New upstream version 0.5.3+git20210102upstream/0.5.3+git20210102upstream

10 files changed, 271 insertions, 173 deletions

diff --git a/doc/README b/doc/README
index 324ea3e..0dc1901 100644
--- a/doc/README
+++ b/doc/README
@@ -110,12 +110,5 @@ Initial author:
 	Faculty of Engineering, Tohoku University
 	aito@fw.ipsj.or.jp
 
-Current Maintainer
-	Dai Sato
-	Tohoku University Hospital
-	satodai@w3m.jp
-
-Feel free to send your opinion to the w3m mailing-lists.
-	w3m-dev@sic.med.tohoku.ac.jp (Japanese)
-	w3m-dev-en@sic.med.tohoku.ac.jp (English)
-	http://w3m.sourceforge.net/
+This package is maintained for Debian <https://www.debian.org>,
+forked from the original version <https://sourceforge.net/projects/w3m/>.
diff --git a/doc/README.cookie b/doc/README.cookie
index 56cca50..71523e0 100644
--- a/doc/README.cookie
+++ b/doc/README.cookie
@@ -9,21 +9,21 @@ cookie support of w3m
    http://www.ics.uci.edu/pub/ietf/http/draft-ietf-http-state-man-mec-12.txt)
    cookie.
    
- * If you wont to disable cookie support, run configure script with
+ * If you want to disable cookie support, run the configure script with
     --disable-cookie option.
    
- * You can choose to use cookie or not on the Option Setting Panel or
+ * You can choose to use cookies or not on the Option Setting Panel or
    -cookie and -no-cookie option.
    
- * You can disable cookie on the Option Setting Panel. In this case
-    all cookies are rejected, however, cookies which accepted before
-    disable cookie are used.
+ * You can disable cookies on the Option Setting Panel. In this case
+    all new cookies are rejected, however, cookies which were accepted before
+    cookies were disabled are used.
    
- * You can see list of accepted cookies with C-k. In this panel, you
+ * You can see the list of accepted cookies with C-k. In this panel, you
     can choose to use each cookie or not.
    
- * You can specify domains accept or not accept cookies on the Option
-    Setting Panel. Domains are specified with following format.
+ * You can specify domains from which to accept or not accept cookies
+    on the Option Setting Panel. Domains are specified in the following format:
    
       domain-list = domains
                   | ""
@@ -37,7 +37,7 @@ cookie support of w3m
                               (HDN: host domain name)
 
 
- ¡¦ If the number of "." in domain name is lesser than 2, it is
+ * If the number of "." in domain name is fewer than 2, it is
     assumed as invalid cookie (cf. RFC 2109 4.3.2), however, you can
     use cookie_avoid_wrong_number_of_dots to avoid this
     restriction. You can set this in "Domains to avoid [wrong number
diff --git a/doc/README.dict b/doc/README.dict
index bd82cdb..88f4b1a 100644
--- a/doc/README.dict
+++ b/doc/README.dict
@@ -2,14 +2,14 @@ Dictionary look-up hack for w3m
 
 1. INTRODUCTION
 
-If you have dictionary look-up command (like 'webster'), you can
-look a word in a document using w3m. This dictionary-lookup code
+If you have a dictionary look-up command (such as 'webster'), you can
+look up words in a document using w3m. This dictionary-lookup code
 was contributed by `Rubikitch' (rubikitch@ruby-lang.org), and
-further modifed by Tushar Samant (scribble at pobox.com).
+further modified by Tushar Samant (scribble at pobox.com).
 
 2. INSTALLATION
 
-To make use of dictionary look-up, you currently must change a
+To make use of the dictionary look-up, you currently must change a
 compile option by hand. After running configure, edit config.h
 and change
 
@@ -19,7 +19,7 @@ to
 
 #define USE_DICT
 
-and recompile w3me (i.e. type "make install").
+and recompile w3m (i.e. type "make install").
 Note that w3m/0.3+cvs-1.373 or later, USE_DICT is defined by default.
 
