Extension:TemplateStylesExtender

MediaWiki extensions manual

TemplateStylesExtender Release status: stable
Implementation	Parser extension
Description	Extends Extension:TemplateStyles with new selectors
Author(s)	Octfxtalk
Latest version	2.0.0 (2025-06-02)
MediaWiki	1.43+
PHP	>=8.0
Composer	octfx/template-styles-extender
License	GNU General Public License 2.0 or later
Download	GitHub: project page git repository URL [help ] commit history Note: No localisation updates are provided by translatewiki.net .
Parameters $wgTemplateStylesExtenderCustomPropertiesDeclaration $wgTemplateStylesExtenderExtendCustomPropertiesValues $wgTemplateStylesExtenderEnableUnscopingSupport $wgTemplateStylesExtenderUnscopingPermission
Hooks used ParserFirstCallInit TemplateStylesPropertySanitizer TemplateStylesStylesheetSanitizer

The TemplateStylesExtender extension extends Extension:TemplateStyles with new selectors and matchers. TemplateStylesExtender is developed based on css-sanitizer 5.5.0, which is being used by MediaWiki 1.43.

Features

• Declare CSS custom properties/variables
• Use CSS custom properties/variables in most properties
• Implement additional properties and values as listed below

Module	Changes	Upstream task
Basic User Interface Module Level 4	Added property: pointer-events	T342271
Box Sizing Module Level 4	Backported for css-sanitizer 5.5.0	T375344
Cascading and Inheritance Level 5	Added value: revert-layer	-
Color Module Level 4	Added: Alpha HEX notation	T265675
Color Module Level 5	Added: Relative color, color()	-
Containment Module Level 3	Added properties: contain, content-visibility	-
Filter Effects Module Level 2	Added property: backdrop-filter	-
Fonts Module Level 4	Added properties: font-optical-sizing, font-variation-settings, ascent-override, descent-override, font-display, line-gap-override	-
Fonts Module Level 5	Added property: size-adjust	-
Masking Module Level 1	Added property: -webkit-mask-image	-
Ruby Annotation Layout Module Level 1	Added properties: ruby-align, ruby-position	T277755
Scroll Snap Module Level 1	Added properties: scroll-margin, scroll-padding, scroll-snap-align, scroll-snap-stop, scroll-snap-type	T271598
Values and Units Module Level 4	Added function: clamp()	T394619

Installation

• Download and place the file(s) in a directory called TemplateStylesExtender in your extensions/ folder.
• Add the following code at the bottom of your LocalSettings.php file:

  wfLoadExtension( 'TemplateStyles' );
  wfLoadExtension( 'TemplateStylesExtender' );
  

• Configure as required.
• Done – Navigate to Special:Version on your wiki to verify that the extension is successfully installed.

Configuration

Configuration	Description	Default
$wgTemplateStylesExtenderCustomPropertiesDeclaration	Allow CSS custom properties (CSS variables) to be declared as properties	true
$wgTemplateStylesExtenderExtendCustomPropertiesValues	Allow the CSS custom properties (CSS variables) to be used as values in all properties	true
$wgTemplateStylesExtenderEnableUnscopingSupport	Allows users with unscope permissions to unscope CSS by setting a wrapclass attribute.	false
$wgTemplateStylesExtenderUnscopingPermission	Specify a permission group that is allowed to unscope CSS.	editinterface

Note CSS Vars

Currently using :root selectors won't work due to template styles prepending .mw-parser-output.

One possible fix is to wrap the entire content into a 'div' element and adding the declarations to this, e.g.

div#content-wrap {
   --padding: 10px
}

.content {
   padding: var( --padding )
}

Wikitext

<div id="content-wrap">
   <div class="content">
      The WikiText...
   </div>
</div>

Unscoping of CSS

Example: results in the CSS being scoped to .mediawiki instead of .mw-parser-output.

Including such a call in a page essentially limits editing to users with the editinterface right. You can alternatively include a call to a template that includes the styles.

See also

• Extension:TemplateStyles