问题
Y.one('form fieldset:nth-child(2)').toggleClass('hide');
in chrome, FF, opera this line works but in ie6-8 it throws an error 'Y.one(...)' is null or not an object.
where is the problem?
回答1:
Have to add the "selector-css3" module to your .use() statement if you want to use CSS3 selectors in browsers that don't support them natively.
来源：https://stackoverflow.com/questions/3713263/yui3-selector-problem-in-ie8