This post seems to completely miss the point of selectors and how you can match classnames and use pseudo selectors. This isn't a bug in jQuery at all, but just

This post seems to completely miss the point of selectors and how you can match classnames and use pseudo selectors. This isn't a bug in jQuery at all, but just the way css selectors work. Especially telling is this phrase: Here are some examples of invalid selectors in jQuery because they contain invalid characters: $( "#person.name" ).addClass( "highlight" ); // FAIL This is of course a perfectly valid selector, selecting a node that has both the id person and the class name. Saying that the selector is invalid is simply wrong.