 Then find or install a CGI program which takes a word as a query
diff --git a/doc/README.func b/doc/README.func
index 0b2c034..3bdec74 100644
--- a/doc/README.func
+++ b/doc/README.func
@@ -1,145 +1,150 @@
-ABORT		Quit w3m without confirmation
-ACCESSSKEY	Popup acceskey menu
-ADD_BOOKMARK	Add current page to bookmark
+ABORT		Quit at once
+ACCESSKEY	Pop up accesskey menu
+ADD_BOOKMARK	Add current page to bookmarks
 ALARM		Set alarm
-BACK		Back to previous buffer
+BACK		Close current buffer and return to the one below in stack
 BEGIN		Go to the first line
-BOOKMARK	Read bookmark
-CENTER_H	Move to the center line
-CENTER_V	Move to the center column
-CHARSET		Change the current document charset
-CLOSE_TAB	Close current tab
-CLOSE_TAB_MOUSE	Close tab on mouse cursor (for mouse action)
-COMMAND		Execute w3m command(s)
+BOOKMARK	View bookmarks
+CENTER_H	Center on cursor column
+CENTER_V	Center on cursor line
+CHARSET 	Change the character encoding for the current document
+CLOSE_TAB	Close tab
+CLOSE_TAB_MOUSE Close tab at mouse pointer
+COMMAND 	Invoke w3m function(s)
 COOKIE		View cookie list
-DEFAULT_CHARSET	Change the default document charset
-DEFINE_KEY	Define a binding between a key stroke and a user command
-DELETE_PREVBUF  Delete previous buffer (mainly for local-CGI)
+CURSOR_TOP	Move cursor to the top line on the screen
+CURSOR_MIDDLE	Move cursor to the middle line on the screen
+CURSOR_BOTTOM	Move cursor to the bottom line on the screen
+DEFAULT_CHARSET Change the default character encoding
+DEFINE_KEY	Define a binding between a key stroke combination and a command
+DELETE_PREVBUF	Delete previous buffer (mainly for local CGI-scripts)
 DICT_WORD	Execute dictionary command (see README.dict)
-DICT_WORD_AT   Execute dictionary command for word at cursor
+DICT_WORD_AT	Execute dictionary command for word at cursor
 DISPLAY_IMAGE	Restart loading and drawing of images
-DOWN		Scroll down one line
-DOWNLOAD	Save document source to file
-DOWNLOAD_LIST	Display download list panel
-EDIT		Edit current document
-EDIT_SCREEN	Edit currently rendered document
+DOWN		Scroll the screen down one line
+DOWNLOAD	Save document source
+DOWNLOAD_LIST	Display downloads panel
+EDIT		Edit local source
+EDIT_SCREEN	Edit rendered copy of document
 END		Go to the last line
-EXEC_SHELL	Execute shell command
-EXIT		Quit w3m without confirmation
-EXTERN		Execute external browser
-EXTERN_LINK	View current link using external browser
-FRAME		Render frame
-GOTO		Go to URL
-GOTO_LINE	Go to specified line
-GOTO_LINK	Go to current link
-GOTO_RELATIVE	Go to relative URL
-HELP		View help
-HISTORY		View history of URL
-INFO		View info of current document
-INTERRUPT	Stop loading document
-INIT_MAILCAP    Reread mailcap (mainly for local-CGI)
-ISEARCH		Incremental search forward
+EXEC_SHELL	Execute shell command and display output
+EXIT		Quit at once
+EXTERN		Display using an external browser
+EXTERN_LINK	Display target using an external browser
+FRAME		Toggle rendering HTML frames
+GOTO		Open specified document in a new buffer
+GOTO_HOME	Return to the homepage (specified HTTP_HOME or WWW_HOME variable)
+GOTO_LINE	Go to the specified line
+GOTO_LINK	Follow current hyperlink in a new buffer
+GOTO_RELATIVE	Go to relative address
+HELP		Show help panel
+HISTORY 	Show browsing history
+INFO		Display information about the current document
+INTERRUPT	Suspend w3m to background
+ISEARCH 	Incremental search forward
 ISEARCH_BACK	Incremental search backward
-LEFT		Shift screen one column
-LINE_BEGIN	Go to the beginning of line
-LINE_END	Go to the end of line
-LINE_INFO	Show current line number
-LINK_BEGIN     Go to the first link
-LINK_END       Go to the last link
-LINK_MENU	Popup link element menu
