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+--------------------------------------------------------------------------------
+ Common NetSurf user options 4nd December 2014
+--------------------------------------------------------------------------------
+
+ This document outlines the common configuration options supported by the
+ NetSurf core.
+
+Overview
+========
+
+ The users configurations are generally stored in a "Choices" file
+ and are loaded at browser startup. Most user interfaces provide a
+ way to configure these parameters in a manner consistant with the
+ toolkit in use.
+
+ The user choices are stored as a simple key:value list.
+
+ Each entry has a type, one of: boolean, integer, unsigned integer,
+ hexadecimal colour value or string.
+
+General Options
+===============
+
++----------------------+--------+-----------+----------------------------------+
+| Option Key | Type | Default | Description |
++----------------------+--------+-----------+----------------------------------+
+| http_proxy | bool | false | An HTTP proxy should be used. |
+| | | | |
+| http_proxy | bool | false | An HTTP proxy should be used. |
+| | | | |
+| http_proxy_host | string | NULL | Hostname of proxy. |
+| | | | |
+| http_proxy_port | int | 8080 | Proxy port. |
+| | | | |
+| http_proxy_auth | int | 0 | Proxy authentication method. |
+| | | | |
+| http_proxy_auth_user | string | NULL | Proxy authentication user name |
+| | | | |
+| http_proxy_auth_pass | string | NULL | Proxy authentication password |
+| | | | |
+| http_proxy_noproxy | string | localhost | Proxy omission list |
+| | | | |
+| font_size | int | 128 | Default font size / 0.1pt. |
+| | | | |
+| font_min_size | int | 85 | Minimum font size. |
+| | | | |
+| font_sans | string | NULL | Default sans serif font |
+| | | | |
+| font_serif | string | NULL | Default serif font |
+| | | | |
+| font_mono | string | NULL | Default monospace font
+| | | | |
+| font_cursive | string | NULL | Default cursive font
+| | | | |
+| font_fantasy | string | NULL | Default fantasy font
+| | | | |
+| accept_language | string | NULL | Accept-Language header.
+| | | | |
+| accept_charset | string | NULL | Accept-Charset header.
+| | | | |
+| memory_cache_size | int | 12MiB | Preferred maximum size of memory |
+| | | | cache in bytes. |
+| | | | |
+| disc_cache_size | uint | 1GiB | Preferred expiry size of disc |
+| | | | cache in bytes. |
+| | | | |
+| disc_cache_age | int | 28 | Preferred expiry age of disc |
+| | | | cache in days. |
+| | | | |
+| block_advertisements | bool | false | Whether to block advertisements
+| | | | |
+| do_not_track | bool | false | Disable website tracking [1]
+| | | | |
+| minimum_gif_delay | int | 10 | Minimum GIF animation delay
+| | | | |
+| send_referer | bool | true | Whether to send the referer HTTP |
+| | | | header. |
+| | | | |
+| foreground_images | bool | true | Whether to fetch foreground images
+| | | | |
+| background_images | bool | true | Whether to fetch background images
+| | | | |
+| animate_images | bool | true | Whether to animate images
+| | | | |
+| enable_javascript | bool | false | Whether to execute javascript
+| | | | |
+| script_timeout | int | 10 | Maximum time to wait for a script|
+| | | | to run in seconds |
+| | | | |
+| expire_url | int | 28 | How many days to retain URL data |
+| | | | for. |
+| | | | |
+| font_default | int | 0 | Default font family
+| | | | |
+| ca_bundle | string | NULL | ca-bundle location
+| | | | |
+| ca_path | string | NULL | ca-path location
+| | | | |
+| cookie_file | string | NULL | Cookie file location
+| | | | |
+| cookie_jar | string | NULL | Cookie jar location
+| | | | |
+| homepage_url | string | NULL | Home page location
+| | | | |
+| search_url_bar | bool | false | search web from url bar
+| | | | |
+| search_provider | int | 0 | default web search provider
+| | | | |
+| url_suggestion | bool | true | URL completion in url bar
+| | | | |
+| window_x | int | 0 | default x position of new windows
+| | | | |
+| window_y | int | 0 | default y position of new windows
+| | | | |
+| window_width | int | 0 | default width of new windows
+| | | | |
+| window_height | int | 0 | default height of new windows
+| | | | |
+| window_screen_width | int | 0 | width of screen when above |
+| | | | options were saved |
+| | | | |
+| window_screen_height | int | 0 | height of screen when above |
+| | | | options were saved |
+| | | | |
+| toolbar_status_size | int | 6667 | default size of status bar vs. |
+| | | | h scroll bar |
+| | | | |
+| scale | int | 100 | default window scale
+| | | | |
+| incremental_reflow | bool | true | Whether to reflow web pages while|
+| | | | objects are fetching |
+| | | | |
+| min_reflow_period | uint | 25 | Minimum time (in cs) between HTML|
+| | | | reflows while objects are fetching
+| | | | |
+| core_select_menu | bool | false | Use core selection menu |
+| | | | |
++----------------------+--------+-----------+----------------------------------+
+
+[1] http://www.w3.org/Submission/2011/SUBM-web-tracking-protection-20110224/#dnt-uas
+
+Fetcher options
+===============
+
++--------------------------+------+------+-------------------------------------+
+| Option Key | Type | Dflt | Description |
++--------------------------+------+------+-------------------------------------+
+| max_fetchers | int | 24 | Maximum simultaneous active fetchers|
+| | | | |
+| max_fetchers_per_host | int | 5 | Maximum simultaneous active fetchers|
+| | | | per host. (<=option_max_fetchers |
+| | | | else it makes no sense) [2] |
+| | | | |
+| max_cached_fetch_handles | int | 6 | Maximum number of inactive fetchers |
+| | | | cached. The total number of handles|
+| | | | netsurf will therefore have open is|
+| | | | this plus option_max_fetchers. |
+| | | | |
+| suppress_curl_debug | bool | true | Suppress debug output from cURL. |
+| | | | |
+| target_blank | bool | true | Whether to allow target="_blank" |
+| | | | |
+| button_2_tab | bool | true | Whether second mouse button opens in|
+| | | | new tab. |
+| | | | |
++--------------------------+------+------+-------------------------------------+
+
+[2] Note that rfc2616 section 8.1.4 says that there should be no more
+ than two keepalive connections per host. None of the main browsers
+ follow this as it slows page fetches down considerably.
