One-stop patch for Emacs NS-port xwidget (by @veshboo)

0_all_webkit.patch

From 2063aad860376419d899d1ae06ccb7daf56ef9ef Mon Sep 17 00:00:00 2001
From: Jaesup Kwak <veshboo@gmail.com>
Date: Mon, 4 Dec 2017 21:23:19 +0900
Subject: [PATCH] Support xwidget webkit for macOS X

Add xwidget webkit support for macOS X / NS Cocoa and accompanying
changes.

Squash changes for comments from Alan Third in Bug#29565.

* configure.ac: Allow '--with-xwidgets' for "${NS_IMPL_COCOA}".
* lisp/xwidget.el
(xwidget-webkit-cx2-cb, xwidget-webkit-cx3-cb, xwidget-webkit-cx2)
(xwidget-webkit-cx3, xwidget-webkit-mode-map): New webkit session when
window split and key map for 'nextstep'.
(xwidget-log): Fix typo in buffer name.
(xwidget-event-handler): Remove a 'message'.
(xwidget-webkit-callback, xwidget-webkit-url-title-cb): Replace lambda
with defun for GC safe, remember URL for bookmark integration, and
support vector result from javascript.
(xwidget-webkit-mode): No cursor and integration for 'isearch'.
(xwidget-webkit-bookmark-jump-new-session): Add new variable.
(xwidget-webkit-bookmark-make-record): Changes to save URL in
'filename' attribute of a bookmark record, the URL obtained when the
page was loaded, and 'switch-to-buffer' when a bookmark selected.
(xwidget-webkit-isearch-last-length, xwidget-webkit-search-js)
(xwidget-webkit-search-fun-function): Integration for 'isearch'.
(xwidget-webkit-insert-string, xwidget-webkit-insert-string-cb): GC
safe, FIELD is now a list, and fix for a javascript exception.
(xwidget-window-inside-pixel-width)
(xwidget-window-inside-pixel-height)
(xwidget-webkit-adjust-size-to-window)
(xwidget-webkit-new-session): New functions to get window inside width
and height in pixel and insert invisible URL instead of ' '.
(xwidget-webkit-current-url, xwidget-webkit-current-url-cb): GC safe.
(xwidget-webkit-copy-selection-as-kill): GC safe.
* nextstep/templates/Info.plist.in: Add 'NSAppTransportSecurity'.
* src/Makefile.in: Add nsxwidget.o for compilation.
* src/emacs.c (main): Simplify conditional call to 'syms_of_xwidget'.
* src/nsterm.m (ns_draw_glyph_string): Add case for 'XWIDGET_GLYPH'.
(note_mouse_movement mouseMoved): Make it easy to resize window by
dragging mode-line or vertical separator adjacent to large glyph.
* src/nsxwidget.h src/nsxwidget.m: Newly added files, xwidget webkit
backend for macOS Cocoa.
* src/xwidget.c src/xwidget.h (xwidget xwidget_view): Add macOS Cocoa
specific fields with 'NS_IMPL_COCOA', guard GTK specific fields with
'USE_GTK' in the structures, and implement accordingly.
(x_draw_xwidget_glyph_string): Change for top alignment of xwidgets in
a glyph string instead of vertically middle alignment.

Fix typo (Bug#29565)

* configure.ac

Stop audio when xwidget-webkit killed (Bug#29565)

* src/nsxwidget.m

Functions when javascript not allowed (Bug#29565)

Support some basic xwidget webkit functions when javascript blocked by
'Content-Security-Policy'.  Replace some javascript calls with webkit
native functions and remove callbacks for the javascripts.

Refactor 'xwidget-webkit-current-url', no side effect of message or
kill-ring.  No more async, directly used in bookmarking, removing URL
text property.  Add new function 'xwidget-webkit-url-message-kill' for
old behavior.

Add new key map 'f' to new function 'xwidget-webkit-forward'.

Uniquely 'rename-buffer' with page title when the page is loaded.

Enable web inspector for ns xwidget webkit.

Change xwScript (ns xwidget webkit keyboard focus related script)
injection time to document start from document end.

* lisp/xwidget.el (xwidget-webkit-uri, xwidget-webkit-title)
(xwidget-webkit-goto-history): New webkit native functions.
(xwidget-webkit-cx2-cb, xwidget-webkit-cx3-cb)
(xwidget-webkit-url-title-cb, xwidget-webkit-current-url-cb): Remove
javascript callbacks.
(xwidget-webkit-callback): Replace javascript with webkit native.  No
URL text property.  Rename buffer unique.
(xwidget-webkit-back, xwidget-webkit-reload): Replace javascript with
webkit native.
(xwidget-webkit-mode-map, xwidget-webkit-forward): New function.
(xwidget-webkit-current-url, xwidget-webkit-current-url-message-kill)
(xwidget-webkit-cx2, xwidget-webkit-cx3)
(xwidget-webkit-bookmark-make-record): Replace javascript with webkit
native.  Refactor 'xwidget-webkit-current-url'.
* src/nsxwidget.h
* src/nsxwidget.m (nsxwidget_webkit_uri, nsxwidget_webkit_title)
(nsxwidget_webkit_goto_history): New webkit native functions.
(XwWebView::urlScriptBlocked, XwWebView::initWithFrame)
(XwWebView::decidePolicyForNavigationResponse, nsxwidget_kill): Add
property mapping URL to whether javascript allowed or not.  Enable web
inspector.  Change user script injection time.
(XwWebView::keyDown): Send keyDown event to emacs when javascript not
allowed or javascript execution error.
(nsxwidget_webkit_execute_script): Do not evaluate javascript when not
allowed.
* src/xwidget.c (Fxwidget_webkit_uri, Fxwiget_webkit_title)
(Fxwidget_webkit_goto_history, syms_of_xwidget): DEFUNs for new webkit
native functions and implementations for USE_GTK and NS_IMPLE_COCOA.

Fix event for dead xwidget buffer (Bug#29565)

Fix the bug introduced in 'Stop audio when xwidget-webkit killed'.

* src/nsxwidget.m (XwWebView::didFinishNavigation)

Enhance xwidget webkit scroll (Bug#29565)

Add key map 'S-SPC' for scroll down page.
Correct remappings for scroll by page and by line.
Add 'xwidget-webkit-scroll-line-height' variable.
Fix scroll to bottom function.

* lisp/xwidget.el
(xwidget-webkit-mode-map): Well suited scroll key mappings.
(xwidget-webkit-scroll-up, xwidget-webkit-scroll-down): Add optional
argument, scroll by a screen page by default.
(xwidget-webkit-scroll-line-height): Add variable.
(xwidget-webkit-scroll-up-line, xwidget-webkit-scroll-down-line): New
functions to scroll by lines.
(xwidget-webkit-scroll-bottom): Fix to scroll to bottom of the
document.

Remove a debug message

* lisp/xwidget.el (xwidget-webkit-scroll-up)

Page up/down by emacs window height (Bug#29565)

'xwidget-window-inside-pixel-height' is more reliable than javascript
'window.document.body.clientHeight' for scroll up/down by page.

* lisp/xwidget.el (xwidget-webkit-scroll-up)
(xwidget-webkit-scroll-down)

Fix compile failure for GTK xwidget (Bug#29565)

Fix incorrect GTK webkit function names, those were introduced with
"8d7750f464 Functions when javascript not allowed (Bug#29565)".

* src/xwidget.c (Fxwidget_webkit_goto_history)

Enable plugins for ns xwidget webkit (Bug#29565)

Enable plugins for ns xwidget webkit if
'xwidget-webkit-enable-plugins' is non-nil.

* lisp/xwidget.el (xwidget-webkit-enable-plugins)
* src/nsxwidget.m (XwWebView::initWithFrame)

Support file download and upload (Bug#29565)

For the MIME types, which ns xwidget webkit cannot show in a view,
'xwidget-webkit-save-as-file' is called via 'response-callback' event.

Ns xwidget webkit presents file open panel to select upload files.

Tighter check for javascript availability.

* lisp/xwidget.el
(xwidget-webkit-callback): Add case for 'response-callback' event.
(xwidget-webkit-download-dir): New variable.
(xwidget-webkit-save-as-file): New function.
* src/nsxwidget.m
(XwWebView::decidePolicyForNavigationResponse): Store the event.  And
tighter check for javascript availability.
(XwWebView::runOpenPanelWithParameters): Select upload files.
* src/xwidget.c
(store_xwidget_response_callback_event): New function.

Fix: xwidget
---
 configure.ac                     |  35 +-
 lisp/xwidget.el                  | 315 ++++++++++++----
 nextstep/templates/Info.plist.in |   8 +
 src/Makefile.in                  |   1 +
 src/emacs.c                      |   5 +-
 src/nsterm.m                     |  22 +-
 src/nsxwidget.h                  |  80 ++++
 src/nsxwidget.m                  | 625 +++++++++++++++++++++++++++++++
 src/xwidget.c                    | 249 +++++++++++-
 src/xwidget.h                    |  35 +-
 10 files changed, 1279 insertions(+), 96 deletions(-)
 create mode 100644 src/nsxwidget.h
 create mode 100644 src/nsxwidget.m

diff --git a/configure.ac b/configure.ac
index eddeb5073c..47652ccd41 100644
--- a/configure.ac
+++ b/configure.ac
@@ -405,7 +405,7 @@ AC_DEFUN
  [with_file_notification=$with_features])
 
 OPTION_DEFAULT_OFF([xwidgets],
-  [enable use of some gtk widgets in Emacs buffers (requires gtk3)])
+  [enable use of some gtk widgets in Emacs buffers (requires gtk3 or macOS Cocoa)])
 
 ## For the times when you want to build Emacs but don't have
 ## a suitable makeinfo, and can live without the manuals.
@@ -2741,20 +2741,34 @@ AC_DEFUN
 
 
 dnl Enable xwidgets if GTK3 and WebKitGTK+ are available.
+dnl Enable xwidgets if macOS Cocoa and WebKit framework are available.
 HAVE_XWIDGETS=no
 XWIDGETS_OBJ=
 if test "$with_xwidgets" != "no"; then
-  test "$USE_GTK_TOOLKIT" = "GTK3" && test "$window_system" != "none" ||
-    AC_MSG_ERROR([xwidgets requested but gtk3 not used.])
+  if test "$USE_GTK_TOOLKIT" = "GTK3" && test "$window_system" != "none"; then
+    WEBKIT_REQUIRED=2.12
+    WEBKIT_MODULES="webkit2gtk-4.0 >= $WEBKIT_REQUIRED"
+    EMACS_CHECK_MODULES([WEBKIT], [$WEBKIT_MODULES])
+    HAVE_XWIDGETS=$HAVE_WEBKIT
+    XWIDGETS_OBJ="xwidget.o"
+  elif test "${NS_IMPL_COCOA}" = "yes"; then
+    dnl FIXME: Check framework WebKit2
+    dnl WEBKIT_REQUIRED=M.m.p
+    WEBKIT_LIBS="-Wl,-framework -Wl,WebKit"
+    WEBKIT_CFLAGS="-D_REENTRANT -I/System/Library/Frameworks/WebKit.framework/Headers"
+    HAVE_WEBKIT="yes"
+    HAVE_XWIDGETS=$HAVE_WEBKIT
+    XWIDGETS_OBJ="xwidget.o"
+    NS_OBJC_OBJ="$NS_OBJC_OBJ nsxwidget.o"
+    dnl Update NS_OBJC_OBJ with added nsxwidget.o
+    AC_SUBST(NS_OBJC_OBJ)
+  else
+    AC_MSG_ERROR([xwidgets requested, it requires GTK3 as X window toolkit or macOS Cocoa as window system.])
+  fi
 
-  WEBKIT_REQUIRED=2.12
-  WEBKIT_MODULES="webkit2gtk-4.0 >= $WEBKIT_REQUIRED"
-  EMACS_CHECK_MODULES([WEBKIT], [$WEBKIT_MODULES])
-  HAVE_XWIDGETS=$HAVE_WEBKIT
   test $HAVE_XWIDGETS = yes ||
-    AC_MSG_ERROR([xwidgets requested but WebKitGTK+ not found.])
+    AC_MSG_ERROR([xwidgets requested but WebKitGTK+ or WebKit framework not found.])
 
