Help:Cascading Style Sheets

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Cascading Style Sheets allows for flexible formatting of a page. They should be used instead of tables for non-tabular content whenever possible, because they can be manipulated by the reader or overridden by an author if your CSS is embedded in another page via a template.

Levels of CSS settings

Style may be chosen specifically for a piece of content, see e.g., color; scope of parameters

Alternatively, style is specified for CSS selectors, expressed in terms of elements, classes, and ID's. This is done on various levels:

Author style sheets, in this order:

MediaWiki core style-sheets

Per skin: MediaWiki Manual:Gallery of user styles etc. Typically loaded style sheets:

Skin-specific main file

e.g., monobook/main.css (normal skin for PC's), chick/main.css (normal skin for handhelds)

Browser-specific fixes (also skin-specific)

Examples for Monobook:

Site-wide style-sheets

Note: MediaWiki sites other than English Wikipedia may use MediaWiki:Gadget-site.css instead of MediaWiki:Common.css.

Page-specific style-sheets

Some pages have their own CSS, e.g., MediaWiki:FileUploadWizard.css

User-specific style-sheets

Note that in CSS terminology, the user-specific style sheets are not user style sheets.

Usage

An HTML element may be just taken from the wikitext (see HTML in wikitext), e.g., span, or the result of translating wikitext, e.g., the '''...''' code is changed into <b>...</b>, or part of the code for the skin.

A class may be produced by the software, e.g., ns-namespace number for the HTML-element "body", and extiw for an interwiki link in the page body, or taken from the wikitext.

Similarly, an ID may be produced by the software, e.g., bodyContent, or taken from the wikitext.

In the case of conflicting style settings for a piece of content, the resulting setting depends primarily on the indication "!important". Secondarily, if both are important, the user wins, if neither is, the author wins. Tertiarily it depends on specificity. Only lastly, it depends on order between and within style sheets: the last wins. Thus, a User:username/monobook.css does not win from MediaWiki:Monobook.css (both author, not user) if the specificity of the latter is greater. See also cascade.

Supported elements

MediaWiki supports most CSS, with such exceptions as the url() attribute. There were some bugs in CSS support in earlier versions.

Further information: the Cascading Style Sheets Level 2 Revision 1 (CSS 2.1) Specification

CSS in wikitext

You can use CSS styling in HTML elements in your code (see Help:HTML in wikitext for a list of elements supported by MediaWiki) like you would in normal HTML markup.

For example, a <div>...</div> element with a green border and its contents floated to the right would be created with 

<div style="float:right; border:thin solid green;">
Here comes a short paragraph that is<br />
contained in a "div" element that is<br />
floated to the right.
</div>

Here comes a short paragraph that is
contained in a "div" element that is
floated to the right.

which would produce the box to the right. Some wikitext elements allow you to insert CSS styling directly into them. An example is the table syntax: 

{| style="your style here"
|-
|your table stuff
|}
Further information: Help:Tables

MediaWiki existing styles

You may wish to use a style type that is already predefined by MediaWiki, or the site that you are visiting. You can also create a style that is unique to your page.

Vector is the default style, you can view it at: MediaWiki:Vector.css

You will give your CSS tag an existing "class"

Please put a list of existing classes here.

Tips and tricks

Non-display

In an embedded page, one can hide comments in one version, and show them in another view. One extreme "style" for a text is not displaying it, with 

.''classname'' {display: none}
#''id'' {display: none}

etc.

Non-displayed links do not work (as opposed to links in a very small font).

It cannot be used to remove text in expressions for template names, parameter names, parameter values, page names in links, etc.

To view hidden text, download the Web Developer Toolbar for Firefox here, then choose Misc. → show hidden elements in that toolbar. It will make all hidden elements appear.

