new states for meter element

Hi.

HTML5 introduced meter element [1], which is basically a progressbar role
but can be in special states:

1) optimal state when value is in optimal rage  (for example, if  low <
optimum < high then value should be in [low, high], if optimum > high then
value should be greater than high.

2) suboptimal state when value is in range next to optimum range (for
example, if low < optimum < high then value < low is suboptimal.

3) subsuboptimal state when value is not neither optimal nor suboptimal for
example if optimum > high but value < low.

Firefox colors these states as green/yellow/red.

Would it be reasonable to introduce these states in ATK? Any other ways to
expose that info?

[1]
http://www.whatwg.org/specs/web-apps/current-work/multipage/the-button-element.html#the-meter-element

Mozilla bug https://bugzilla.mozilla.org/show_bug.cgi?id=559770
Some examples: http://peter.sh/examples/?/html/meter-progress.html
Try it out: http://www.w3schools.com/tags/tryit.asp?filename=tryhtml5_meter

Thanks.
Alex.

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