-  XWIDGETS_OBJ=xwidget.o
   AC_DEFINE([HAVE_XWIDGETS], 1, [Define to 1 if you have xwidgets support.])
 fi
 AC_SUBST(XWIDGETS_OBJ)
@@ -5481,7 +5495,8 @@ AC_DEFUN
   Does Emacs directly use zlib?                           ${HAVE_ZLIB}
   Does Emacs have dynamic modules support?                ${HAVE_MODULES}
   Does Emacs use toolkit scroll bars?                     ${USE_TOOLKIT_SCROLL_BARS}
-  Does Emacs support Xwidgets (requires gtk3)?            ${HAVE_XWIDGETS}
+  Does Emacs support Xwidgets?                            ${HAVE_XWIDGETS}
+    (requires gtk3 or macOS Cocoa)
   Does Emacs have threading support in lisp?              ${threads_enabled}
 "])
 
diff --git a/lisp/xwidget.el b/lisp/xwidget.el
index 3bf65d0793..ecae5ee08e 100644
--- a/lisp/xwidget.el
+++ b/lisp/xwidget.el
@@ -39,9 +39,14 @@
 (declare-function xwidget-buffer "xwidget.c" (xwidget))
 (declare-function xwidget-size-request "xwidget.c" (xwidget))
 (declare-function xwidget-resize "xwidget.c" (xwidget new-width new-height))
+;; @callback - Prefer defun to lambda, not to be garbage collected
+;; before its execution in `xwidget-webkit-callback'.
 (declare-function xwidget-webkit-execute-script "xwidget.c"
                   (xwidget script &optional callback))
+(declare-function xwidget-webkit-uri "xwidget.c" (xwidget))
+(declare-function xwidget-webkit-title "xwidget.c" (xwidget))
 (declare-function xwidget-webkit-goto-uri "xwidget.c" (xwidget uri))
+(declare-function xwidget-webkit-goto-history "xwidget.c" (xwidget rel-pos))
 (declare-function xwidget-webkit-zoom "xwidget.c" (xwidget factor))
 (declare-function xwidget-plist "xwidget.c" (xwidget))
 (declare-function set-xwidget-plist "xwidget.c" (xwidget plist))
@@ -78,6 +83,8 @@ xwidget-at
 ;;; webkit support
 (require 'browse-url)
 (require 'image-mode);;for some image-mode alike functionality
+(require 'seq)
+(require 'url-handlers)
 
 ;;;###autoload
 (defun xwidget-webkit-browse-url (url &optional new-session)
@@ -96,6 +103,22 @@ xwidget-webkit-browse-url
         (xwidget-webkit-new-session url)
       (xwidget-webkit-goto-url url))))
 
+(defun xwidget-webkit-cx2 ()
+  "Get the URL of current session, then browse to the URL \
+in `split-window-below' with a new xwidget webkit session."
+  (interactive)
+  (let ((url (xwidget-webkit-current-url)))
+    (with-selected-window (split-window-below)
+      (xwidget-webkit-new-session url))))
+
+(defun xwidget-webkit-cx3 ()
+  "Get the URL of current session, then browse to the URL \
+in `split-window-right' with a new xwidget webkit session."
+  (interactive)
+  (let ((url (xwidget-webkit-current-url)))
+    (with-selected-window (split-window-right)
+      (xwidget-webkit-new-session url))))
+
 ;;todo.
 ;; - check that the webkit support is compiled in
 (defvar xwidget-webkit-mode-map
@@ -103,34 +126,42 @@ xwidget-webkit-mode-map
     (define-key map "g" 'xwidget-webkit-browse-url)
     (define-key map "a" 'xwidget-webkit-adjust-size-dispatch)
     (define-key map "b" 'xwidget-webkit-back)
+    (define-key map "f" 'xwidget-webkit-forward)
     (define-key map "r" 'xwidget-webkit-reload)
     (define-key map "t" (lambda () (interactive) (message "o"))) ;FIXME: ?!?
     (define-key map "\C-m" 'xwidget-webkit-insert-string)
-    (define-key map "w" 'xwidget-webkit-current-url)
+    (define-key map "w" 'xwidget-webkit-current-url-message-kill)
     (define-key map "+" 'xwidget-webkit-zoom-in)
     (define-key map "-" 'xwidget-webkit-zoom-out)
 
     ;;similar to image mode bindings
     (define-key map (kbd "SPC")                 'xwidget-webkit-scroll-up)
+    (define-key map (kbd "S-SPC")               'xwidget-webkit-scroll-down)
     (define-key map (kbd "DEL")                 'xwidget-webkit-scroll-down)
 
-    (define-key map [remap scroll-up]           'xwidget-webkit-scroll-up)
+    (define-key map [remap scroll-up]           'xwidget-webkit-scroll-up-line)
     (define-key map [remap scroll-up-command]   'xwidget-webkit-scroll-up)
 
-    (define-key map [remap scroll-down]         'xwidget-webkit-scroll-down)
+    (define-key map [remap scroll-down]         'xwidget-webkit-scroll-down-line)
     (define-key map [remap scroll-down-command] 'xwidget-webkit-scroll-down)
 
     (define-key map [remap forward-char]        'xwidget-webkit-scroll-forward)
     (define-key map [remap backward-char]       'xwidget-webkit-scroll-backward)
     (define-key map [remap right-char]          'xwidget-webkit-scroll-forward)
     (define-key map [remap left-char]           'xwidget-webkit-scroll-backward)
-    (define-key map [remap previous-line]       'xwidget-webkit-scroll-down)
-    (define-key map [remap next-line]           'xwidget-webkit-scroll-up)
+    (define-key map [remap previous-line]       'xwidget-webkit-scroll-down-line)
+    (define-key map [remap next-line]           'xwidget-webkit-scroll-up-line)
 
     ;; (define-key map [remap move-beginning-of-line] 'image-bol)
     ;; (define-key map [remap move-end-of-line]       'image-eol)
     (define-key map [remap beginning-of-buffer] 'xwidget-webkit-scroll-top)
     (define-key map [remap end-of-buffer]       'xwidget-webkit-scroll-bottom)
+
+    ;; For macOS xwidget webkit, we don't support multiple views for a
+    ;; model, instead, create a new session and model behind the scene.
+    (when (memq window-system '(mac ns))
+      (define-key map (kbd "C-x 2") 'xwidget-webkit-cx2)
+      (define-key map (kbd "C-x 3") 'xwidget-webkit-cx3))
     map)
   "Keymap for `xwidget-webkit-mode'.")
 
@@ -144,19 +175,48 @@ xwidget-webkit-zoom-out
   (interactive)
   (xwidget-webkit-zoom (xwidget-webkit-current-session) -0.1))
 
-(defun xwidget-webkit-scroll-up ()
-  "Scroll webkit up."
-  (interactive)
+(defun xwidget-webkit-scroll-up (&optional n)
+  "Scroll webkit up by N pixels or window height pixels.
+Stop if the bottom edge of the page is reached.
+If N is omitted or nil, scroll up by window height pixels."
+  (interactive "P")
   (xwidget-webkit-execute-script
    (xwidget-webkit-current-session)
-   "window.scrollBy(0, 50);"))
-
-(defun xwidget-webkit-scroll-down ()
-  "Scroll webkit down."
-  (interactive)
+   (cond ((null n)
+          (format "window.scrollBy(0, %d);"
+                  (xwidget-window-inside-pixel-height (selected-window))))
+         (t (format "window.scrollBy(0, %d);" n)))))
+
+(defun xwidget-webkit-scroll-down (&optional n)
+  "Scroll webkit down by N pixels or window height pixels.
+Stop if the top edge of the page is reached.
+If N is omitted or nil, scroll down by window height pixels."
+  (interactive "P")
   (xwidget-webkit-execute-script
    (xwidget-webkit-current-session)
-   "window.scrollBy(0, -50);"))
+   (cond ((null n)
+          (format "window.scrollBy(0, %d);"
+                  (- (xwidget-window-inside-pixel-height (selected-window)))))
+         (t (format "window.scrollBy(0, %d);" (- n))))))
+
+(defvar xwidget-webkit-scroll-line-height 50
+  "Default line height in pixels for scroll xwidget webkit.")
+
+(defun xwidget-webkit-scroll-up-line (&optional n)
+  "Scroll webkit up by N lines.
+The height of line is `xwidget-webkit-scroll-line-height' pixels.
+Stop if the bottom edge of the page is reached.
+If N is omitted or nil, scroll up by one line."
+  (interactive "p")
+  (xwidget-webkit-scroll-up (* n xwidget-webkit-scroll-line-height)))
+
+(defun xwidget-webkit-scroll-down-line (&optional n)
+  "Scroll webkit down by N lines.
+The height of line is `xwidget-webkit-scroll-line-height' pixels.
+Stop if the top edge of the page is reached.
+If N is omitted or nil, scroll down by one line."
+  (interactive "p")
+  (xwidget-webkit-scroll-down (* n xwidget-webkit-scroll-line-height)))
 
 (defun xwidget-webkit-scroll-forward ()
   "Scroll webkit forwards."
@@ -184,7 +244,7 @@ xwidget-webkit-scroll-bottom
   (interactive)
   (xwidget-webkit-execute-script
    (xwidget-webkit-current-session)
-   "window.scrollTo(pageXOffset, window.document.body.clientHeight);"))
+   "window.scrollTo(pageXOffset, window.document.body.scrollHeight);"))
 
 ;; The xwidget event needs to go into a higher level handler
 ;; since the xwidget can generate an event even if it's offscreen.
@@ -192,7 +252,7 @@ xwidget-webkit-scroll-bottom
 (define-key (current-global-map) [xwidget-event] #'xwidget-event-handler)
 (defun xwidget-log (&rest msg)
   "Log MSG to a buffer."
-  (let ((buf (get-buffer-create " *xwidget-log*")))
+  (let ((buf (get-buffer-create "*xwidget-log*")))
     (with-current-buffer buf
       (insert (apply #'format msg))
       (insert "\n"))))
@@ -208,7 +268,6 @@ xwidget-event-handler
        ;;TODO stopped working for some reason
        )
     ;;(funcall  xwidget-callback xwidget xwidget-event-type)
-    (message "xw callback %s" xwidget)
     (funcall  'xwidget-webkit-callback xwidget xwidget-event-type)))
 
