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Shaun Inman has an interesting blog post proposing CSS parent selectors. Something a lot of people (including me) have been begging for. The proposal on the surface looks good and sound, but when you dig into the comments, apparently it’s a lot more complicated. Take particular note of the responses from Dave Hyatt, he’s the lead developer on Webkit. You find out why it’s not something that will be implemented, and surprisingly (at least to me), how CSS selectors in general can get expensive in terms of performance. Especially for large scale web apps.