use opacity for disabled widgets in high contrast mode

[bill]

Disabled widgets in high contrast mode by-and-large appear the same as when they are enabled. It's because we generally use background-color and text-color to indicate disabled-ness, neither of which have meaning in high-contrast mode.

Becky suggested that we could set opacity (for example, to 50%) as a way to mark disabled buttons, textboxes, sliders, etc.

Usually opacity settings are bad because the page background then seeps through the widget, but that's not an issue in high-contrast mode because there is no background shown.

[Chris Mitchell]

reassign due to inactive committer. please triage accordingly.

[bill]

I tried setting opacity:

.dijit_a11y .dijitDisabled {
    opacity: 50%;
    #filter: alpha(opacity = 50);
    #zoom: 1;
}

It works for IE6, but not IE8 or FF4.

So, I'm going to close this, we can reopen if someone knows a way to do this.