 (defun xwidget-webkit-callback (xwidget xwidget-event-type)
@@ -219,43 +278,148 @@ xwidget-webkit-callback
        "error: callback called for xwidget with dead buffer")
     (with-current-buffer (xwidget-buffer xwidget)
       (cond ((eq xwidget-event-type 'load-changed)
-             (xwidget-webkit-execute-script
-              xwidget "document.title"
-              (lambda (title)
-                (xwidget-log "webkit finished loading: '%s'" title)
-                ;;TODO - check the native/internal scroll
-                ;;(xwidget-adjust-size-to-content xwidget)
-                (xwidget-webkit-adjust-size-to-window xwidget)
-                (rename-buffer (format "*xwidget webkit: %s *" title))))
-             (pop-to-buffer (current-buffer)))
+;;; We do not change selected window for the finish of loading a page.
+;;; And do not adjust webkit size to window here, the selected window
+;;; can be the mini-buffer window unwantedly.
+             (let ((title (xwidget-webkit-title xwidget)))
+               (xwidget-log "webkit finished loading: %s" title)
+               (rename-buffer (format "*xwidget webkit: %s *" title) t)))
             ((eq xwidget-event-type 'decide-policy)
              (let ((strarg  (nth 3 last-input-event)))
                (if (string-match ".*#\\(.*\\)" strarg)
                    (xwidget-webkit-show-id-or-named-element
                     xwidget
                     (match-string 1 strarg)))))
+;;; TODO: Response handling other than download.
+            ((eq xwidget-event-type 'response-callback)
+             (let ((url  (nth 3 last-input-event))
+                   (mime-type (nth 4 last-input-event))
+                   (file-name (nth 5 last-input-event)))
+               (xwidget-webkit-save-as-file xwidget url mime-type file-name)))
             ((eq xwidget-event-type 'javascript-callback)
              (let ((proc (nth 3 last-input-event))
                    (arg  (nth 4 last-input-event)))
-               (funcall proc arg)))
+               ;; Some javascript return vector as result
+               (if (vectorp arg)
+                   (funcall proc (seq-into arg 'list))
+                 (funcall proc arg))))
             (t (xwidget-log "unhandled event:%s" xwidget-event-type))))))
 
 (defvar bookmark-make-record-function)
+(defvar isearch-search-fun-function)
+(when (memq window-system '(mac ns))
+  (defvar xwidget-webkit-enable-plugins nil
+    "Enable plugins for xwidget webkit.
+If non-nil, plugins are enabled.  Otherwise, disabled."))
+
 (define-derived-mode xwidget-webkit-mode
     special-mode "xwidget-webkit" "Xwidget webkit view mode."
     (setq buffer-read-only t)
+    (setq cursor-type nil)
     (setq-local bookmark-make-record-function
                 #'xwidget-webkit-bookmark-make-record)
+    (setq-local isearch-search-fun-function
+                #'xwidget-webkit-search-fun-function)
+    (setq-local isearch-lazy-highlight nil)
     ;; Keep track of [vh]scroll when switching buffers
     (image-mode-setup-winprops))
 
+;;; Download, save as file.
+
+(defvar xwidget-webkit-download-dir "~/Downloads/"
+  "Directory where download file saved.")
+
+(defun xwidget-webkit-save-as-file (xwidget url mime-type &optional file-name)
+  "For XWIDGET webkit, save URL resource of MIME-TYPE as FILE-NAME."
+  (ignore xwidget) ;; Not used currently
+  (let ((save-name (read-file-name
+                    (format "Save '%s' file as: " mime-type)
+                    xwidget-webkit-download-dir file-name nil file-name)))
+    (if (file-directory-p save-name)
+        (setq save-name (concat (file-name-as-directory save-name) file-name)))
+    (setq xwidget-webkit-download-dir (file-name-directory save-name))
+    (url-copy-file url save-name t)))
+
+;;; Bookmarks integration
+
+(defvar xwidget-webkit-bookmark-jump-new-session nil
+  "Control bookmark jump to use new session or not.
+If non-nil, it will use a new session.  Otherwise, it will use
+`xwidget-webkit-last-session'.  When you set this variable to
+nil, consider further customization with
+`xwidget-webkit-last-session-buffer'.")
+
 (defun xwidget-webkit-bookmark-make-record ()
   "Integrate Emacs bookmarks with the webkit xwidget."
   (nconc (bookmark-make-record-default t t)
-         `((page     . ,(xwidget-webkit-current-url))
-           (handler  . (lambda (bmk) (browse-url
-                                 (bookmark-prop-get bmk 'page)))))))
-
+         `((filename . ,(xwidget-webkit-current-url))
+           (handler  . (lambda (bmk)
+                         (browse-url
+                          (bookmark-prop-get bmk 'filename)
+                          xwidget-webkit-bookmark-jump-new-session)
+                         (switch-to-buffer
+                          (xwidget-buffer (xwidget-webkit-last-session))))))))
+
+;;; Search text in page
+
+;; Initialize last search text length variable when isearch starts
+(defvar xwidget-webkit-isearch-last-length 0)
+(add-hook 'isearch-mode-hook
+          (lambda ()
+            (setq xwidget-webkit-isearch-last-length 0)))
+
+;; This is minimal. Regex and incremental search will be nice
+(defvar xwidget-webkit-search-js "
+var xwSearchForward = %s;
+var xwSearchRepeat = %s;
+var xwSearchString = '%s';
+if (window.getSelection() && !window.getSelection().isCollapsed) {
+  if (xwSearchRepeat) {
+    if (xwSearchForward)
+      window.getSelection().collapseToEnd();
+    else
+      window.getSelection().collapseToStart();
+  } else {
+    if (xwSearchForward)
+      window.getSelection().collapseToStart();
+    else {
+      var sel = window.getSelection();
+      window.getSelection().collapse(sel.focusNode, sel.focusOffset + 1);
+    }
+  }
+}
+window.find(xwSearchString, false, !xwSearchForward, true, false, true);
+")
+
+(defun xwidget-webkit-search-fun-function ()
+  "Return the function which perform the search in xwidget webkit."
+  (lambda (string &optional bound noerror count)
+    (ignore bound noerror count)
+    (let ((current-length (length string))
+          search-forward
+          search-repeat)
+      ;; Forward or backward
+      (if (eq isearch-forward nil)
+          (setq search-forward "false")
+        (setq search-forward "true"))
+      ;; Repeat if search string length not changed
+      (if (eq current-length xwidget-webkit-isearch-last-length)
+          (setq search-repeat "true")
+        (setq search-repeat "false"))
+      (setq xwidget-webkit-isearch-last-length current-length)
+      (xwidget-webkit-execute-script
+       (xwidget-webkit-current-session)
+       (format xwidget-webkit-search-js
+               search-forward
+               search-repeat
+               (regexp-quote string)))
+      ;; Unconditionally avoid 'Failing I-search ...'
+      (if (eq isearch-forward nil)
+          (goto-char (point-max))
+        (goto-char (point-min)))
+      )))
+
+;;; xwidget webkit session
 
 (defvar xwidget-webkit-last-session-buffer nil)
 
@@ -303,7 +467,7 @@ xwidget-webkit-activeelement-js"
 
 "
 
-  "javascript that finds the active element."
+  "Javascript that finds the active element."
   ;; Yes it's ugly, because:
   ;; - there is apparently no way to find the active frame other than recursion
   ;; - the js "for each" construct misbehaved on the "frames" collection
@@ -313,29 +477,35 @@ xwidget-webkit-activeelement-js"
   )
 
 (defun xwidget-webkit-insert-string ()
-  "Prompt for a string and insert it in the active field in the
+  "Prompt for a string and insert it in the active field in the \
 current webkit widget."
   ;; Read out the string in the field first and provide for edit.
   (interactive)
   (let ((xww (xwidget-webkit-current-session)))
+
+    ;; @javascript-callback
+    (defun xwidget-webkit-insert-string-cb (field)
+      "Prompt a string for the FIELD and insert in the active input."
+      (let ((str (pcase field
+                   (`(,val "text")
+                    (read-string "Text: " val))
+                   (`(,val "password")
+                    (read-passwd "Password: " nil val))
+                   (`(,val "textarea")
+                    (xwidget-webkit-begin-edit-textarea xww val)))))
+        (xwidget-webkit-execute-script
+         xww
+         (format "findactiveelement(document).value='%s'" str))))
+
     (xwidget-webkit-execute-script
      xww
      (concat xwidget-webkit-activeelement-js "
 (function () {
   var res = findactiveelement(document);
-  return [res.value, res.type];
+  if (res)
+    return [res.value, res.type];
 })();")
-     (lambda (field)
-       (let ((str (pcase field
-                    (`[,val "text"]
-                     (read-string "Text: " val))
-                    (`[,val "password"]
-                     (read-passwd "Password: " nil val))
-                    (`[,val "textarea"]
-                     (xwidget-webkit-begin-edit-textarea xww val)))))
-         (xwidget-webkit-execute-script
-          xww
-          (format "findactiveelement(document).value='%s'" str)))))))
+     'xwidget-webkit-insert-string-cb)))
 
 (defvar xwidget-xwbl)
 (defun xwidget-webkit-begin-edit-textarea (xw text)
@@ -444,11 +614,23 @@ xwidget-webkit-adjust-size-dispatch
   (ignore-errors
     (recenter-top-bottom)))
 
+;; Utility functions, wanted in `window.el'
+
+(defun xwidget-window-inside-pixel-width (window)
+  "Return Emacs WINDOW body width in pixel."
+  (let ((edges (window-inside-pixel-edges window)))
+    (- (nth 2 edges) (nth 0 edges))))
+
+(defun xwidget-window-inside-pixel-height (window)
+  "Return Emacs WINDOW body height in pixel."
+  (let ((edges (window-inside-pixel-edges window)))
+    (- (nth 3 edges) (nth 1 edges))))
+
 (defun xwidget-webkit-adjust-size-to-window (xwidget &optional window)
   "Adjust the size of the webkit XWIDGET to fit the WINDOW."
   (xwidget-resize xwidget
-                  (window-pixel-width window)
-                  (window-pixel-height window)))
+                  (xwidget-window-inside-pixel-width window)
+                  (xwidget-window-inside-pixel-height window)))
 
 (defun xwidget-webkit-adjust-size (w h)
   "Manually set webkit size to width W, height H."
@@ -487,10 +669,12 @@ xwidget-webkit-new-session
                                               (get-buffer-create bufname)))
     ;; The xwidget id is stored in a text property, so we need to have
     ;; at least character in this buffer.
-    (insert " ")
+    ;; Insert invisible url, good default for next `g' to browse url.
+    (insert url)
+    (put-text-property 1 (+ 1 (length url)) 'invisible t)
     (setq xw (xwidget-insert 1 'webkit bufname
-                             (window-pixel-width)
-                             (window-pixel-height)))
+                             (xwidget-window-inside-pixel-width (selected-window))
+                             (xwidget-window-inside-pixel-height (selected-window))))
     (xwidget-put xw 'callback 'xwidget-webkit-callback)
     (xwidget-webkit-mode)
     (xwidget-webkit-goto-uri (xwidget-webkit-last-session) url)))
@@ -506,23 +690,27 @@ xwidget-webkit-goto-url
 (defun xwidget-webkit-back ()
   "Go back in history."
   (interactive)
-  (xwidget-webkit-execute-script (xwidget-webkit-current-session)
-                                 "history.go(-1);"))
+  (xwidget-webkit-goto-history (xwidget-webkit-current-session) -1))
+
+(defun xwidget-webkit-forward ()
+  "Go forward in history."
+  (interactive)
+  (xwidget-webkit-goto-history (xwidget-webkit-current-session) 1))
 
