSScriptWrapper wrapJS(javascript, &m_runScriptCount);
+
+    wxAutomationObject scriptAO(scriptDispatch);
+    wxVariant varResult;
+
+    wxString err;
+    if ( !CallEval(wrapJS.GetWrappedCode(), scriptAO, &varResult) )
+    {
+        err = _("failed to evaluate");
+    }
+    else if ( varResult.IsType("bool") && varResult.GetBool() )
+    {
+        if ( output != NULL )
+        {
+            if ( CallEval(wrapJS.GetOutputCode(), scriptAO, &varResult) )
+                *output = varResult.MakeString();
+            else
+                err = _("failed to retrieve execution result");
+        }
+
+        CallEval(wrapJS.GetCleanUpCode(), scriptAO, &varResult);
+    }
+    else // result available but not the expected "true"
+    {
+        err = varResult.MakeString();
+    }
+
+    if ( !err.empty() )
+    {
+        wxLogWarning(_("Error running JavaScript: %s"), varResult.MakeString());
+        return false;
+    }
+
+    return true;
 }
 
 void wxWebViewIE::RegisterHandler(wxSharedPtr<wxWebViewHandler> handler)
diff --git a/src/osx/webview_webkit.mm b/src/osx/webview_webkit.mm
index 134b64d999..13b76e0626 100644
--- a/src/osx/webview_webkit.mm
+++ b/src/osx/webview_webkit.mm
@@ -24,6 +24,7 @@
 
 #include "wx/osx/private.h"
 #include "wx/osx/core/cfref.h"
+#include "wx/private/jsscriptwrapper.h"
 
 #include "wx/hashmap.h"
 #include "wx/filesys.h"
@@ -408,13 +409,51 @@ wxString wxWebViewWebKit::GetSelectedText() const
     return wxCFStringRef::AsString([dr toString]);
 }
 
-void wxWebViewWebKit::RunScript(const wxString& javascript)
+bool wxWebViewWebKit::RunScript(const wxString& javascript, wxString* output)
 {
-    if ( !m_webView )
-        return;
+    wxCHECK_MSG( m_webView, false,
+        wxS("wxWebView must be created before calling RunScript()") );
 
-    [[m_webView windowScriptObject] evaluateWebScript:
-                    wxCFStringRef( javascript ).AsNSString()];
+    wxJSScriptWrapper wrapJS(javascript, &m_runScriptCount);
+
+    NSString* result = [m_webView stringByEvaluatingJavaScriptFromString:
+                            wxCFStringRef( wrapJS.GetWrappedCode() ).AsNSString()];
+
+    wxString err;
+    if ( result == nil )
+    {
+        // This is not very informative, but we just don't have any other
+        // information in this case.
+        err = _("failed to evaluate");
+    }
+    else if ( [result isEqualToString:@"true"] )
+    {
+        result = [m_webView stringByEvaluatingJavaScriptFromString:
+                    wxCFStringRef( wrapJS.GetOutputCode() ).AsNSString()];
+
+        [m_webView stringByEvaluatingJavaScriptFromString:
+            wxCFStringRef( wrapJS.GetCleanUpCode() ).AsNSString()];
+
+        if ( output != NULL )
+        {
+            if ( result )
+                *output = wxCFStringRef::AsString(result);
+            else
+                err = _("failed to retrieve execution result");
+        }
+    }
+    else // result available but not the expected "true"
+    {
+        err = wxCFStringRef::AsString(result);
+    }
+
+    if ( !err.empty() )
+    {
+        wxLogWarning(_("Error running JavaScript: %s"), err);
+        return false;
+    }
+
+    return true;
 }
 
 void wxWebViewWebKit::OnSize(wxSizeEvent &event)
diff --git a/tests/controls/webtest.cpp b/tests/controls/webtest.cpp
index 83a8f31c87..b6742e663b 100644
--- a/tests/controls/webtest.cpp
+++ b/tests/controls/webtest.cpp
@@ -8,7 +8,7 @@
 
 #include "testprec.h"
 
-#if wxUSE_WEBVIEW && (wxUSE_WEBVIEW_WEBKIT || wxUSE_WEBVIEW_IE)
+#if wxUSE_WEBVIEW && (wxUSE_WEBVIEW_WEBKIT || wxUSE_WEBVIEW_WEBKIT2 || wxUSE_WEBVIEW_IE)
 