-LIST		Show all links and images
-LIST_MENU	Popup link list menu and go to selected link
-LOAD		Load local file
-MAIN_MENU	Popup menu
+LEFT		Shift screen one column left
+LINE_BEGIN	Go to the beginning of the line
+LINE_END	Go to the end of the line
+LINE_INFO	Display current position in document
+LINK_BEGIN	Move to the first hyperlink
+LINK_END	Move to the last hyperlink
+LINK_MENU	Pop up link element menu
+LIST		Show all URLs referenced
+LIST_MENU	Pop up menu for hyperlinks to browse to
+LOAD		Open local file in a new buffer
+MAIN_MENU	Pop up menu
 MARK		Set/unset mark
-MARK_MID	Mark Message-ID-like strings as anchors
-MARK_URL	Mark URL-like strings as anchors
-MARK_WORD	Mark current word as anchor
-MENU		Popup menu
-MENU_MOUSE	Popup menu at mouse cursor (for mouse action)
-MOUSE_TOGGLE   Toggle activity of mouse
-MOVE_DOWN      Move cursor down (a half screen scroll at the end of screen)
-MOVE_DOWN1     Move cursor down (1 line scroll at the end of screen)
-MOVE_LEFT      Move cursor left (a half screen shift at the left edge)
-MOVE_LEFT1     Move cursor left (1 columns shift at the left edge)
-MOVE_LIST_MENU	Popup link list menu and move cursor to selected link
-MOVE_MOUSE	Move cursor to mouse cursor (for mouse action)
-MOVE_RIGHT     Move cursor right (a half screen shift at the right edge)
-MOVE_RIGHT1    Move cursor right (1 columns shift at the right edge)
-MOVE_UP                Move cursor up (a half screen scroll at the top of screen)
-MOVE_UP1       Move cursor up (1 line scrol at the top of screen)
-MSGS        Display error messages
-NEW_TAB		Open new tab
-NEXT		Move to next buffer
-NEXT_DOWN      Move to next downward link 
-NEXT_LEFT      Move to next left link 
-NEXT_LEFT_UP   Move to next left (or upward) link 
-NEXT_LINK	Move to next link
-NEXT_MARK	Move to next word
-NEXT_PAGE	Move to next page
-NEXT_RIGHT     Move to next right link 
-NEXT_RIGHT_DOWN        Move to next right (or downward) link 
-NEXT_TAB	Move to next tab
-NEXT_UP                Move to next upward link 
-NEXT_VISITED    Move to next visited link
-NEXT_WORD	Move to next word
-NOTHING		Do nothing
+MARK_MID	Turn Message-ID-like strings into hyperlinks
+MARK_URL	Turn URL-like strings into hyperlinks
+MARK_WORD	Turn current word into hyperlink
+MENU		Pop up menu
+MENU_MOUSE	Pop up menu at mouse pointer
+MOUSE_TOGGLE	Toggle mouse support
+MOVE_DOWN	Cursor down
+MOVE_DOWN1	Cursor down. With edge touched, slide
+MOVE_LEFT	Cursor left
+MOVE_LEFT1	Cursor left. With edge touched, slide
+MOVE_LIST_MENU	Pop up menu to navigate between hyperlinks
+MOVE_MOUSE	Move cursor to mouse pointer
+MOVE_RIGHT	Cursor right
+MOVE_RIGHT1	Cursor right. With edge touched, slide
+MOVE_UP		Cursor up
+MOVE_UP1	Cursor up. With edge touched, slide
+MSGS		Display error messages
+NEW_TAB 	Open a new tab (with current document)
+NEXT		Switch to the next buffer
+NEXT_DOWN	Move downward to the next hyperlink
+NEXT_HALF_PAGE	Scroll down half a page
+NEXT_LEFT	Move left to the next hyperlink
+NEXT_LEFT_UP	Move left or upward to the next hyperlink
+NEXT_LINK	Move to the next hyperlink
+NEXT_MARK	Go to the next mark
+NEXT_PAGE	Scroll down one page
+NEXT_RIGHT	Move right to the next hyperlink
+NEXT_RIGHT_DOWN	Move right or downward to the next hyperlink
+NEXT_TAB	Switch to the next tab
+NEXT_UP		Move upward to the next hyperlink
+NEXT_VISITED	Move to the next visited hyperlink
+NEXT_WORD	Move to the next word
+NOTHING 	Do nothing
 NULL		Do nothing
-OPTIONS		Option setting panel
-PEEK		Peek current URL
-PEEK_IMG	Peek image URL 
-PEEK_LINK      Peek link URL
-PIPE_BUF       Send rendered document to pipe
-PIPE_SHELL	Execute shell command and browse
-PREV		Move to previous buffer