 (defun xwidget-webkit-reload ()
-  "Reload current url."
+  "Reload current URL."
   (interactive)
-  (xwidget-webkit-execute-script (xwidget-webkit-current-session)
-                                 "history.go(0);"))
+  (xwidget-webkit-goto-history (xwidget-webkit-current-session) 0))
 
 (defun xwidget-webkit-current-url ()
-  "Get the webkit url and place it on the kill-ring."
+  "Get the current xwidget webkit URL."
   (interactive)
-  (xwidget-webkit-execute-script
-   (xwidget-webkit-current-session)
-   "document.URL" (lambda (rv)
-                    (let ((url (kill-new (or rv ""))))
-                      (message "url: %s" url)))))
+  (xwidget-webkit-uri (xwidget-webkit-current-session)))
+
+(defun xwidget-webkit-current-url-message-kill ()
+  "Message the current xwidget webkit URL and place it on the `kill-ring'."
+  (interactive)
+  (message "url: %s" (kill-new (or (xwidget-webkit-current-url) ""))))
 
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 (defun xwidget-webkit-get-selection (proc)
@@ -533,10 +721,9 @@ xwidget-webkit-get-selection
    proc))
 
 (defun xwidget-webkit-copy-selection-as-kill ()
-  "Get the webkit selection and put it on the kill-ring."
+  "Get the webkit selection and put it on the `kill-ring'."
   (interactive)
-  (xwidget-webkit-get-selection (lambda (selection) (kill-new selection))))
-
+  (xwidget-webkit-get-selection #'kill-new))
 
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 ;; Xwidget plist management (similar to the process plist functions)
diff --git a/nextstep/templates/Info.plist.in b/nextstep/templates/Info.plist.in
index 9960f085f6..064d3d270c 100644
--- a/nextstep/templates/Info.plist.in
+++ b/nextstep/templates/Info.plist.in
@@ -675,5 +675,13 @@ along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
 	</array>
 	<key>NSAppleScriptEnabled</key>
 	<string>YES</string>
+        <!-- For xwidget webkit to browse remote url,
+             but this set no restriction at all.  Consult apple's documentation
+             for detail information about `NSApplicationDefinedMask'. -->
+        <key>NSAppTransportSecurity</key>
+        <dict>
+          <key>NSAllowsArbitraryLoads</key>
+          <true/>
+        </dict>
 </dict>
 </plist>
diff --git a/src/Makefile.in b/src/Makefile.in
index a1ec0bd7f7..2ddb3f05c3 100644
--- a/src/Makefile.in
+++ b/src/Makefile.in
@@ -414,6 +414,7 @@ SOME_MACHINE_OBJECTS =
   xterm.o xfns.o xmenu.o xselect.o xrdb.o xsmfns.o fringe.o image.o \
   fontset.o dbusbind.o cygw32.o \
   nsterm.o nsfns.o nsmenu.o nsselect.o nsimage.o nsfont.o macfont.o \
+  nsxwidget.o \
   w32.o w32console.o w32cygwinx.o w32fns.o w32heap.o w32inevt.o w32notify.o \
   w32menu.o w32proc.o w32reg.o w32select.o w32term.o w32xfns.o \
   w16select.o widget.o xfont.o ftfont.o xftfont.o ftxfont.o gtkutil.o \
diff --git a/src/emacs.c b/src/emacs.c
index 8633e934e5..07ca5ea4d3 100644
--- a/src/emacs.c
+++ b/src/emacs.c
@@ -1541,7 +1541,6 @@ Using an Emacs configured with --with-x-toolkit=lucid does not have this problem
       syms_of_xfns ();
       syms_of_xmenu ();
       syms_of_fontset ();
-      syms_of_xwidget ();
       syms_of_xsettings ();
 #ifdef HAVE_X_SM
       syms_of_xsmfns ();
@@ -1618,6 +1617,10 @@ Using an Emacs configured with --with-x-toolkit=lucid does not have this problem
 #endif /* HAVE_W32NOTIFY */
 #endif /* WINDOWSNT */
 
+#ifdef HAVE_XWIDGETS
+      syms_of_xwidget ();
+#endif /* HAVE_XWIDGETS */
+
       syms_of_threads ();
       syms_of_profiler ();
 
diff --git a/src/nsterm.m b/src/nsterm.m
index c0d2d91fde..d6ffc9801e 100644
--- a/src/nsterm.m
+++ b/src/nsterm.m
@@ -49,6 +49,7 @@ Updated by Christian Limpach (chris@nice.ch)
 #include "nsterm.h"
 #include "systime.h"
 #include "character.h"
+#include "xwidget.h"
 #include "fontset.h"
 #include "composite.h"
 #include "ccl.h"
@@ -2525,7 +2526,7 @@ so some key presses (TAB) are swallowed by the system.  */
 }
 
 static int
-note_mouse_movement (struct frame *frame, CGFloat x, CGFloat y)
+note_mouse_movement (struct frame *frame, CGFloat x, CGFloat y, BOOL dragging)
 /*   ------------------------------------------------------------------------
      Called by EmacsView on mouseMovement events.  Passes on
      to emacs mainstream code if we moved off of a rect of interest
@@ -2534,17 +2535,24 @@ so some key presses (TAB) are swallowed by the system.  */
 {
   struct ns_display_info *dpyinfo = FRAME_DISPLAY_INFO (frame);
   NSRect *r;
+  BOOL force_update = NO;
 
   // NSTRACE ("note_mouse_movement");
 
   dpyinfo->last_mouse_motion_frame = frame;
   r = &dpyinfo->last_mouse_glyph;
 
+  /* If the last rect is too large (ex, xwidget webkit), update at
+     every move, or resizing by dragging modeline or vertical split is
+     very hard to make its way.  */
+  if (dragging && (r->size.width > 32 || r->size.height > 32))
+    force_update = YES;
+
   /* Note, this doesn't get called for enter/leave, since we don't have a
      position.  Those are taken care of in the corresponding NSView methods.  */
 
-  /* Has movement gone beyond last rect we were tracking?  */
-  if (x < r->origin.x || x >= r->origin.x + r->size.width
+  /* Has movement gone beyond last rect we were tracking? */
+  if (force_update || x < r->origin.x || x >= r->origin.x + r->size.width
       || y < r->origin.y || y >= r->origin.y + r->size.height)
     {
       ns_update_begin (frame);
@@ -4248,6 +4256,10 @@ overwriting cursor (usually when cursor on a tab).  */
       ns_unfocus (s->f);
       break;
 
+    case XWIDGET_GLYPH:
+      x_draw_xwidget_glyph_string (s);
+      break;
+
     case STRETCH_GLYPH:
       ns_dumpglyphs_stretch (s);
       break;
@@ -6852,6 +6864,7 @@ - (void)mouseMoved: (NSEvent *)e
   struct ns_display_info *dpyinfo = FRAME_DISPLAY_INFO (emacsframe);
   Lisp_Object frame;
   NSPoint pt;
+  BOOL dragging;
 
   NSTRACE_WHEN (NSTRACE_GROUP_EVENTS, "[EmacsView mouseMoved:]");
 
@@ -6894,7 +6907,8 @@ - (void)mouseMoved: (NSEvent *)e
       last_mouse_window = window;
     }
 
-  if (!note_mouse_movement (emacsframe, pt.x, pt.y))
+  dragging = (e.type == NSEventTypeLeftMouseDragged);
+  if (!note_mouse_movement (emacsframe, pt.x, pt.y, dragging))
     help_echo_string = previous_help_echo_string;
 