 #ifdef __BORLANDC__
     #pragma hdrstop
@@ -22,6 +22,9 @@
 #include "wx/uiaction.h"
 #include "wx/webview.h"
 #include "asserthelper.h"
+#if wxUSE_WEBVIEW_IE
+    #include "wx/msw/webview_ie.h"
+#endif
 
 class WebTestCase : public CppUnit::TestCase
 {
@@ -36,8 +39,11 @@ private:
         CPPUNIT_TEST( Title );
         CPPUNIT_TEST( Url );
         CPPUNIT_TEST( History );
+#if !wxUSE_WEBVIEW_WEBKIT2
+        //This is not implemented on WEBKIT2. See implementation.
         CPPUNIT_TEST( HistoryEnable );
         CPPUNIT_TEST( HistoryClear );
+#endif
         CPPUNIT_TEST( HistoryList );
         CPPUNIT_TEST( Editable );
         CPPUNIT_TEST( Selection );
@@ -66,7 +72,7 @@ private:
 };
 
 //Convenience macro
-#define ENSURE_LOADED WX_ASSERT_EVENT_OCCURS((*m_loaded), 1)
+#define ENSURE_LOADED WX_ASSERT_EVENT_OCCURS_IN((*m_loaded), 1, 1000)
 
 // register in the unnamed registry so that these tests are run by default
 CPPUNIT_TEST_SUITE_REGISTRATION( WebTestCase );
@@ -76,10 +82,10 @@ CPPUNIT_TEST_SUITE_NAMED_REGISTRATION( WebTestCase, "WebTestCase" );
 
 void WebTestCase::setUp()
 {
-    m_browser = wxWebView::New(wxTheApp->GetTopWindow(), wxID_ANY);
-
+    m_browser = wxWebView::New();
     m_loaded = new EventCounter(m_browser, wxEVT_WEBVIEW_LOADED);
-    m_browser->LoadURL("about:blank");
+
+    m_browser -> Create(wxTheApp->GetTopWindow(), wxID_ANY);
     ENSURE_LOADED;
 }
 
@@ -262,8 +268,109 @@ void WebTestCase::Zoom()
 
