Accessing the IE-proprietary filters collection in JavaScript fails; CSS repeating background image fail to cover the whole element, often leaving one transparent pixel uncovered on edges; setting CSS height and width in scripted animations leaves dirty artifacts due to incorrect redraw optimizations; and -- most disturbing -- IE8's CSS 2.1 standards implementation seems to have regressed. Pages that worked in Firefox, Safari/Chrome, Opera, and IE 8 Beta 2 fail in IE 8 RC1.