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The optimum region is expressed with color in browsers, which means that this feature cannot currently be used without violating WCAG 1.4.1 Use of Color We need a way to express the optimum, sub-optimum, sub-sub-optimum via accessibility APIs. In UIA, we propose to do this by adding the Value pattern in addition to the specified RangeValue pattern. The numberic value of the meter would continue to be stored in RangeValue:Value and the optimum state would be stored in Value:Value as Good, Fair, Poor. WCAG 1.4.1 http://www.w3.org/TR/WCAG20/#visual-audio-contrast-without-color HTML-AAM Meter http://w3c.github.io/aria/html-aam/html-aam.html#el-meter HTML meter element optimum point http://www.w3.org/TR/html51/semantics.html#the-meter-element:the-meter-element-7