Still really depends which browsers you do want to target. Still plenty of things to look out for.
Here's a list of unsupported features in IE6 you can now use:
- child selector ( div > p )
- adjacent sibling selector ( h1 + p )
- general sibling selector ( h1 ~ p )
- chained class selectors (
.class1.class2 )
- attribute selector ( a[href] )
- descendant selector after :hover
pseudo-class ( div:hover span )
- chained pseudo-classes (
a:first-child:hover )
- :hover on non-anchor elements
- :first-child
- "virtual dimensions" (dimensions
determined by top, right, left,
bottom when position: absolute )
- min-height, min-width
- max-height, max-width
- transparent border color
- position: fixed
- background-attachment: fixed works
only on the root element
A really good resource you can look at is http://caniuse.com/ for viewing what is supported where.
And finally - a list of IE6 bugs that were fixed in IE7 - more info here
- basic alpha-transparent png support
- css child selector
- !important more properly works
- :first-letter support
- partial click bug
- window.XMLHttpRequest became present,
instead of ActiveXObject
- abbr tag is recognized
- select z-index bug is resolved as
it's become window-less