   XSETFRAME (frame, emacsframe);
diff --git a/src/nsxwidget.h b/src/nsxwidget.h
new file mode 100644
index 0000000000..6af5fe5a4d
--- /dev/null
+++ b/src/nsxwidget.h
@@ -0,0 +1,80 @@
+/* Header for NS Cocoa part of xwidget and webkit widget.
+
+Copyright (C) 2011-2017 Free Software Foundation, Inc.
+
+This file is part of GNU Emacs.
+
+GNU Emacs is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or (at
+your option) any later version.
+
+GNU Emacs is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#ifndef NSXWIDGET_H_INCLUDED
+#define NSXWIDGET_H_INCLUDED
+
+/* This file can be included from non-objc files through 'xwidget.h'.  */
+#ifdef __OBJC__
+#import <AppKit/NSView.h>
+#endif
+
+#include "dispextern.h"
+#include "lisp.h"
+#include "xwidget.h"
+
+/* Functions for xwidget webkit.  */
+
+bool nsxwidget_is_web_view (struct xwidget *xw);
+Lisp_Object nsxwidget_webkit_uri (struct xwidget *xw);
+Lisp_Object nsxwidget_webkit_title (struct xwidget *xw);
+void nsxwidget_webkit_goto_uri (struct xwidget *xw, const char *uri);
+void nsxwidget_webkit_goto_history (struct xwidget *xw, int rel_pos);
+void nsxwidget_webkit_zoom (struct xwidget *xw, double zoom_change);
+void nsxwidget_webkit_execute_script (struct xwidget *xw, const char *script,
+                                      Lisp_Object fun);
+
+/* Functions for xwidget model.  */
+
+#ifdef __OBJC__
+@interface XwWindow : NSView
+@property struct xwidget *xw;
+@end
+#endif
+
+void nsxwidget_init (struct xwidget *xw);
+void nsxwidget_kill (struct xwidget *xw);
+void nsxwidget_resize (struct xwidget *xw);
+Lisp_Object nsxwidget_get_size (struct xwidget *xw);
+
+/* Functions for xwidget view.  */
+
+#ifdef __OBJC__
+@interface XvWindow : NSView
+@property struct xwidget *xw;
+@property struct xwidget_view *xv;
+@end
+#endif
+
+void nsxwidget_init_view (struct xwidget_view *xv,
+                          struct xwidget *xww,
+                          struct glyph_string *s,
+                          int x, int y);
+void nsxwidget_delete_view (struct xwidget_view *xv);
+
+void nsxwidget_show_view (struct xwidget_view *xv);
+void nsxwidget_hide_view (struct xwidget_view *xv);
+void nsxwidget_resize_view (struct xwidget_view *xv,
+                            int widget, int height);
+
+void nsxwidget_move_view (struct xwidget_view *xv, int x, int y);
+void nsxwidget_move_widget_in_view (struct xwidget_view *xv, int x, int y);
+void nsxwidget_set_needsdisplay (struct xwidget_view *xv);
+
+#endif /* NSXWIDGET_H_INCLUDED */
diff --git a/src/nsxwidget.m b/src/nsxwidget.m
new file mode 100644
index 0000000000..22baaecedf
--- /dev/null
+++ b/src/nsxwidget.m
@@ -0,0 +1,625 @@
+/* NS Cocoa part implementation of xwidget and webkit widget.
+
+Copyright (C) 1989, 1992-1994, 2005-2006, 2008-2017 Free Software
+Foundation, Inc.
+
+This file is part of GNU Emacs.
+
+GNU Emacs is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or (at
+your option) any later version.
+
+GNU Emacs is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#include <config.h>
+
+#include "lisp.h"
+#include "blockinput.h"
+#include "dispextern.h"
+#include "buffer.h"
+#include "frame.h"
+#include "nsterm.h"
+#include "xwidget.h"
+
+/* Defined in 'xwidget.c'.  */
+void store_xwidget_event_string (struct xwidget *xw,
+                                 const char *eventname,
+                                 const char *eventstr);
+
+void store_xwidget_response_callback_event (struct xwidget *xw,
+                                            const char *url,
+                                            const char *mimetype,
+                                            const char *filename);
+
+void store_xwidget_js_callback_event (struct xwidget *xw,
+                                      Lisp_Object proc,
+                                      Lisp_Object argument);
+
+#import <AppKit/AppKit.h>
+#import <WebKit/WebKit.h>
+
+/* Thoughts on NS Cocoa xwidget and webkit2:
+
+   Webkit2 process architecture seems to be very hostile for offscreen
+   rendering techniques, which is used by GTK xwiget implementation;
+   Specifically NSView level view sharing / copying is not working.
+
+   *** So only one view can be associcated with a model. ***
+
+   With this decision, implementation is plain and can expect best out
+   of webkit2's rationale.  But process and session structures will
+   diverge from GTK xwiget.  Though, cosmetically similar usages can
+   be presented and will be preferred, if agreeable.
+
+   For other widget types, OSR seems possible, but will not care for a
+   while.  */
+
+/* Xwidget webkit.  */
+
+@interface XwWebView : WKWebView
+<WKNavigationDelegate, WKUIDelegate, WKScriptMessageHandler>
+@property struct xwidget *xw;
+/* Map url to whether javascript is blocked by
+   'Content-Security-Policy' sandbox without allow-scripts.  */
+@property(retain) NSMutableDictionary *urlScriptBlocked;
+@end
+@implementation XwWebView : WKWebView
+
+- (id)initWithFrame:(CGRect)frame
+      configuration:(WKWebViewConfiguration *)configuration
+            xwidget:(struct xwidget *)xw
+{
+  /* Script controller to add script message handler and user script.  */
+  WKUserContentController *scriptor = [[WKUserContentController alloc] init];
+  configuration.userContentController = scriptor;
+
+  /* Enable inspect element context menu item for debugging.  */
+  [configuration.preferences setValue:@YES
+                               forKey:@"developerExtrasEnabled"];
+
+  Lisp_Object enablePlugins =
+    Fintern (build_string ("xwidget-webkit-enable-plugins"), Qnil);
+  if (!EQ (Fsymbol_value (enablePlugins), Qnil))
+    configuration.preferences.plugInsEnabled = YES;
+
+  self = [super initWithFrame:frame configuration:configuration];
+  if (self)
+    {
+      self.xw = xw;
+      self.urlScriptBlocked = [[NSMutableDictionary alloc] init];
+      self.navigationDelegate = self;
+      self.UIDelegate = self;
+      self.customUserAgent =
+        @"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6)"
+        @" AppleWebKit/603.3.8 (KHTML, like Gecko)"
+        @" Version/11.0.1 Safari/603.3.8";
+      [scriptor addScriptMessageHandler:self name:@"keyDown"];
+      [scriptor addUserScript:[[WKUserScript alloc]
+                                initWithSource:xwScript
+                                 injectionTime:
+                                  WKUserScriptInjectionTimeAtDocumentStart
+                                forMainFrameOnly:NO]];
+    }
+  return self;
+}
+
+#if 0
+/* Non ARC - just to check lifecycle.  */
+- (void)dealloc
+{
+  NSLog (@"XwWebView dealloc");
+  [super dealloc];
+}
+#endif
+
+- (void)webView:(WKWebView *)webView
+didFinishNavigation:(WKNavigation *)navigation
+{
+  if (EQ (Fbuffer_live_p (self.xw->buffer), Qt))
+    store_xwidget_event_string (self.xw, "load-changed", "");
+}
+
+- (void)webView:(WKWebView *)webView
+decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction
+decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler
+{
+  switch (navigationAction.navigationType) {
+  case WKNavigationTypeLinkActivated:
+    decisionHandler (WKNavigationActionPolicyAllow);
+    break;
+  default:
+    // decisionHandler (WKNavigationActionPolicyCancel);
+    decisionHandler (WKNavigationActionPolicyAllow);
+    break;
+  }
+}
+
+- (void)webView:(WKWebView *)webView
+decidePolicyForNavigationResponse:(WKNavigationResponse *)navigationResponse
+decisionHandler:(void (^)(WKNavigationResponsePolicy))decisionHandler
+{
+  if (!navigationResponse.canShowMIMEType)
+    {
+      NSString *url = navigationResponse.response.URL.absoluteString;
+      NSString *mimetype = navigationResponse.response.MIMEType;
+      NSString *filename = navigationResponse.response.suggestedFilename;
+      decisionHandler (WKNavigationResponsePolicyCancel);
+      store_xwidget_response_callback_event (self.xw,
+                                             url.UTF8String,
+                                             mimetype.UTF8String,
+                                             filename.UTF8String);
+      return;
+    }
+  decisionHandler (WKNavigationResponsePolicyAllow);
+
+  self.urlScriptBlocked[navigationResponse.response.URL] =
+    [NSNumber numberWithBool:NO];
+  if ([navigationResponse.response isKindOfClass:[NSHTTPURLResponse class]])
+    {
+      NSDictionary *headers =
+        ((NSHTTPURLResponse *) navigationResponse.response).allHeaderFields;
+      NSString *value = headers[@"Content-Security-Policy"];
+      if (value)
+        {
+          /* TODO: Sloppy parsing of 'Content-Security-Policy' value.  */
+          NSRange sandbox = [value rangeOfString:@"sandbox"];
+          if (sandbox.location != NSNotFound
+              && (sandbox.location == 0
+                  || [value characterAtIndex:(sandbox.location - 1)] == ' '
+                  || [value characterAtIndex:(sandbox.location - 1)] == ';'))
+            {
+              NSRange allowScripts = [value rangeOfString:@"allow-scripts"];
+              if (allowScripts.location == NSNotFound
+                  || allowScripts.location < sandbox.location)
+                self.urlScriptBlocked[navigationResponse.response.URL] =
+                  [NSNumber numberWithBool:YES];
+            }
+        }
+    }
+}
+
+/* No additional new webview or emacs window will be created
+   for <a ... target="_blank">.  */
+- (WKWebView *)webView:(WKWebView *)webView
+createWebViewWithConfiguration:(WKWebViewConfiguration *)configuration
+   forNavigationAction:(WKNavigationAction *)navigationAction
+        windowFeatures:(WKWindowFeatures *)windowFeatures
+{
+  if (!navigationAction.targetFrame.isMainFrame)
+    [webView loadRequest:navigationAction.request];
+  return nil;
+}
+
+/* Open panel for file upload.  */
+- (void)webView:(WKWebView *)webView
+runOpenPanelWithParameters:(WKOpenPanelParameters *)parameters
+initiatedByFrame:(WKFrameInfo *)frame
+completionHandler:(void (^)(NSArray<NSURL *> *URLs))completionHandler
+{
+  NSOpenPanel *openPanel = [NSOpenPanel openPanel];
+  openPanel.canChooseFiles = YES;
+  openPanel.canChooseDirectories = NO;
+  openPanel.allowsMultipleSelection = parameters.allowsMultipleSelection;
+  if ([openPanel runModal] == NSModalResponseOK)
+    completionHandler (openPanel.URLs);
+  else
+    completionHandler (nil);
+}
+
+/* By forwarding mouse events to emacs view (frame)
+   - Mouse click in webview selects the window contains the webview.
+   - Correct mouse hand/arrow/I-beam is displayed (TODO: not perfect yet).
+*/
+
+- (void)mouseDown:(NSEvent *)event
+{
+  [self.xw->xv->emacswindow mouseDown:event];
+  [super mouseDown:event];
+}
+
+- (void)mouseUp:(NSEvent *)event
+{
+  [self.xw->xv->emacswindow mouseUp:event];
+  [super mouseUp:event];
+}
+
+/* Basically we want keyboard events handled by emacs unless an input
+   element has focus.  Especially, while incremental search, we set
+   emacs as first responder to avoid focus held in an input element
+   with matching text.  */
+
+- (void)keyDown:(NSEvent *)event
+{
+  Lisp_Object var = Fintern (build_string ("isearch-mode"), Qnil);
+  Lisp_Object val = buffer_local_value (var, Fcurrent_buffer ());
+  if (!EQ (val, Qunbound) && !EQ (val, Qnil))
+    {
+      [self.window makeFirstResponder:self.xw->xv->emacswindow];
+      [self.xw->xv->emacswindow keyDown:event];
+      return;
+    }
+
+  /* Emacs handles keyboard events when javascript is blocked.  */
