Help:Advanced CSS and JS
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Creating some custom code for your community, or for your own account? This page has more background details to help you with both.
For a more basic overview, see Help:CSS and JS customization.
CSS and JS cheatsheet
Edit
The tables below are summarized guides to most of CSS and JS customization pages. The most common choices are highlighted in green.
| Stylesheet | Located at | Affected wikias | Affected users | Affected skins |
|---|---|---|---|---|
| MediaWiki:Wikia.css | this wikia | this wikia | all users | Wikia (default) |
| MediaWiki:Common.css | this wikia | this wikia | all users | varies |
| MediaWiki:Monobook.css | this wikia | this wikia | all users | Monobook |
| Special:MyPage/common.css | this wikia | this wikia | you only | all |
| Special:MyPage/wikia.css | this wikia | this wikia | you only | Wikia (default) |
| Special:MyPage/monobook.css | this wikia | this wikia | you only | Monobook |
| w:Special:MyPage/global.css | Community Central | all wikias | you only | all |
| Script file | Located at | Affected wikias | Affected users | Affected skins |
|---|---|---|---|---|
| MediaWiki:Common.js | this wikia | this wikia | all users | all |
| MediaWiki:Wikia.js | this wikia | this wikia | all users | Wikia (default) |
| MediaWiki:Monobook.js | this wikia | this wikia | all users | Monobook |
| Special:MyPage/common.js | this wikia | this wikia | you only | all |
| Special:MyPage/wikia.js | this wikia | this wikia | you only | Wikia (default) |
| Special:MyPage/monobook.js | this wikia | this wikia | you only | Monobook |
| w:Special:MyPage/global.js | Community Central | all wikias | you only | all |
CSS and JS editor error checkingEdit
Wikia's CSS and JS editors have active error checking ("linting") and syntax highlighting:
- As you type code, the page will let you know about any errors in the syntax that might have occurred
- Note that not every issue has to be solved - CSS (and even JS) technology is ever evolving, and browsers do not all behave identically: some messages may not require action.
Common issuesEdit
| Issue | Explanation |
|---|---|
@import prevent parallel downloads, use <link> instead
| Link tags are normally used to import CSS. However, MediaWiki does not support adding your own link tags without use of JS, so this error can normally be ignored. |
Expected X but found Y
| This means you have entered an invalid value for a property. For example, in 'color: foo;' foo is an invalid value for the color property because it is not a color.
|
Use of !important
| !important should generally be avoided in CSS as it can makes it harder to maintain, and also makes it harder for users to override settings in their personal CSS. Most of the time, using the correct selector will help you avoid using !important.
|
Unknown property 'codename'
| Although not all CSS code is recognized by the tool (as CSS itself is a frequently updated artform), certain CSS codes can still be read when they are implemented for a certain object on the Wikia page (For example, mix-blend-mode: color-dodge;).
|
Advanced notesEdit
- Applying CSS to specific pages
- Using CSS classes, you can apply CSS to specific pages. The
<body>HTML element on Wikia articles includes a unique identifier based on the name of the page. For example, on this help page, the class is:page-Help_Advanced_CSS_and_JS
- The general format is '
page-[article name]', and spaces and colons are replaced by underscores. - There are other classes on the body tag that allow you to apply code by namespace, and more - a browser's 'inspect' or 'view source' functionality will let you see what is available.
- Load orders
- The general load order on Wikia is: core code, then local community code, then personal code.
- Within each level, the load order is: 'common' code, then skin-specific code.
- !important in CSS
- Due to CSS load orders, you may sometimes need to make use of the !important property to ensure a CSS rule is applied.
- Caching issues
- Every file you download from the Internet gets cached. Normally that's great because it reduces traffic both for your own device and for Wikia's servers, but it can be a problem when it comes to testing design changes. It may take a while before your changes to take effect unless you use the following tricks:
Note: After saving, you may have to bypass your browser's cache to see the changes.
- Chrome - Windows: Hold the Ctrl key and press the F5 key. OS X: Hold both the ⌘ Cmd and ⇧ Shift keys and press the R key.
- Safari - Hold down the ⇧ Shift key and click the Reload toolbar button.
- Firefox - Windows: Hold the Ctrl key, and press F5. OS X: Hold the ⌘ Cmd and ⇧ Shift keys, and then press R.
- Internet Explorer - Hold the Ctrl key, and press F5 (or click the Refresh button).
- You may need to manually refresh each page you recently opened to see the change there.
- Popular JavaScript snippets
- To get an idea of some scripts others have written that you might find useful or would like to try, take a look at the list of JS Enhancements on the Developers Wiki.
- Duplicate JavaScript
- Many scripts can have problems if they run multiple times on the same page. Make sure write the code such that a particular piece of code runs only once. Avoid pasting the same code in multiple files as it will likely conflict and cause confusing errors for you and other visitors.
Further readingEdit
- Help:Including additional CSS and JS - how to import CSS and JS files
- Help:Custom chat CSS and JS - using custom CSS and JS on chat
- Help:How to import Google Fonts - choose your own fonts
- Help:CSS and JS customization - the hub page for all CSS and JS details
Further help and feedbackEdit
- Browse and search other help pages at Help:Contents
- Check Help:Wikia Community Central for sources of further help and support
- Check Help:Contacting Wikia for how to report any errors or unclear steps in this article
