created: 20140720164948099
modified: 20250819181815032
tags: Mechanisms
title: InfoMechanism
type: text/vnd.tiddlywiki

\procedure example(name)
<$text text={{{ [[$:/info/url/]addsuffix<name>get[text]] }}} />
\end

System tiddlers in the namespace `$:/info/` are used to expose information about the system (including the current browser) so that WikiText applications can adapt themselves to available features.

! Information Tiddlers

|!Title |!Description |
|[[$:/info/startup-timestamp]] |<<.from-version "5.1.23">> Startup timestamp in TiddlyWiki date format |
|[[$:/info/browser]] |Running in the browser? ("yes" or "no") |
|[[$:/info/mobile]] |<<.from-version "5.2.3">> Is running on a mobile device? ("yes" or "no" - eg, ''<<example full>>'') |
|[[$:/info/browser/language]] |<<.from-version "5.1.20">> Language as reported by browser (note that some browsers report two character codes such as `en` while others report full codes such as `en-GB`) |
|[[$:/info/browser/screen/width]] |Screen width in pixels |
|[[$:/info/browser/screen/height]] |Screen height in pixels |
|[[$:/info/browser/darkmode]] |<<.from-version "5.4.0">> Is dark mode preferred? ("yes" or "no") |
|[[$:/info/darkmode]] |<<.deprecated-since "5.4.0">> Alias for  $:/info/browser/darkmode |
|`$:/info/browser/window/*` |<<.from-version "5.4.0">> Tiddlers reporting window dimensions, updated when the windows are resized |
|[[$:/info/node]] |Running under [[Node.js]]? ("yes" or "no") |
|[[$:/info/url/full]] |<<.from-version "5.1.14">> Full URL of wiki (eg, ''<<example full>>'') |
|[[$:/info/url/host]] |<<.from-version "5.1.14">> Host portion of URL of wiki (eg, ''<<example host>>'') |
|[[$:/info/url/hostname]] |<<.from-version "5.1.14">> Hostname portion of URL of wiki (eg, ''<<example hostname>>'') |
|[[$:/info/url/origin]] |<<.from-version "5.1.14">> Origin portion of URL of wiki (eg, ''<<example origin>>'') |
|[[$:/info/url/pathname]] |<<.from-version "5.1.14">> Pathname portion of URL of wiki (eg, ''<<example pathname>>'') |
|[[$:/info/url/port]] |<<.from-version "5.1.14">> Port portion of URL of wiki (eg, ''<<example port>>'') |
|[[$:/info/url/protocol]] |<<.from-version "5.1.14">> Protocol portion of URL of wiki (eg, ''<<example protocol>>'') |
|[[$:/info/url/search]] |<<.from-version "5.1.14">> Search portion of URL of wiki (eg, ''<<example search>>'') |
|[[$:/info/darkmode]] |<<.from-version "5.1.23">> Is dark mode enabled? ("yes" or "no") |

! Main Window Dimension Tiddlers

<<.from-version "5.4.0">> These tiddlers reports the dimensions of the main ~TiddlyWiki window and are updated automatically whenever the main window is resized.

|!Title |!Description |
|[[$:/info/browser/window/system/main/outer/width]] |Full browser window including chrome, tabs, toolbars |
|[[$:/info/browser/window/system/main/outer/height]] |Full browser window including chrome, tabs, toolbars |
|[[$:/info/browser/window/system/main/inner/width]] |Viewport width including scrollbars |
|[[$:/info/browser/window/system/main/inner/height]] |Viewport height including scrollbars |
|[[$:/info/browser/window/system/main/client/width]] |Content width excluding scrollbars |
|[[$:/info/browser/window/system/main/client/height]] |Content height excluding scrollbars |

! User-Created Window Dimension Tiddlers

<<.from-version "5.4.0">> These tiddler reports the dimensions of additional windows opened via [[tm-open-window|WidgetMessage: tm-open-window]]. The windowID used when opening the window is used to identify the corresponding info tiddlers. These tiddlers are updated automatically whenever the main window is resized.

|!Title |!Description |
|`$:/info/browser/window/user/<windowID>/outer/width` | Full browser window including chrome, tabs, toolbars |
|`$:/info/browser/window/user/<windowID>/outer/height` | Full browser window including chrome, tabs, toolbars |
|`$:/info/browser/window/user/<windowID>/inner/width` |Viewport width including scrollbars |
|`$:/info/browser/window/user/<windowID>/inner/height` |Viewport height including scrollbars |
|`$:/info/browser/window/user/<windowID>/client/width` |Content width excluding scrollbars |
|`$:/info/browser/window/user/<windowID>/client/height` |Content height excluding scrollbars |