 void WebTestCase::RunScript()
 {
-    m_browser->RunScript("document.write(\"Hello World!\");");
+    m_browser->
+        SetPage("<html><head><script></script></head><body></body></html>", "");
+    ENSURE_LOADED;
+
+    wxString result;
+#if wxUSE_WEBVIEW_IE
+    CPPUNIT_ASSERT(wxWebViewIE::MSWSetModernEmulationLevel());
+
+    // Define a specialized scope guard ensuring that we reset the emulation
+    // level to its default value even if any asserts below fail.
+    class ResetEmulationLevel
+    {
+    public:
+        ResetEmulationLevel()
+        {
+            m_reset = true;
+        }
+
+        bool DoReset()
+        {
+            m_reset = false;
+            return wxWebViewIE::MSWSetModernEmulationLevel(false);
+        }
+
+        ~ResetEmulationLevel()
+        {
+            if ( m_reset )
+                DoReset();
+        }
+
+    private:
+        bool m_reset;
+    } resetEmulationLevel;
+
+    CPPUNIT_ASSERT(m_browser->RunScript("function f(){var person = new Object();person.name = 'Bar'; \
+        person.lastName = 'Foo';return person;}f();", &result));
+    CPPUNIT_ASSERT_EQUAL("{\"name\":\"Bar\",\"lastName\":\"Foo\"}", result);
+
+    CPPUNIT_ASSERT(m_browser->RunScript("function f(){ return [\"foo\", \"bar\"]; }f();", &result));
+    CPPUNIT_ASSERT_EQUAL("[\"foo\",\"bar\"]", result);
+
+    CPPUNIT_ASSERT(m_browser->RunScript("function f(){var d = new Date('10/08/2017 21:30:40'); \
+        var tzoffset = d.getTimezoneOffset() * 60000; return new Date(d.getTime() - tzoffset);}f();",
+        &result));
+    CPPUNIT_ASSERT_EQUAL("\"2017-10-08T21:30:40.000Z\"", result);
+
+    CPPUNIT_ASSERT(resetEmulationLevel.DoReset());
+#endif // wxUSE_WEBVIEW_IE
+
+    CPPUNIT_ASSERT(m_browser->RunScript("document.write(\"Hello World!\");"));
     CPPUNIT_ASSERT_EQUAL("Hello World!", m_browser->GetPageText());
+
+    CPPUNIT_ASSERT(m_browser->RunScript("function f(a){return a;}f('Hello World!');", &result));
+    CPPUNIT_ASSERT_EQUAL(_("Hello World!"), result);
+
+    CPPUNIT_ASSERT(m_browser->RunScript("function f(a){return a;}f(123);", &result));
+    CPPUNIT_ASSERT_EQUAL(123, wxAtoi(result));
+
+    CPPUNIT_ASSERT(m_browser->
+        RunScript("function f(a){return a;}f(2.34);", &result));
+    double value;
+    result.ToDouble(&value);
+    CPPUNIT_ASSERT_EQUAL(2.34, value);
+
+    CPPUNIT_ASSERT(m_browser->RunScript("function f(a){return a;}f(false);", &result));
+    CPPUNIT_ASSERT_EQUAL("false", result);
+
+    CPPUNIT_ASSERT(m_browser->RunScript("function f(){var person = new Object();person.name = 'Foo'; \
+        person.lastName = 'Bar';return person;}f();", &result));
+    CPPUNIT_ASSERT_EQUAL("{\"name\":\"Foo\",\"lastName\":\"Bar\"}", result);
+
+    CPPUNIT_ASSERT(m_browser->RunScript("function f(){ return [\"foo\", \"bar\"]; }f();", &result));
+    CPPUNIT_ASSERT_EQUAL("[\"foo\",\"bar\"]", result);
+
+    CPPUNIT_ASSERT(m_browser->RunScript("function f(){var person = new Object();}f();", &result));
+    CPPUNIT_ASSERT_EQUAL("undefined", result);
+
+    CPPUNIT_ASSERT(m_browser->RunScript("function f(){return null;}f();", &result));
+    CPPUNIT_ASSERT_EQUAL("null", result);
+
+    result = "";
+    CPPUNIT_ASSERT(!m_browser->RunScript("int main() { return 0; }", &result));
+    CPPUNIT_ASSERT(!result);
+
+    CPPUNIT_ASSERT(m_browser->RunScript("function a() { return eval(\"function b() { \
+        return eval(\\\"function c() { return eval(\\\\\\\"function d() { \
+        return \\\\\\\\\\\\\\\"test\\\\\\\\\\\\\\\"; } d();\\\\\\\"); } \
+        c();\\\"); } b();\"); } a();", &result));
+    CPPUNIT_ASSERT_EQUAL("test", result);
+
+    CPPUNIT_ASSERT(m_browser->RunScript("function f(a){return a;}f(\"This is a backslash: \\\\\");",
+        &result));
+    CPPUNIT_ASSERT_EQUAL("This is a backslash: \\", result);
+
+    CPPUNIT_ASSERT(m_browser->RunScript("function f(){var d = new Date('10/08/2016 21:30:40'); \
+        var tzoffset = d.getTimezoneOffset() * 60000; return new Date(d.getTime() - tzoffset);}f();",
+        &result));
+    CPPUNIT_ASSERT_EQUAL("\"2016-10-08T21:30:40.000Z\"", result);
+
+    // Check for errors too.
+    CPPUNIT_ASSERT(!m_browser->RunScript("syntax(error"));
+    CPPUNIT_ASSERT(!m_browser->RunScript("syntax(error", &result));
+    CPPUNIT_ASSERT(!m_browser->RunScript("x.y.z"));
 }
 
 void WebTestCase::SetPage()
@@ -277,4 +384,4 @@ void WebTestCase::SetPage()
     CPPUNIT_ASSERT_EQUAL("other text", m_browser->GetPageText());
 }
 
-#endif //wxUSE_WEBVIEW && (wxUSE_WEBVIEW_WEBKIT || wxUSE_WEBVIEW_IE)
+#endif //wxUSE_WEBVIEW && (wxUSE_WEBVIEW_WEBKIT || wxUSE_WEBVIEW_WEBKIT2 || wxUSE_WEBVIEW_IE)
diff --git a/tests/testprec.h b/tests/testprec.h
index 71e489e1e0..8bbaf4be70 100644
--- a/tests/testprec.h
+++ b/tests/testprec.h
@@ -100,13 +100,13 @@ public:
     #define WX_ASSERT_FAILS_WITH_ASSERT(cond)
 #endif
 
-#define WX_ASSERT_EVENT_OCCURS(eventcounter, count) \
+#define WX_ASSERT_EVENT_OCCURS_IN(eventcounter, count, ms) \
 {\
     wxStopWatch sw; \
     wxEventLoopBase* loop = wxEventLoopBase::GetActive(); \
     while(eventcounter.GetCount() < count) \
     { \
-        if(sw.Time() < 100) \
+        if(sw.Time() < ms) \
             loop->Dispatch(); \
         else \
         { \
@@ -119,6 +119,8 @@ public:
     eventcounter.Clear(); \
 }
 
+#define WX_ASSERT_EVENT_OCCURS(eventcounter,count) WX_ASSERT_EVENT_OCCURS_IN(eventcounter, count, 100)
+
 // these functions can be used to hook into wxApp event processing and are
 // currently used by the events propagation test
 class WXDLLIMPEXP_FWD_BASE wxEvent;