+  if ([self.urlScriptBlocked[self.URL] boolValue])
+    {
+      [self.xw->xv->emacswindow keyDown:event];
+      return;
+    }
+
+  [self evaluateJavaScript:@"xwHasFocus()"
+         completionHandler:^(id result, NSError *error) {
+      if (error)
+        {
+          NSLog (@"xwHasFocus: %@", error);
+          [self.xw->xv->emacswindow keyDown:event];
+        }
+      else if (result)
+        {
+          NSNumber *hasFocus = result; /* __NSCFBoolean */
+          if (!hasFocus.boolValue)
+            [self.xw->xv->emacswindow keyDown:event];
+          else
+            [super keyDown:event];
+        }
+    }];
+}
+
+- (void)interpretKeyEvents:(NSArray<NSEvent *> *)eventArray
+{
+  /* We should do nothing and do not forward (default implementation
+     if we not override here) to let emacs collect key events and ask
+     interpretKeyEvents to its superclass.  */
+}
+
+static NSString *xwScript;
++ (void)initialize
+{
+  /* Find out if an input element has focus.
+     Message to script message handler when 'C-g' key down.  */
+  if (!xwScript)
+    xwScript =
+      @"function xwHasFocus() {"
+      @"  var ae = document.activeElement;"
+      @"  if (ae) {"
+      @"    var name = ae.nodeName;"
+      @"    return name == 'INPUT' || name == 'TEXTAREA';"
+      @"  } else {"
+      @"    return false;"
+      @"  }"
+      @"}"
+      @"function xwKeyDown(event) {"
+      @"  if (event.ctrlKey && event.key == 'g') {"
+      @"    window.webkit.messageHandlers.keyDown.postMessage('C-g');"
+      @"  }"
+      @"}"
+      @"document.addEventListener('keydown', xwKeyDown);"
+      ;
+}
+
+/* Confirming to WKScriptMessageHandler, listens concerning keyDown in
+   webkit. Currently 'C-g'.  */
+- (void)userContentController:(WKUserContentController *)userContentController
+      didReceiveScriptMessage:(WKScriptMessage *)message
+{
+  if ([message.body isEqualToString:@"C-g"])
+    {
+      /* Just give up focus, no relay "C-g" to emacs, another "C-g"
+         follows will be handled by emacs.  */
+      [self.window makeFirstResponder:self.xw->xv->emacswindow];
+    }
+}
+
+@end
+
+/* Xwidget webkit commands.  */
+
+static Lisp_Object build_string_with_nsstr (NSString *nsstr);
+
+bool
+nsxwidget_is_web_view (struct xwidget *xw)
+{
+  return xw->xwWidget != NULL &&
+    [xw->xwWidget isKindOfClass:WKWebView.class];
+}
+
+Lisp_Object
+nsxwidget_webkit_uri (struct xwidget *xw)
+{
+  XwWebView *xwWebView = (XwWebView *) xw->xwWidget;
+  return build_string_with_nsstr (xwWebView.URL.absoluteString);
+}
+
+Lisp_Object
+nsxwidget_webkit_title (struct xwidget *xw)
+{
+  XwWebView *xwWebView = (XwWebView *) xw->xwWidget;
+  return build_string_with_nsstr (xwWebView.title);
+}
+
+/* @Note ATS - Need application transport security in 'Info.plist' or
+   remote pages will not loaded.  */
+void
+nsxwidget_webkit_goto_uri (struct xwidget *xw, const char *uri)
+{
+  XwWebView *xwWebView = (XwWebView *) xw->xwWidget;
+  NSString *urlString = [NSString stringWithUTF8String:uri];
+  NSURL *url = [NSURL URLWithString:urlString];
+  NSURLRequest *urlRequest = [NSURLRequest requestWithURL:url];
+  [xwWebView loadRequest:urlRequest];
+}
+
+void
+nsxwidget_webkit_goto_history (struct xwidget *xw, int rel_pos)
+{
+  XwWebView *xwWebView = (XwWebView *) xw->xwWidget;
+  switch (rel_pos) {
+  case -1: [xwWebView goBack]; break;
+  case 0: [xwWebView reload]; break;
+  case 1: [xwWebView goForward]; break;
+  }
+}
+
+void
+nsxwidget_webkit_zoom (struct xwidget *xw, double zoom_change)
+{
+  XwWebView *xwWebView = (XwWebView *) xw->xwWidget;
+  xwWebView.magnification += zoom_change;
+  /* TODO: setMagnification:centeredAtPoint.  */
+}
+
+/* Build lisp string */
+static Lisp_Object
+build_string_with_nsstr (NSString *nsstr)
+{
+  const char *utfstr = [nsstr UTF8String];
+  NSUInteger bytes = [nsstr lengthOfBytesUsingEncoding:NSUTF8StringEncoding];
+  return make_string (utfstr, bytes);
+}
+
+/* Recursively convert an objc native type JavaScript value to a Lisp
+   value.  Mostly copied from GTK xwidget 'webkit_js_to_lisp'.  */
+static Lisp_Object
+js_to_lisp (id value)
+{
+  if (value == nil || [value isKindOfClass:NSNull.class])
+    return Qnil;
+  else if ([value isKindOfClass:NSString.class])
+    return build_string_with_nsstr ((NSString *) value);
+  else if ([value isKindOfClass:NSNumber.class])
+    {
+      NSNumber *nsnum = (NSNumber *) value;
+      char type = nsnum.objCType[0];
+      if (type == 'c') /* __NSCFBoolean has type character 'c'.  */
+        return nsnum.boolValue? Qt : Qnil;
+      else
+        {
+          if (type == 'i' || type == 'l')
+            return make_number (nsnum.longValue);
+          else if (type == 'f' || type == 'd')
+            return make_float (nsnum.doubleValue);
+          /* else fall through.  */
+        }
+    }
+  else if ([value isKindOfClass:NSArray.class])
+    {
+      NSArray *nsarr = (NSArray *) value;
+      EMACS_INT n = nsarr.count;
+      Lisp_Object obj;
+      struct Lisp_Vector *p = allocate_vector (n);
+
+      for (ptrdiff_t i = 0; i < n; ++i)
+        p->contents[i] = js_to_lisp ([nsarr objectAtIndex:i]);
+      XSETVECTOR (obj, p);
+      return obj;
+    }
+  else if ([value isKindOfClass:NSDictionary.class])
+    {
+      NSDictionary *nsdict = (NSDictionary *) value;
+      NSArray *keys = nsdict.allKeys;
+      ptrdiff_t n = keys.count;
+      Lisp_Object obj;
+      struct Lisp_Vector *p = allocate_vector (n);
+
+      for (ptrdiff_t i = 0; i < n; ++i)
+        {
+          NSString *prop_key = (NSString *) [keys objectAtIndex:i];
+          id prop_value = [nsdict valueForKey:prop_key];
+          p->contents[i] = Fcons (build_string_with_nsstr (prop_key),
+                                  js_to_lisp (prop_value));
+        }
+      XSETVECTOR (obj, p);
+      return obj;
+    }
+  NSLog (@"Unhandled type in javascript result");
+  return Qnil;
+}
+
+void
+nsxwidget_webkit_execute_script (struct xwidget *xw, const char *script,
+                                 Lisp_Object fun)
+{
+  XwWebView *xwWebView = (XwWebView *) xw->xwWidget;
+  if ([xwWebView.urlScriptBlocked[xwWebView.URL] boolValue])
+    {
+      message ("Javascript is blocked by 'CSP: sandbox'.");
+      return;
+    }
+
+  NSString *javascriptString = [NSString stringWithUTF8String:script];
+  [xwWebView evaluateJavaScript:javascriptString
+              completionHandler:^(id result, NSError *error) {
+      if (error)
+        {
+          NSLog (@"evaluateJavaScript error : %@", error.localizedDescription);
+          NSLog (@"error script=%@", javascriptString);
+        }
+      else if (result && FUNCTIONP (fun))
+        {
+          // NSLog (@"result=%@, type=%@", result, [result class]);
+          Lisp_Object lisp_value = js_to_lisp (result);
+          store_xwidget_js_callback_event (xw, fun, lisp_value);
+        }
+    }];
+}
+
+/* Window containing an xwidget.  */
+
+@implementation XwWindow
+- (BOOL)isFlipped { return YES; }
+@end
+
+/* Xwidget model, macOS Cocoa part.  */
+
+void
+nsxwidget_init(struct xwidget *xw)
+{
+  block_input ();
+  NSRect rect = NSMakeRect (0, 0, xw->width, xw->height);
+  xw->xwWidget = [[XwWebView alloc]
+                   initWithFrame:rect
+                   configuration:[[WKWebViewConfiguration alloc] init]
+                         xwidget:xw];
+  xw->xwWindow = [[XwWindow alloc]
+                   initWithFrame:rect];
+  [xw->xwWindow addSubview:xw->xwWidget];
+  xw->xv = NULL; /* for 1 to 1 relationship of webkit2.  */
+  unblock_input ();
+}
+
+void
+nsxwidget_kill (struct xwidget *xw)
+{
+  if (xw)
+    {
+      WKUserContentController *scriptor =
+        ((XwWebView *) xw->xwWidget).configuration.userContentController;
+      [scriptor removeAllUserScripts];
+      [scriptor removeScriptMessageHandlerForName:@"keyDown"];
+      [scriptor release];
+      if (xw->xv)
+        xw->xv->model = Qnil; /* Make sure related view stale.  */
+
+      /* This stops playing audio when a xwidget-webkit buffer is
+         killed.  I could not find other solution.  */
+      nsxwidget_webkit_goto_uri (xw, "about:blank");
+
+      [((XwWebView *) xw->xwWidget).urlScriptBlocked release];
+      [xw->xwWidget removeFromSuperviewWithoutNeedingDisplay];
+      [xw->xwWidget release];
+      [xw->xwWindow removeFromSuperviewWithoutNeedingDisplay];
+      [xw->xwWindow release];
+      xw->xwWidget = nil;
+    }
+}
+
+void
+nsxwidget_resize (struct xwidget *xw)
+{
+  if (xw->xwWidget)
+    {
+      [xw->xwWindow setFrameSize:NSMakeSize(xw->width, xw->height)];
+      [xw->xwWidget setFrameSize:NSMakeSize(xw->width, xw->height)];
+    }
+}
+
+Lisp_Object
+nsxwidget_get_size (struct xwidget *xw)
+{
+  return list2 (make_number (xw->xwWidget.frame.size.width),
+                make_number (xw->xwWidget.frame.size.height));
+}
+
+/* Xwidget view, macOS Cocoa part.  */
+
+@implementation XvWindow : NSView
+- (BOOL)isFlipped { return YES; }
+@end
+
+void
+nsxwidget_init_view (struct xwidget_view *xv,
+                     struct xwidget *xw,
+                     struct glyph_string *s,
+                     int x, int y)
+{
+  /* 'x_draw_xwidget_glyph_string' will calculate correct position and
+     size of clip to draw in emacs buffer window.  Thus, just begin at
+     origin with no crop.  */
+  xv->x = x;
+  xv->y = y;
+  xv->clip_left = 0;
+  xv->clip_right = xw->width;
+  xv->clip_top = 0;
+  xv->clip_bottom = xw->height;
+
+  xv->xvWindow = [[XvWindow alloc]
+                   initWithFrame:NSMakeRect (x, y, xw->width, xw->height)];
+  xv->xvWindow.xw = xw;
+  xv->xvWindow.xv = xv;
+
+  xw->xv = xv; /* For 1 to 1 relationship of webkit2.  */
+  [xv->xvWindow addSubview:xw->xwWindow];
+
+  xv->emacswindow = FRAME_NS_VIEW (s->f);
+  [xv->emacswindow addSubview:xv->xvWindow];
+}
+
+void
+nsxwidget_delete_view (struct xwidget_view *xv)
+{
+  if (!EQ (xv->model, Qnil))
+    {
+      struct xwidget *xw = XXWIDGET (xv->model);
+      [xw->xwWindow removeFromSuperviewWithoutNeedingDisplay];
+      xw->xv = NULL; /* Now model has no view.  */
+    }
+  [xv->xvWindow removeFromSuperviewWithoutNeedingDisplay];
+  [xv->xvWindow release];
+}
+
+void
+nsxwidget_show_view (struct xwidget_view *xv)
+{
+  xv->hidden = NO;
+  [xv->xvWindow setFrameOrigin:NSMakePoint(xv->x + xv->clip_left,
+                                           xv->y + xv->clip_top)];
+}
+
+void
+nsxwidget_hide_view (struct xwidget_view *xv)
+{
+  xv->hidden = YES;
+  [xv->xvWindow setFrameOrigin:NSMakePoint(10000, 10000)];
+}
+
+void
+nsxwidget_resize_view (struct xwidget_view *xv, int width, int height)
+{
+  [xv->xvWindow setFrameSize:NSMakeSize(width, height)];
+}
+
+void
+nsxwidget_move_view (struct xwidget_view *xv, int x, int y)
+{
+  [xv->xvWindow setFrameOrigin:NSMakePoint (x, y)];
+}
+
+/* Move model window in container (view window).  */
+void
+nsxwidget_move_widget_in_view (struct xwidget_view *xv, int x, int y)
+{
+  struct xwidget *xww = xv->xvWindow.xw;
+  [xww->xwWindow setFrameOrigin:NSMakePoint (x, y)];
+}
+
+void
+nsxwidget_set_needsdisplay (struct xwidget_view *xv)
+{
+  xv->xvWindow.needsDisplay = YES;
+}
diff --git a/src/xwidget.c b/src/xwidget.c
index 5f2651214e..a41ebcdcde 100644
--- a/src/xwidget.c
+++ b/src/xwidget.c
@@ -18,17 +18,26 @@ You should have received a copy of the GNU General Public License
 along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.  */
 
