Test if computer is in high contrast mode (i.e. if browser is not displaying background images). Defines has("highcontrast") and sets dj_a11y CSS class on <body> if machine is in high contrast mode. Returns has() method;
(); See the dojo/hccss reference documentation for more information.
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http://dojotoolkit.org/api/1.10/dojo/hccss.html