-PREV_LINK	Move to previous link
-PREV_MARK	Move to previous mark
-PREV_PAGE	Move to previous page
-PREV_TAB	Move to previous tab
-PREV_VISITED    Move to previous visited link
-PREV_WORD	Move to previous word
-PRINT		Save buffer to file
-QUIT		Quit w3m
-READ_SHELL	Execute shell command and load
+OPTIONS 	Display options setting panel
+PEEK		Show current address
+PEEK_IMG	Show image address
+PEEK_LINK	Show target address
+PIPE_BUF	Pipe current buffer through a shell command and display output
+PIPE_SHELL	Execute shell command and display output
+PREV		Switch to the previous buffer
+PREV_HALF_PAGE	Scroll up half a page
+PREV_LINK	Move to the previous hyperlink
+PREV_MARK	Go to the previous mark
+PREV_PAGE	Scroll up one page
+PREV_TAB	Switch to the previous tab
+PREV_VISITED	Move to the previous visited hyperlink
+PREV_WORD	Move to the previous word
+PRINT		Save rendered document
+QUIT		Quit with confirmation request
+READ_SHELL	Execute shell command and display output
 REDO		Cancel the last undo
-REDRAW		Redraw screen
-REG_MARK	Set mark using regexp
-REINIT		Reload configuration files
-RELOAD		Reload buffer
-RESHAPE		Re-render buffer
+REDRAW		Draw the screen anew
+REG_MARK	Mark all occurences of a pattern
+REINIT		Reload configuration file
+RELOAD		Load current document anew
+RESHAPE 	Re-render document
 RIGHT		Shift screen one column right
-SAVE		Save document source to file
-SAVE_IMAGE	Save image to file
-SAVE_LINK	Save link to file
-SAVE_SCREEN	Save rendered document to file
+SAVE		Save document source
+SAVE_IMAGE	Save inline image
+SAVE_LINK	Save hyperlink target
+SAVE_SCREEN	Save rendered document
 SEARCH		Search forward
 SEARCH_BACK	Search backward
 SEARCH_FORE	Search forward
-SEARCH_NEXT	Search next regexp
-SEARCH_PREV	Search previous regexp
-SELECT		Go to buffer selection panel
-SELECT_MENU    Popup buffer selection menu
-SETENV        Set environment variable
-SET_OPTION     Set option
-SHELL		Execute shell command
+SEARCH_NEXT	Continue search forward
+SEARCH_PREV	Continue search backward
+SELECT		Display buffer-stack panel
+SELECT_MENU	Pop up buffer-stack menu
+SETENV		Set environment variable
+SET_OPTION	Set option
+SHELL		Execute shell command and display output
 SHIFT_LEFT	Shift screen left
 SHIFT_RIGHT	Shift screen right
-SOURCE		View HTML source
+SOURCE		Toggle between HTML shown or processed
 STOP_IMAGE	Stop loading and drawing of images
 SUBMIT		Submit form
-SUSPEND		Stop loading document
-TAB_GOTO	Open URL on new tab
-TAB_GOTO_RELATIVE	Open relative URL on new tab
-TAB_LEFT	Move current tab left
-TAB_LINK	Open current link on new tab
-TAB_MENU	Popup tab selection menu
-TAB_MOUSE	Move to tab on mouse cursor (for mouse action)
-TAB_RIGHT	Move current tab right
+SUSPEND 	Suspend w3m to background
+TAB_GOTO	Open specified document in a new tab
+TAB_GOTO_RELATIVE	Open relative address in a new tab
+TAB_LEFT	Move left along the tab bar
+TAB_LINK	Follow current hyperlink in a new tab
+TAB_MENU	Pop up tab selection menu
+TAB_MOUSE	Select tab by mouse action
+TAB_RIGHT	Move right along the tab bar
 UNDO		Cancel the last cursor movement
-UP		Scroll up one line
-VERSION                Display version of w3m
-VIEW		View HTML source
-VIEW_BOOKMARK	View bookmark
-VIEW_IMAGE	View image
-WHEREIS		Search forward
-WRAP_TOGGLE    Toggle wrap search mode
+UP		Scroll the screen up one line
+VERSION		Display the version of w3m
+VIEW		Toggle between HTML shown or processed
+VIEW_BOOKMARK	View bookmarks
+VIEW_IMAGE	Display image in viewer
+WHEREIS 	Search forward
+WRAP_TOGGLE	Toggle wrapping mode in searches
diff --git a/doc/README.img b/doc/README.img
index 0c10114..af6d9db 100644
--- a/doc/README.img
+++ b/doc/README.img
@@ -11,8 +11,8 @@ Introduction
 
