A few months ago, I blogged that Internet Explorer 8 beta 2 was not using standard syntax for WAI-ARIA properties. The syntax actually varied depending on the mode chosen for the page, which was confusing. Sometimes the standard worked, and other times you had to use non-standard camelCase for WAI-ARIA.
Microsoft has listened and is correcting WAI-ARIA property support in IE 8 RC1. Here’s a big thank you. It’s important to have a healthy portion of WAI-ARIA work the same across both browsers. Many look forward to test-driving the WAI-ARIA support in IE 8 final.