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packed All images aligned by having same height, justified, captions centered under images; packed-overlay Like packed, but caption overlays the image, in a translucent box; packed-hover Like packed-overlay, but caption is only visible on hover (degrades gracefully on screen readers, and falls back to packed-overlay if a touch screen is used)
Site-wide for specialist purposes: MediaWiki:Print.css, MediaWiki:Noscript.css, MediaWiki:Filepage.css Site-wide if gadgets loaded: see Wikipedia:Gadget for more information Note: MediaWiki sites other than English Wikipedia may use MediaWiki:Gadget-site.css instead of MediaWiki:Common.css.
Global attributes apply to all tags. Attributes not listed here are not allowed by MediaWiki [1]: class: one or more classifications to which the element belongs. See Wikipedia:Catalogue of CSS classes. dir: text direction— "ltr" (left-to-right), "rtl" (right-to-left) or "auto". id: unique identifier for the element.
MediaWiki:Common.css, MediaWiki:Print.css (hidden when printed from articles) {} meta-template that is used to create most article message boxes. autocomment Used for the section bits in edit summaries, i.e. the part between /* and */ on watchlist and rc pages. common/shared.css: includes/Linker.php: autonumber
The markup language called wikitext, also known as wiki markup or wikicode, consists of the syntax and keywords used by the MediaWiki software to format a page. (Note the lowercase spelling of these terms.
For lines of CSS which should be different on different MediaWiki projects, e.g. for a different background color for easy distinction, clearly the local CSS cannot be used; at least these lines should be put in the user subpages. Some computers, e.g. in internet cafes, mobile devices/tablets, do not allow users to set preferences for the browser.
{{CSS and JS MediaWiki messages | state = expanded}} will show the template expanded, i.e. fully visible. {{ CSS and JS MediaWiki messages | state = autocollapse }} will show the template autocollapsed, i.e. if there is another collapsible item on the page (a navbox, sidebar , or table with the collapsible attribute ), it is hidden apart from ...
These are typically built into browsers, in their DevTools window. Debuggers allow you to step debug (go through your JavaScript code line-by-line, hover over variables to see their values, etc.) Firefox - use Tools → JavaScript Console showing all JavaScript and CSS errors. Chrome and Edge - use Tools → Developer Tools.