 Support
 
-  * Display inline image (GIF,PNG,JPEG, etc.) on terminals
-    (xterm,rxvt, etc.) of X11, Linux framebuffer device or
+  * Display inline images (GIF, PNG, JPEG, etc.) on terminals
+    (xterm, rxvt, etc.) of X11, Linux framebuffer device or
     terminals of Windows.
   * Support inline image of <img> tag.
     Support of attributes "width", "height", and "align".
@@ -41,7 +41,7 @@ Key functions
   Specify the following keymaps in ~/.w3m/keymap.
       keymap  X    DISPLAY_IMAGE
       keymap  C-c  STOP_IMAGE
-      keyamp  t    SET_OPTION  display_image=toggle
+      keymap  t    SET_OPTION  display_image=toggle
 
 Commandline options
 
@@ -66,7 +66,7 @@ Option panel
       Automatic loading of inline image. The default is ON.
       If it is OFF, loading starts with a command DISPLAY_IMAGE.
   max_load_image
-      Maximum process for downloading of inline image. The default is 4.
+      Maximum # of processes for downloading inline images. The default is 4.
       1 to 8 can be set.
   ext_image_viewer
       Use external image viewer, when a command VIEW_IMAGE or
@@ -75,8 +75,8 @@ Option panel
   image_scale
       Scale of image (%). The default value is 100(%).
   imgdisplay
-      External command to display image". The default value is "w3mimgdisplay".
-      See "Setting w3mimgdisplay".
+      External command to display image. The default value is "w3mimgdisplay".
+      See "Setting w3mimgdisplay."
 