+ See https://bugzilla.mozilla.org/show_bug.cgi?id=423377#c4
+
+
+PDF / Print options
+===================
+
++------------------------+------+-------+--------------------------------------+
+| Option Key | Type | Deflt | Description |
++------------------------+------+-------+--------------------------------------+
+| margin_top | int | 10 | top margin of exported page |
+| | | | |
+| margin_bottom | int | 10 | bottom margin of exported page |
+| | | | |
+| margin_left | int | 10 | left margin of exported page |
+| | | | |
+| margin_right | int | 10 | right margin of exported page |
+| | | | |
+| export_scale | int | 70 | scale of exported content |
+| | | | |
+| suppress_images | bool | false | suppressing images in printed content|
+| | | | |
+| remove_backgrounds | bool | false | turning off all backgrounds for |
+| | | | printed content |
+| | | | |
+| enable_loosening | bool | true | turning on content loosening for |
+| | | | printed content |
+| | | | |
+| enable_PDF_compression | bool | true | compression of PDF documents |
+| | | | |
+| enable_PDF_password | bool | false | setting a password and encoding PDF |
+| | | | documents |
++------------------------+------+-------+--------------------------------------+
+
+System colours
+==============
+
+These are the css system colours which the browser also uses to style
+generated output.
+
++--------------------------------+--------+------------+
+| Option Key | Type | Default |
++--------------------------------+--------+------------+
+| sys_colour_ActiveBorder | colour | 0x00d3d3d3 |
+| sys_colour_ActiveCaption | colour | 0x00f1f1f1 |
+| sys_colour_AppWorkspace | colour | 0x00f1f1f1 |
+| sys_colour_Background | colour | 0x006e6e6e |
+| sys_colour_ButtonFace | colour | 0x00f9f9f9 |
+| sys_colour_ButtonHighlight | colour | 0x00ffffff |
+| sys_colour_ButtonShadow | colour | 0x00aeaeae |
+| sys_colour_ButtonText | colour | 0x004c4c4c |
+| sys_colour_CaptionText | colour | 0x004c4c4c |
+| sys_colour_GrayText | colour | 0x00505050 |
+| sys_colour_Highlight | colour | 0x00c00800 |
+| sys_colour_HighlightText | colour | 0x00ffffff |
+| sys_colour_InactiveBorder | colour | 0x00f1f1f1 |
+| sys_colour_InactiveCaption | colour | 0x00e6e6e6 |
+| sys_colour_InactiveCaptionText | colour | 0x00a6a6a6 |
+| sys_colour_InfoBackground | colour | 0x008fdfef |
+| sys_colour_InfoText | colour | 0x00000000 |
+| sys_colour_Menu | colour | 0x00f1f1f1 |
+| sys_colour_MenuText | colour | 0x004e4e4e |
+| sys_colour_Scrollbar | colour | 0x00cccccc |
+| sys_colour_ThreeDDarkShadow | colour | 0x00aeaeae |
+| sys_colour_ThreeDFace | colour | 0x00f9f9f9 |
+| sys_colour_ThreeDHighlight | colour | 0x00ffffff |
+| sys_colour_ThreeDLightShadow | colour | 0x00ffffff |
+| sys_colour_ThreeDShadow | colour | 0x00d5d5d5 |
+| sys_colour_Window | colour | 0x00f1f1f1 |
+| sys_colour_WindowFrame | colour | 0x004e4e4e |
+| sys_colour_WindowText | colour | 0x00000000 |
++--------------------------------+--------+------------+