Only use .children.tags() optimisation in IE.
Because opera has issue in XHTML mode, and all other non-IE browsers have issues as well.
1.1 --- a/src/selector.js Sat Oct 17 16:14:27 2009 +0200
1.2 +++ b/src/selector.js Sat Oct 17 16:23:15 2009 +0200
1.3 @@ -459,7 +459,7 @@
1.4 var aNodes,
1.5 oSimpleSelector = this.simpleSelectors[0],
1.6 iStart = 0;
1.7 - if (oNode.children && oNode.children.tags && !browser_webkit && oSimpleSelector instanceof TypeSelector) {
1.8 + if (browser_ie && oSimpleSelector instanceof TypeSelector) {
1.9 aNodes = oNode.children.tags(oSimpleSelector.arg1);
1.10 iStart++;
1.11 } else {