You can clone with
HTTPS or Subversion.
Try in IE6, for example:
Note: IE8 does this correctly, so qSA is not affected.
css-escapes: Fix IE issues #11 and #12
Only escape `_` at the start of an identifier. (#11)
Escape `:` as `\3a ` instead of `\:` for better IE < 8 support. (#12)