https://wiki.perfecttower2.com/w/index.php?action=history&feed=atom&title=Module%3AColor_contrast%2Fdoc 2026-10-07T15:21:49Z Revision history for this page on the wiki MediaWiki 1.43.11 https://wiki.perfecttower2.com/w/index.php?title=Module:Color_contrast/doc&diff=4336&oldid=prev 2026-10-07T01:50:20Z

<p>Documentation</p> <p><b>New page</b></p><div>Computes the relative luminance of CSS colors and the contrast ratio between two colors (the WCAG formula). It is an older copy of [[wikipedia:Module:Color contrast|Wikipedia&#039;s Module:Color contrast]].<br /> <br /> On this wiki only [[Module:Navbox]] uses it: on template pages, &lt;code&gt;_styleratio&lt;/code&gt; checks every &lt;code&gt;*style&lt;/code&gt; parameter of a navbox, and a ratio below 4.5 adds the tracking category &quot;Potentially illegible navboxes&quot;. The wrapper templates named at the top of the source (&lt;code&gt;&lt;nowiki&gt;{{Color contrast ratio}}&lt;/nowiki&gt;&lt;/code&gt; and others) don&#039;t exist here.<br /> <br /> Colors can be CSS names (looked up in [[Module:Color contrast/colors]]), &lt;code&gt;#rgb&lt;/code&gt;, &lt;code&gt;#rrggbb&lt;/code&gt;, &lt;code&gt;rgb()&lt;/code&gt; with numbers or percentages, and &lt;code&gt;hsl()&lt;/code&gt;. A color it can&#039;t read gives an empty string.<br /> <br /> Entry points for &lt;code&gt;#invoke&lt;/code&gt; take positional arguments from the invoke, or from the calling template when the invoke has none:<br /> * &lt;code&gt;lum&lt;/code&gt;: the luminance of color &lt;code&gt;1&lt;/code&gt;, from 0 (black) to 1 (white).<br /> * &lt;code&gt;ratio&lt;/code&gt;: the contrast ratio of colors &lt;code&gt;1&lt;/code&gt; and &lt;code&gt;2&lt;/code&gt;. &lt;code&gt;error&lt;/code&gt; sets the text for colors it can&#039;t read (default &lt;code&gt;?&lt;/code&gt;).<br /> * &lt;code&gt;styleratio&lt;/code&gt;: the contrast between &lt;code&gt;background&lt;/code&gt; or &lt;code&gt;background-color&lt;/code&gt; and &lt;code&gt;color&lt;/code&gt; in the CSS text &lt;code&gt;1&lt;/code&gt;. &lt;code&gt;2&lt;/code&gt; and &lt;code&gt;3&lt;/code&gt; are the background and text colors to assume when the CSS doesn&#039;t set them (white and black).<br /> * &lt;code&gt;greatercontrast&lt;/code&gt;: of colors &lt;code&gt;2&lt;/code&gt; (default white) and &lt;code&gt;3&lt;/code&gt; (default black), the one with more contrast against color &lt;code&gt;1&lt;/code&gt;. &lt;code&gt;bias&lt;/code&gt; favors color &lt;code&gt;2&lt;/code&gt;; &lt;code&gt;css&lt;/code&gt; returns a &lt;code&gt;background-color: …; color: …;&lt;/code&gt; declaration instead.<br /> <br /> Lua modules call the same functions with an underscore: &lt;code&gt;_lum(color)&lt;/code&gt;, &lt;code&gt;_ratio(args)&lt;/code&gt;, &lt;code&gt;_styleratio(args)&lt;/code&gt; and &lt;code&gt;_greatercontrast(args)&lt;/code&gt;.<br /> &lt;includeonly&gt;<br /> &lt;!-- Categories below this line --&gt;<br /> <br /> &lt;/includeonly&gt;&lt;noinclude&gt;<br /> [[Category:Module documentation pages]]<br /> &lt;/noinclude&gt;</div>

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