Oops, the sourceIndex of the documentElement in IE is 1, not 0.

diff --git a/src/selector.js b/src/selector.js
index bc898e1..5712f57 100644 (file)
--- a/src/selector.js
+++ b/src/selector.js
@@ -671,7 +671,7 @@ if ( document.documentElement.compareDocumentPosition ) {
                }
                return ret;
        };
-} else if ( document.documentElement.sourceIndex === 0 ) {
+} else if ( document.documentElement.sourceIndex === 1 ) {
        sortOrder = function( a, b ) {
                var ret = a.sourceIndex - b.sourceIndex;
                if ( ret === 0 ) {