var sortOrder;
-if ( Array.prototype.indexOf ) {
- var indexOf = Array.prototype.indexOf,
- allSort = document.getElementsByTagName("*");
-
+if ( document.documentElement.compareDocumentPosition ) {
sortOrder = function( a, b ) {
- var ret = indexOf.call( allSort, a ) - indexOf.call( allSort, b );
+ var ret = a.compareDocumentPosition(b) & 4 ? -1 : a === b ? 0 : 1;
if ( ret === 0 ) {
hasDuplicate = true;
}
return ret;
};
-} else if ( document.documentElement.sourceIndex === 1 ) {
+} else if ( "sourceIndex" in document.documentElement ) {
sortOrder = function( a, b ) {
var ret = a.sourceIndex - b.sourceIndex;
if ( ret === 0 ) {
}
return ret;
};
+} else if ( document.createRange ) {
+ sortOrder = function( a, b ) {
+ var aRange = a.ownerDocument.createRange(), bRange = b.ownerDocument.createRange();
+ aRange.selectNode(a);
+ aRange.collapse(true);
+ bRange.selectNode(b);
+ bRange.collapse(true);
+ var ret = aRange.compareBoundaryPoints(Range.START_TO_END, bRange);
+ if ( ret === 0 ) {
+ hasDuplicate = true;
+ }
+ return ret;
+ };
}
// Check to see if the browser returns elements by name when