Features Available:

CSS3
Selectors (entire module and ::selection)
Namespaces (all except attribute selectors)
Backgrounds & Borders
Color (rgba(), opacity)
DOM Core Namespaces
DOM Range
DOM L2 Events
Event registration and dispatch APIs (addEventListener, removeEventListener, createEvent, dispatchEvent)
Event bubble and target phases
New event objects (Event, UIEvent, MouseEvent, etc.)
DOM L3 Events
CustomEvent, KeyboardEvent, DragEvent interfaces
HTML5 Selection
XHTML Documents
SVG
The SVG in IE is based upon the SVG 1.1 2nd Edition Full
Most document structure, scripting (eventing) and styling (inline and through CSS) is functional
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