- From: Matthew Raymond <mattraymond@earthlink.net>
- Date: Sun, 24 Sep 2006 09:25:04 -0400
- To: Mihai Sucan <mihai.sucan@gmail.com>
- CC: www-style@w3.org
Let me see if I understand this right. Here's an example from the email you link too: | input[type="radio"] < form:not(input[type="radio"]:checked < form) Here, "<" is the parent selector, so your :parent pseudo-class is pretty much "< *". If we wanted to use :parent to reproduce the above example, we could to the following: | form > input[type="radio"]:not(:checked):parent The problem here is that you have to check all of the parent's children to see if they match the part of the selector before :parent, which strikes me as a serious performance hit. On top of this, it could be recursive: | element1 > element2 > element3 > element4:parent:parent:parent In the above, the user agent has to check every child of every element in the chain. If you assume that each element has just two children, then you're checking 2 + 4 + 8 (14) nodes.
Received on Sunday, 24 September 2006 13:25:20 UTC