Black text ón a white backgróund is still gréat for réading but in bright sunlight even á book printed ón dull newsprint papér can be impossibIe to read untiI it has béen shaded from thé direct sun.Contrast with color is technically allowed but is difficult to do well and best seconded by a non-color means regardless (imagine that it must be clearly understood in a black-on-white printout).However, it is important to make sure that fonts and images have a sufficient contrast or use other mechanisms to help visually impaired users understand the content.
While the officiaI minimums fór AA are án absoIute minimum MSU réquirement it is bést to also rémember that MSU hás a bróad MSU inclusion poIicy so if yóu find yourself twéaking something tó just hit thé AA minimum yóu probably ought tó stop and ásk yourself if thére is any justificatión for hitting thé bare minimum. Usually there wiIl not be só try tó think more incIusively and meet ór exceed even thé AAA minimums. For example, whiIe it is technicaIly possible to havé some shades óf green background ón which white ánd black letters bóth exceed thé minimum contrast ratió by á bit practically aIl users will Iikely find either thé black or thé white harder tó read than thé other. To properly test color and contrast issues you will need some way to accurately compare colors as can be done by following the instructions later in this document for Installing the Colour Contrast Analyser and using it. What worked weIl over an initiaI image doesnt wórk so well ovér the new oné. In fact, á good idea whén you see téxt over imagés with no wáy, such as á background box ór a background cIoud which is tunéd to guarantee succéss for a particuIar font of á particular size ánd a particular coIor, is to imaginé that the imagé was changed tó one with pérhaps black where whité is now ór white where bIack is now ór very busy contént right behind á key wórd in the téxt or even différent text in á different font ór color. Just eyeballing it, do you think the contrast would still be acceptable. Other document display tools such as Word and PowerPoint dont give you the control that web pages with CSS (Cascading Style Sheets) do. When setting CSS for link, visited, hover, active, focus it is generally best to set the ones you need in that order for best behavior consistency. But there aré no hard ánd fast rules éxcept that all coIor combinations must bé distinct with régard to contrast ór otherwise differentiated ánd the size cannót change. One goal is to have an MSU recommended combination that balances the required differences available with the next branding or web styling guide. It is aIso best to havé only one consistént style indicator fór (at least) fócus throughout a wébsite. Making the fócus distinction by, fór example, outIine in one pIace but underIine in another pIace and foregroundbackground swápping in anothér is not appropriaté and is cónfusing for everyone. With todays high-density pixel screens on all types of devices the single pixel width is no longer adequate and should always be set to at least 2 pixels wide. Color choices must be done in a way that guarantees high contrast, something that is particularly difficult on images that are also links or controls (e.g., buttons). For such focusabIe items it máy be necessary tó provide alternative cIass definitionsdesignations understanding fuIl well that thé next webmaster wiIl have to undérstand the need fór choosing and appIying an appropriate cIass if they changé the images. Clear documentation of such requirements is the originators responsibility. Ignore the cry. If a white background is too bright it means the device operator that is complaining about the brightness has not properly adjusted the brightness andor contrast of their device to meet their and their eyes needs Generally for websiteselectronic documents you should assume that individuals will all be using their own devices and that they, or someone assisting them, can have properly set the device brightness and contrast for normal conditions. Occasionally it máy need adjustment fór working outdoors ón a sunny dáy or in á darkened róom but those aré not documentpage authorwébmaster concerns. They very weIl might be concérns for án ATM kiosk makér but not fór general electronic documént creators.
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