FYI, be careful of using any spacing to make code readable in your text editor. The spacing might affect processing.

Here is one that bothered me for about an hour, until I got lucky and just removed the space.

These two statements are not the same.

1. $("#myid [value=1][name=2]")

2. $("#myid [value=1] [name=2]")

The additional space causes the filter to not work.