 #include <config.h>
+#include <stdio.h> /* FIXME: Emacs error? message? instead of printf.  */
 
 #include "xwidget.h"
 
 #include "lisp.h"
 #include "blockinput.h"
+#include "dispextern.h"
 #include "frame.h"
 #include "keyboard.h"
 #include "gtkutil.h"
+#include "termhooks.h"
+#include "window.h"
 
+/* Include xwidget bottom end headers.  */
+#if defined (USE_GTK)
 #include <webkit2/webkit2.h>
 #include <JavaScriptCore/JavaScript.h>
+#elif defined (NS_IMPL_COCOA)
+#include "nsxwidget.h"
+#endif
 
 static struct xwidget *
 allocate_xwidget (void)
@@ -48,6 +57,7 @@ allocate_xwidget_view (void)
 
 static struct xwidget_view *xwidget_view_lookup (struct xwidget *,
 						 struct window *);
+#if defined (USE_GTK)
 static void webkit_view_load_changed_cb (WebKitWebView *,
                                          WebKitLoadEvent,
                                          gpointer);
@@ -61,6 +71,7 @@ webkit_decide_policy_cb (WebKitWebView *,
                          WebKitPolicyDecision *,
                          WebKitPolicyDecisionType,
                          gpointer);
+#endif
 
 
 DEFUN ("make-xwidget",
@@ -92,10 +103,11 @@ Returns the newly constructed xwidget, or nil if construction fails.  */)
   xw->kill_without_query = false;
   XSETXWIDGET (val, xw);
   Vxwidget_list = Fcons (val, Vxwidget_list);
-  xw->widgetwindow_osr = NULL;
-  xw->widget_osr = NULL;
   xw->plist = Qnil;
 
+#if defined (USE_GTK)
+  xw->widgetwindow_osr = NULL;
+  xw->widget_osr = NULL;
   if (EQ (xw->type, Qwebkit))
     {
       block_input ();
@@ -150,6 +162,9 @@ Returns the newly constructed xwidget, or nil if construction fails.  */)
 
       unblock_input ();
     }
+#elif defined (NS_IMPL_COCOA)
+  nsxwidget_init (xw);
+#endif
 
   return val;
 }
@@ -185,6 +200,7 @@ xwidget_hidden (struct xwidget_view *xv)
   return xv->hidden;
 }
 
+#if defined (USE_GTK)
 static void
 xwidget_show_view (struct xwidget_view *xv)
 {
@@ -223,8 +239,9 @@ offscreen_damage_event (GtkWidget *widget, GdkEvent *event,
 
   return FALSE;
 }
+#endif /* USE_GTK */
 
-static void
+void
 store_xwidget_event_string (struct xwidget *xw, const char *eventname,
                             const char *eventstr)
 {
@@ -238,7 +255,27 @@ store_xwidget_event_string (struct xwidget *xw, const char *eventname,
   kbd_buffer_store_event (&event);
 }
 
-static void
+void
+store_xwidget_response_callback_event (struct xwidget *xw,
+                                       const char *url,
+                                       const char *mimetype,
+                                       const char *filename)
+{
+  struct input_event event;
+  Lisp_Object xwl;
+  XSETXWIDGET (xwl, xw);
+  EVENT_INIT (event);
+  event.kind = XWIDGET_EVENT;
+  event.frame_or_window = Qnil;
+  event.arg = list5 (intern ("response-callback"),
+                     xwl,
+                     build_string (url),
+                     build_string (mimetype),
+                     build_string (filename));
+  kbd_buffer_store_event (&event);
+}
+
+void
 store_xwidget_js_callback_event (struct xwidget *xw,
                                  Lisp_Object proc,
                                  Lisp_Object argument)
@@ -254,6 +291,7 @@ store_xwidget_js_callback_event (struct xwidget *xw,
 }
 
 
+#if defined (USE_GTK)
 void
 webkit_view_load_changed_cb (WebKitWebView *webkitwebview,
                              WebKitLoadEvent load_event,
@@ -505,6 +543,7 @@ xwidget_osr_event_set_embedder (GtkWidget *widget, GdkEvent *event,
                                      gtk_widget_get_window (xv->widget));
   return FALSE;
 }
+#endif /* USE_GTK */
 
 
 /* Initializes and does initial placement of an xwidget view on screen.  */
@@ -522,6 +561,7 @@ xwidget_init_view (struct xwidget *xww,
   XSETWINDOW (xv->w, s->w);
   XSETXWIDGET (xv->model, xww);
 
+#if defined (USE_GTK)
   if (EQ (xww->type, Qwebkit))
     {
       xv->widget = gtk_drawing_area_new ();
@@ -579,6 +619,10 @@ xwidget_init_view (struct xwidget *xww,
   xv->x = x;
   xv->y = y;
   gtk_widget_show_all (xv->widgetwindow);
+#elif defined (NS_IMPL_COCOA)
+  nsxwidget_init_view (xv, xww, s, x, y);
+  nsxwidget_resize_view(xv, xww->width, xww->height);
+#endif
 
   return xv;
 }
@@ -591,24 +635,59 @@ x_draw_xwidget_glyph_string (struct glyph_string *s)
      initialization.  */
   struct xwidget *xww = s->xwidget;
   struct xwidget_view *xv = xwidget_view_lookup (xww, s->w);
+  int text_area_x, text_area_y, text_area_width, text_area_height;
   int clip_right;
   int clip_bottom;
   int clip_top;
   int clip_left;
 
   int x = s->x;
-  int y = s->y + (s->height / 2) - (xww->height / 2);
+  int y = s->y;
 
   /* Do initialization here in the display loop because there is no
      other time to know things like window placement etc.  Do not
      create a new view if we have found one that is usable.  */
+#if defined (USE_GTK)
   if (!xv)
     xv = xwidget_init_view (xww, s, x, y);
-
-  int text_area_x, text_area_y, text_area_width, text_area_height;
+#elif defined (NS_IMPL_COCOA)
+  if (!xv)
+    {
+      /* Enforce 1 to 1, model and view for macOS Cocoa webkit2.  */
+      if (xww->xv)
+        {
+          if (xwidget_hidden (xww->xv))
+            {
+              Lisp_Object xvl;
+              XSETXWIDGET_VIEW (xvl, xww->xv);
+              Fdelete_xwidget_view (xvl);
+            }
+          else
+            {
+              message ("You can't share an xwidget (webkit2) among windows.");
+              return;
+            }
+        }
+      xv = xwidget_init_view (xww, s, x, y);
+    }
+#endif
 
   window_box (s->w, TEXT_AREA, &text_area_x, &text_area_y,
               &text_area_width, &text_area_height);
+
+  /* Resize xwidget webkit if its container window size is changed in
+     some ways, for example, a buffer became hidden in small split
+     window, then it can appear front in merged whole window.  */
+  if (EQ (xww->type, Qwebkit)
+      && (xww->width != text_area_width || xww->height != text_area_height))
+    {
+      Lisp_Object xwl;
+      XSETXWIDGET (xwl, xww);
+      Fxwidget_resize (xwl,
+                       make_number (text_area_width),
+                       make_number (text_area_height));
+    }
+
   clip_left = max (0, text_area_x - x);
   clip_right = max (clip_left,
 		    min (xww->width, text_area_x + text_area_width - x));
@@ -631,8 +710,14 @@ x_draw_xwidget_glyph_string (struct glyph_string *s)
 
   /* Has it moved?  */
   if (moved)
-    gtk_fixed_move (GTK_FIXED (FRAME_GTK_WIDGET (s->f)),
-		    xv->widgetwindow, x + clip_left, y + clip_top);
+    {
+#if defined (USE_GTK)
+      gtk_fixed_move (GTK_FIXED (FRAME_GTK_WIDGET (s->f)),
+                      xv->widgetwindow, x + clip_left, y + clip_top);
+#elif defined (NS_IMPL_COCOA)
+      nsxwidget_move_view (xv, x + clip_left, y + clip_top);
+#endif
+    }
 
   /* Clip the widget window if some parts happen to be outside
      drawable area.  An Emacs window is not a gtk window.  A gtk window
@@ -643,10 +728,16 @@ x_draw_xwidget_glyph_string (struct glyph_string *s)
       || xv->clip_bottom != clip_bottom
       || xv->clip_top != clip_top || xv->clip_left != clip_left)
     {
+#if defined (USE_GTK)
       gtk_widget_set_size_request (xv->widgetwindow, clip_right - clip_left,
                                    clip_bottom - clip_top);
       gtk_fixed_move (GTK_FIXED (xv->widgetwindow), xv->widget, -clip_left,
                       -clip_top);
+#elif defined (NS_IMPL_COCOA)
+      nsxwidget_resize_view (xv, clip_right - clip_left,
+                             clip_bottom - clip_top);
+      nsxwidget_move_widget_in_view (xv, -clip_left, -clip_top);
+#endif
 
       xv->clip_right = clip_right;
       xv->clip_bottom = clip_bottom;
@@ -660,21 +751,65 @@ x_draw_xwidget_glyph_string (struct glyph_string *s)
      xwidgets background.  It's just a visual glitch though.  */
   if (!xwidget_hidden (xv))
     {
+#if defined (USE_GTK)
       gtk_widget_queue_draw (xv->widgetwindow);
       gtk_widget_queue_draw (xv->widget);
+#elif defined (NS_IMPL_COCOA)
+      nsxwidget_set_needsdisplay (xv);
+#endif
     }
 }
 
-/* Macro that checks WEBKIT_IS_WEB_VIEW (xw->widget_osr) first.  */
+static bool
+xwidget_is_web_view (struct xwidget *xw)
+{
+#if defined (USE_GTK)
+  return xw->widget_osr != NULL && WEBKIT_IS_WEB_VIEW (xw->widget_osr);
+#elif defined (NS_IMPL_COCOA)
+  return nsxwidget_is_web_view (xw);
+#endif
+}
+
+/* Macro that checks xwidget hold webkit web view first.  */
 #define WEBKIT_FN_INIT()						\
   CHECK_XWIDGET (xwidget);						\
   struct xwidget *xw = XXWIDGET (xwidget);				\
-  if (!xw->widget_osr || !WEBKIT_IS_WEB_VIEW (xw->widget_osr))		\
+  if (!xwidget_is_web_view (xw))					\
     {									\
-      printf ("ERROR xw->widget_osr does not hold a webkit instance\n"); \
+      printf ("ERROR xwidget does not hold a webkit instance\n");	\
       return Qnil;							\
     }
 
+DEFUN ("xwidget-webkit-uri",
+       Fxwidget_webkit_uri, Sxwidget_webkit_uri,
+       1, 1, 0,
+       doc: /* Get the current URL of XWIDGET webkit.  */)
+  (Lisp_Object xwidget)
+{
+  WEBKIT_FN_INIT ();
+#if defined (USE_GTK)
+  WebKitWebView *wkwv = WEBKIT_WEB_VIEW (xw->widget_osr);
+  return build_string (webkit_web_view_get_uri (wkwv));
+#elif defined (NS_IMPL_COCOA)
+  return nsxwidget_webkit_uri (xw);
+#endif
+}
+
+DEFUN ("xwidget-webkit-title",
+       Fxwidget_webkit_title, Sxwidget_webkit_title,
+       1, 1, 0,
+       doc: /* Get the current title of XWIDGET webkit.  */)
+  (Lisp_Object xwidget)
+{
+  WEBKIT_FN_INIT ();
+#if defined (USE_GTK)
+  WebKitWebView *wkwv = WEBKIT_WEB_VIEW (xw->widget_osr);
+  return build_string (webkit_web_view_get_title (wkwv));
+#elif defined (NS_IMPL_COCOA)
+  return nsxwidget_webkit_title (xw);
+#endif
+}
+
 DEFUN ("xwidget-webkit-goto-uri",
        Fxwidget_webkit_goto_uri, Sxwidget_webkit_goto_uri,
        2, 2, 0,
@@ -684,7 +819,32 @@ DEFUN ("xwidget-webkit-goto-uri",
   WEBKIT_FN_INIT ();
   CHECK_STRING (uri);
   uri = ENCODE_FILE (uri);
+#if defined (USE_GTK)
   webkit_web_view_load_uri (WEBKIT_WEB_VIEW (xw->widget_osr), SSDATA (uri));
+#elif defined (NS_IMPL_COCOA)
+  nsxwidget_webkit_goto_uri (xw, SSDATA (uri));
+#endif
+  return Qnil;
+}
+
+DEFUN ("xwidget-webkit-goto-history",
+       Fxwidget_webkit_goto_history, Sxwidget_webkit_goto_history,
+       2, 2, 0,
+       doc: /* Make the XWIDGET webkit load REL-POS (-1, 0, 1) page in browse history.  */)
+  (Lisp_Object xwidget, Lisp_Object rel_pos)
+{
+  WEBKIT_FN_INIT ();
+  CHECK_RANGED_INTEGER (rel_pos, -1, 1); /* -1, 0, 1 */
+#if defined (USE_GTK)
+  WebKitWebView *wkwv = WEBKIT_WEB_VIEW (xw->widget_osr);
+  switch (XFASTINT (rel_pos)) {
+  case -1: webkit_web_view_go_back (wkwv); break;
+  case 0: webkit_web_view_reload (wkwv); break;
+  case 1: webkit_web_view_go_forward (wkwv); break;
+  }
+#elif defined (NS_IMPL_COCOA)
+  nsxwidget_webkit_goto_history (xw, XFASTINT (rel_pos));
+#endif
   return Qnil;
 }
 
