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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.
A guide on using colors in web design and development, covering color theory, accessibility, and practical applications.
CSS 2, SVG and CSS 2.1 allow web authors to use system colors, which are color names whose values are taken from the operating system, picking the operating system's highlighted text color, or the background color for tooltip controls.
To demonstrate specificity Inheritance Inheritance is a key feature in CSS; it relies on the ancestor-descendant relationship to operate. Inheritance is the mechanism by which properties are applied not only to a specified element but also to its descendants. Inheritance relies on the document tree, which is the hierarchy of XHTML elements in a page based on nesting. Descendant elements may ...
Note that if someone is using a custom skin that specifies different link colors, for example, green for internal links, and purple for "redlinks," a link formatted with this code will still look blue, and not match other links in appearance, to that user.
Furthermore, the actual color seen by a user will vary slightly according to their operating system, desktop settings, and browser, as well as their monitor and for low-end LCDs, viewing angle. Logged-in users can also change the colors they see by selecting a different skin or using custom CSS.
The background figure is the CIE xy chromaticity diagram. The choice of primary colors is related to the physiology of the human eye; good primaries are stimuli that maximize the difference between the responses of the cone cells of the human retina to light of different wavelengths, and that thereby make a large color triangle. [7]
These color tables should help editors choose accessible backgrounds matching various color schemes. The first table contains WCAG AAA compatible for 14 different hues, plus grey and brown. In each row, the "base color" is the simplest representation of the hue.