 Required programs
 
@@ -124,8 +124,8 @@ Setting w3mimgdisplay
       The default value for Linux framebuffer device is #000000 (black).
       When the color is specified as #RRGGBB, escape '#'.
   -anim <n>
-      Maximum number of frames for animation. It means without limit
-      if the number is 0. Negative value count backward from the end
+      Maximum number of frames for animation. It will run everything
+      if the number is 0. Negative values count backward from the end
       of the frames. The default value is 100.
   -margin <n>
       Margin of an area to clear an image. The default value is 0.
@@ -135,13 +135,13 @@ Setting w3mimgdisplay
 
 Notice
     If you want to see GIF animation, please hit a suitable key, such
-    as 'h', 'l', etc., repeatedly, because a frame is rewritten
+    as 'h', 'l', etc., repeatedly, because a new frame is only requested
     according to the re-drawing demand from w3m.
 
     Some code in w3mimg/fb/fb.c was originally written by Mr. Yamasaki.
     http://www.sainet.or.jp/~yamasaki/download/fb-sample.tar.gz
 
-    On Windows, we check the behaver on standard console, Cygwin rxvt
+    On Windows, we check the behavior on standard console, Cygwin rxvt
     and PuTTY.
 
 
diff --git a/doc/README.m17n b/doc/README.m17n
index c064d76..da5408b 100644
--- a/doc/README.m17n
+++ b/doc/README.m17n
@@ -49,7 +49,7 @@ Supported encoding schemes (character set)
   * Thai
       TIS-620 (ISO-8859-11), CP874
   * Other
-      US_ASCII, ISO-8859-1 ¡Á 10, 13 ¡Á 15,
+      US_ASCII, ISO-8859-1 - 10, 13 - 15,
       KOI8-R, KOI8-U, NeXT, CP437, CP737, CP775, CP850, CP852, CP855, CP856,
       CP857, CP860, CP861, CP862, CP863, CP864, CP865, CP866, CP869, CP1006,
       CP1250, CP1251, CP1252, CP1253, CP1254, CP1255, CP1256, CP1257
diff --git a/doc/README.pre_form b/doc/README.pre_form
index 972ef90..dad62f8 100644
--- a/doc/README.pre_form
+++ b/doc/README.pre_form
@@ -1,12 +1,12 @@
-pre_form: Feature to configure form parameters when opening specific site.
+pre_form: Feature to pre-fill form parameters when opening a specific site.
 
-It would be convinient for sites where you often visit, but it may introduce
-some security issues.  Be careful to use this feature, especially `submit'
+It is convenient for sites that you visit often, but it may introduce
+some security issues.  Be careful when using this feature, especially `submit'
 params described below.
 
 Default configuration file for pre_form is ~/.w3m/pre_form.
 
-Syntax as follows:
+The syntax of entries in the configuration file is as follows:
 
 url       <url>|/<re-url>/
 form      [<name>] <action>
@@ -23,21 +23,21 @@ textarea  <name>
    :
 /textarea
 
-If <action> is set, form which has matched <action> attributes
+If <action> is set, a form which has matched <action> attributes
 will be configured by this pre_form.
 
-The line begining with text, file, passwd, select, textarea means that
+A line beginning with text, file, passwd, select, textarea means that
 it will set value to <value> in input, select or textarea element which 
 name  attribute matches with <name>.
 
-The line beginning with checkbox, radio means that it will check
+A line beginning with checkbox, radio means that it will check
 input element which name and value attribute matches with <name> and <value>
-respectively.  If <checked> is 0, no, or off, disable check of the checkbox.
+respectively.  If <checked> is 0, no, or off, the checkbox will be unchecked.
 
-The line beginning with submit or image means that it will submit input
-element which name attribute matches with <name> (and value attribute
-matches with <value>), or submit last <input type=submit> element if no
-<name> specified.
+A line beginning with submit or image means that it will submit input
+element whose name attribute matches with <name> (and value attribute
+matches with <value>), or submit on the last <input type=submit> element if no
+<name> was specified.
 