Non-print

One can exclude content from being printed (if the browser supports CSS) by declaring the content to be of the "noprint" class: 

<div class="someclass noprint">This will not appear in the print version.</div>

Major style blocks

An annotated desktop screenshot of an example article, showcasing the style blocks
  • column-content – overall space within the margins of which the content exists.
  • firstHeading – the class of the heading tag at the top of every page
  • contentSub – the name of the wiki immediately underneath the main heading, but above the body text
  • content – the white background, thin bordered box which contains the main page content.
  • bodyContent – the main page content within the content box

The portlet class is the style used by all the div blocks around the main content. Identified blocks using that class:

  • p-cactions – id for the list of page-related tabs above the main content (page, talk, edit, etc.), top.
  • p-personal – id for the list of user-related links above the main content (username, talk, etc.), top.
  • p-logo – id for the block that contains the logo, top left.
  • p-navigation – id for the block that contains the navigation links on the left of the page
  • p-search – the block that contains the search buttons
  • p-tb – the block that contains the toolbox links
  • p-lang – the block that contains interlanguage links

The footer at the bottom of the page includes blocks with the following ids

  • footer – overall footer container block
  • f-poweredbyico – the powered by MediaWiki image that normally resides to the right of the page
  • f-list – id for the list that contains all the bits of text at the bottom of the page

Style depending on a parameter or variable

Variable class or id

A class or id can depend on the result produced by a template or on a template parameter, e.g. class="abc{{{1|def}}}". For one or more of the possible class names the style of that class can be defined. If the class is undefined it is ignored, so the standard style is used.

In the simplest case we have e.g. class="abc{{{1}}}" and define class abcdef. If the parameter value is "def" it applies.

If a page for general use only makes sense when styles are defined for certain classes, then these have to be specified in the page MediaWiki:Common.css, which applies for all users and all skins, as far as not overridden.

Variable style parameter value

Wikitext that reads 

<span style="display:{{{3|none}}}">Wed</span>

will display "Wed" if parameter 3 is defined, but its value is not "none", and displays nothing if parameter 3 is undefined or "none". If the value of parameter 3 is a display style other than "none", that style is applied.

Wiki headings

Wiki headings use the following default CSS: <section begin="HTML_section" />

Wikimarkup HTML Style
= Heading = <h1> 
color: #000000; background: none; overflow: hidden; page-break-after: avoid; font-size: 1.8em; font-family: 'Linux Libertine',Georgia,Times,serif; margin-top: 1em; margin-bottom: 0.25em; line-height: 1.3; padding: 0; border-bottom: 1px solid #AAAAAA;
== Heading == <h2> 
color: #000000; background: none; overflow: hidden; page-break-after: avoid; font-size: 1.5em; font-family: 'Linux Libertine',Georgia,Times,serif; margin-top: 1em; margin-bottom: 0.25em; line-height: 1.3; padding: 0; border-bottom: 1px solid #AAAAAA;
=== Heading === <h3> 
color: #000000; background: none; overflow: hidden; page-break-after: avoid; font-size: 1.2em; font-weight: bold; margin-top: 0.3em; margin-bottom: 0; line-height: 1.6; padding-top: 0.5em; padding-bottom: 0;
==== Heading ==== <h4> 
color: #000000; background: none; overflow: hidden; page-break-after: avoid; font-size: 100%; font-weight: bold; margin-top: 0.3em; margin-bottom: 0; line-height: 1.6; padding-top: 0.5em; padding-bottom: 0;
===== Heading ===== <h5> 
color: #000000; background: none; overflow: hidden; page-break-after: avoid; font-size: 100%; font-weight: bold; margin-top: 0.3em; margin-bottom: 0; line-height: 1.6; padding-top: 0.5em; padding-bottom: 0;
====== Heading ====== <h6> 
color: #000000; background: none; overflow: hidden; page-break-after: avoid; font-size: 100%; font-weight: bold; margin-top: 0.3em; margin-bottom: 0; line-height: 1.6; padding-top: 0.5em; padding-bottom: 0;

<section end="HTML_section" />

See also

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