@@ -698,10 +858,14 @@ DEFUN ("xwidget-webkit-zoom",
   if (FLOATP (factor))
     {
       double zoom_change = XFLOAT_DATA (factor);
+#if defined (USE_GTK)
       webkit_web_view_set_zoom_level
         (WEBKIT_WEB_VIEW (xw->widget_osr),
          webkit_web_view_get_zoom_level
          (WEBKIT_WEB_VIEW (xw->widget_osr)) + zoom_change);
+#elif defined (NS_IMPL_COCOA)
+      nsxwidget_webkit_zoom (xw, zoom_change);
+#endif
     }
   return Qnil;
 }
@@ -738,7 +902,10 @@ argument procedure FUN.*/)
 {
   WEBKIT_FN_INIT ();
   CHECK_STRING (script);
-  if (!NILP (fun) && !FUNCTIONP (fun))
+  /* FUN will not be garbage collected if it is defined with `defun'
+     instead of `lambda'.  If it is garbage collected even though it
+     is `defun', we can counter by pinning the FUN's symbol.  */
+  if (!NILP (fun) && !SYMBOLP (fun) && !NILP (Ffboundp (fun)))
     wrong_type_argument (Qinvalid_function, fun);
 
   script = ENCODE_SYSTEM (script);
@@ -746,6 +913,7 @@ argument procedure FUN.*/)
   /* Protect script and fun during GC.  */
   intptr_t idx = save_script_callback (xw, script, fun);
 
+#if defined (USE_GTK)
   /* JavaScript execution happens asynchronously.  If an elisp
      callback function is provided we pass it to the C callback
      procedure that retrieves the return value.  */
@@ -756,6 +924,9 @@ argument procedure FUN.*/)
                                   NULL, /* cancelable */
                                   webkit_javascript_finished_cb,
 				  (gpointer) idx);
+#elif defined (NS_IMPL_COCOA)
+  nsxwidget_webkit_execute_script (xw, SSDATA (script), fun);
+#endif
   return Qnil;
 }
 
@@ -774,6 +945,7 @@ DEFUN ("xwidget-resize", Fxwidget_resize, Sxwidget_resize, 3, 3, 0,
   xw->height = h;
 
   /* If there is an offscreen widget resize it first.  */
+#if defined (USE_GTK)
   if (xw->widget_osr)
     {
       gtk_window_resize (GTK_WINDOW (xw->widgetwindow_osr), xw->width,
@@ -782,6 +954,9 @@ DEFUN ("xwidget-resize", Fxwidget_resize, Sxwidget_resize, 3, 3, 0,
       gtk_widget_set_size_request (GTK_WIDGET (xw->widget_osr), xw->width,
                                    xw->height);
     }
+#elif defined (NS_IMPL_COCOA)
+  nsxwidget_resize (xw);
+#endif
 
   for (Lisp_Object tail = Vxwidget_view_list; CONSP (tail); tail = XCDR (tail))
     {
@@ -789,8 +964,14 @@ DEFUN ("xwidget-resize", Fxwidget_resize, Sxwidget_resize, 3, 3, 0,
         {
           struct xwidget_view *xv = XXWIDGET_VIEW (XCAR (tail));
           if (XXWIDGET (xv->model) == xw)
+            {
+#if defined (USE_GTK)
               gtk_widget_set_size_request (GTK_WIDGET (xv->widget), xw->width,
                                            xw->height);
+#elif defined (NS_IMPL_COCOA)
+              nsxwidget_resize_view(xv, xw->width, xw->height);
+#endif
+            }
         }
     }
 
@@ -809,10 +990,14 @@ Emacs allocated area accordingly.  */)
   (Lisp_Object xwidget)
 {
   CHECK_XWIDGET (xwidget);
+#if defined (USE_GTK)
   GtkRequisition requisition;
   gtk_widget_size_request (XXWIDGET (xwidget)->widget_osr, &requisition);
   return list2 (make_number (requisition.width),
 		make_number (requisition.height));
+#elif defined (NS_IMPL_COCOA)
+  return nsxwidget_get_size(XXWIDGET (xwidget));
+#endif
 }
 
 DEFUN ("xwidgetp",
@@ -889,14 +1074,19 @@ DEFUN ("delete-xwidget-view",
 {
   CHECK_XWIDGET_VIEW (xwidget_view);
   struct xwidget_view *xv = XXWIDGET_VIEW (xwidget_view);
-  gtk_widget_destroy (xv->widgetwindow);
   Vxwidget_view_list = Fdelq (xwidget_view, Vxwidget_view_list);
+#if defined (USE_GTK)
+  gtk_widget_destroy (xv->widgetwindow);
   /* xv->model still has signals pointing to the view.  There can be
      several views.  Find the matching signals and delete them all.  */
   g_signal_handlers_disconnect_matched  (XXWIDGET (xv->model)->widgetwindow_osr,
                                          G_SIGNAL_MATCH_DATA,
                                          0, 0, 0, 0,
                                          xv->widget);
+#elif defined (NS_IMPL_COCOA)
+  nsxwidget_delete_view (xv);
+#endif
+
   return Qnil;
 }
 
@@ -1002,7 +1192,10 @@ syms_of_xwidget (void)
   defsubr (&Sxwidget_query_on_exit_flag);
   defsubr (&Sset_xwidget_query_on_exit_flag);
 
+  defsubr (&Sxwidget_webkit_uri);
+  defsubr (&Sxwidget_webkit_title);
   defsubr (&Sxwidget_webkit_goto_uri);
+  defsubr (&Sxwidget_webkit_goto_history);
   defsubr (&Sxwidget_webkit_zoom);
   defsubr (&Sxwidget_webkit_execute_script);
   DEFSYM (Qwebkit, "webkit");
@@ -1175,11 +1368,19 @@ xwidget_end_redisplay (struct window *w, struct glyph_matrix *matrix)
 		     xwidget_end_redisplay (w->current_matrix);  */
 		  struct xwidget_view *xv
 		    = xwidget_view_lookup (glyph->u.xwidget, w);
+#if defined (USE_GTK)
 		  /* FIXME: Is it safe to assume xwidget_view_lookup
 		     always succeeds here?  If so, this comment can be removed.
 		     If not, the code probably needs fixing.  */
 		  eassume (xv);
 		  xwidget_touch (xv);
+#elif defined (NS_IMPL_COCOA)
+                  /* In NS xwidget, xv can be NULL for the second or
+                     later views for a model, the result of 1 to 1
+                     model view relation enforcement.  */
+                  if (xv)
+                    xwidget_touch (xv);
+#endif
 		}
 	  }
     }
@@ -1196,9 +1397,21 @@ xwidget_end_redisplay (struct window *w, struct glyph_matrix *matrix)
           if (XWINDOW (xv->w) == w)
             {
               if (xwidget_touched (xv))
-                xwidget_show_view (xv);
+                {
+#if defined (USE_GTK)
+                  xwidget_show_view (xv);
+#elif defined (NS_IMPL_COCOA)
+                  nsxwidget_show_view (xv);
+#endif
+                }
               else
-                xwidget_hide_view (xv);
+                {
+#if defined (USE_GTK)
+                  xwidget_hide_view (xv);
+#elif defined (NS_IMPL_COCOA)
+                  nsxwidget_hide_view (xv);
+#endif
+                }
             }
         }
     }
@@ -1217,6 +1430,7 @@ kill_buffer_xwidgets (Lisp_Object buffer)
       {
         CHECK_XWIDGET (xwidget);
         struct xwidget *xw = XXWIDGET (xwidget);
+#if defined (USE_GTK)
         if (xw->widget_osr && xw->widgetwindow_osr)
           {
             gtk_widget_destroy (xw->widget_osr);
@@ -1230,6 +1444,9 @@ kill_buffer_xwidgets (Lisp_Object buffer)
 		xfree (XSAVE_POINTER (XCAR (cb), 0));
 	      ASET (xw->script_callbacks, idx, Qnil);
 	    }
+#elif defined (NS_IMPL_COCOA)
+        nsxwidget_kill (xw);
+#endif
       }
     }
 }
diff --git a/src/xwidget.h b/src/xwidget.h
index 89fc7ff458..c97bdfcf75 100644
--- a/src/xwidget.h
+++ b/src/xwidget.h
@@ -29,7 +29,13 @@ struct xwidget_view;
 struct window;
 
 #ifdef HAVE_XWIDGETS
-# include <gtk/gtk.h>
+
+#if defined (USE_GTK)
+#include <gtk/gtk.h>
+#elif defined (NS_IMPL_COCOA) && defined (__OBJC__)
+#import <AppKit/NSView.h>
+#import "nsxwidget.h"
+#endif
 
 struct xwidget
 {
@@ -55,9 +61,25 @@ struct xwidget
   int height;
   int width;
 
+#if defined (USE_GTK)
   /* For offscreen widgets, unused if not osr.  */
   GtkWidget *widget_osr;
   GtkWidget *widgetwindow_osr;
+#elif defined (NS_IMPL_COCOA)
+# ifdef __OBJC__
+  /* For offscreen widgets, unused if not osr.  */
+  NSView *xwWidget;
+  XwWindow *xwWindow;
+
+  /* Used only for xwidget types (such as webkit2) enforcing 1 to 1
+     relationship between model and view.  */
+  struct xwidget_view *xv;
+# else
+  void *xwWidget;
+  void *xwWindow;
+  struct xwidget_view *xv;
+# endif
+#endif
 
   /* Kill silently if Emacs is exited.  */
   bool_bf kill_without_query : 1;
@@ -77,9 +99,20 @@ struct xwidget_view
   /* The "live" instance isn't drawn.  */
   bool hidden;
 
+#if defined (USE_GTK)
   GtkWidget *widget;
   GtkWidget *widgetwindow;
   GtkWidget *emacswindow;
+#elif defined (NS_IMPL_COCOA)
+# ifdef __OBJC__
+  XvWindow *xvWindow;
+  NSView *emacswindow;
+# else
+  void *xvWindow;
+  void *emacswindow;
+# endif
+#endif
+
   int x;
   int y;
   int clip_right;
-- 
2.17.0