 You quote \, ' (single-quote) or " (double quote) as you do in shell.
 
diff --git a/doc/README.siteconf b/doc/README.siteconf
new file mode 100644
index 0000000..8514edf
--- /dev/null
+++ b/doc/README.siteconf
@@ -0,0 +1,73 @@
+The siteconf: Site-specific preferences 
+
+The siteconf consists of URL patterns and preferences associated to them.
+You can improve "decode_url" feature by giving charsets of URLs site by site,
+or bypass Google's redirector for performance and your privacy.
+
+The siteconf is read from ~/.w3m/siteconf by default.
+
+===== The syntax =====
+
+url <url>|/<re-url>/|m@<re-url>@i [exact]
+substitute_url "<destination-url>"
+url_charset <charset>
+no_referer_from on|off
+no_referer_to on|off
+user_agent "string"
+
+The last match wins.
+
+===== Examples =====
+
+url m!^https?://([a-z]+\.)?twitter\.com/!
+substitute_url "https://nitter.net/"
+
+This forwards twitter.com to the alternative site.
+
+url "http://your.bookmark.net/"
+no_referer_from on
+
+This prevents HTTP referers from being sent when you follow links
+at the your.bookmark.net.
+
+url "http://www.google.com/url?" exact
+substitute_url "file:///cgi-bin/your-redirector.cgi?"
+
+This forwards the Google's redirector to your local CGI.
+
+url /^http:\/\/[a-z]*\.wikipedia\.org\//
+url_charset utf-8
+
+When combinated with "decode_url" option turned on, links to
+Wikipedia will be human-readable.
+
+url m@^https?://(.*\.)google\.com/@
+user_agent "Lynx/2.8.8dev.3 libwww-FM/2.14 SSL-MM/1.4.1"
+
+Tell Google we're actually Lynx. (So they send us a text-browser friendly
+results page.)
+
+url m!^https?://([a-z]+\.)?twitter\.com/!
+user_agent "Googlebot/2.1"
+
+Tell Twitter we're actually Googlebot. (So they send us a page without
+rejection of a JavaScript disabled browser.)
+
+===== Regular expressions notes =====
+
+Following expressions are all equivalent:
+
+/http:\/\/www\.example\.com\//
+m/http:\/\/www\.example\.com\//
+m@http://www\.example\.com/@
+m!http://www\.example\.com/!
+
+With a trailing 'i' modifier, you can specify a case-insensitive match.
+For example, m@^http://www\.example\.com/abc/@i matches to:
+
+http://www.example.com/abc/
+http://www.example.com/Abc/
+http://www.example.com/ABC/
+
+Hostnames, however, are always converted to lowercases before compared.
+
diff --git a/doc/README.sixel b/doc/README.sixel
new file mode 100644
index 0000000..588afc4
--- /dev/null
+++ b/doc/README.sixel
@@ -0,0 +1,27 @@
+Sixel support of w3m
+                                                              2014/11/05
+                                                              K. Araki
+
+Introduction
+
+  This is the extension for w3m to show inline images by sixel graphics.
+
+Requirements
+
+  Install 'img2sixel' command provided by libsixel project.
+  (https://github.com/saitoha/libsixel)
+
+Build
+
+  $ ./configure --enable-image ...
+  $ make
+  $ make install
+
+Usage
+
+  $ w3m -sixel http://...
+
+  You can specify options of 'img2sixel' command by "W3M_IMG2SIXEL"
+  environmental variable.
+
+  $ W3M_IMG2SIXEL="img2sixel -d atkinson" w3m -sixel http://...
diff --git a/doc/README.tab b/doc/README.tab
index 8e98e1c..f237f70 100644
--- a/doc/README.tab
+++ b/doc/README.tab
@@ -39,7 +39,7 @@ Options:
   open_tab_blank ...	open new tab if target is _blank or _new
 			default: OFF
   close_tab_back ...	close the tab when you back from last buffer in the tab
-			default: OFF (= Can't back...)
+			default: OFF (= Can't go back...)