modisposition

Update I completely re-wrote the test suite. You can check a live example here where results are compared with Sizzle selector engine against the common W3C page. After this Ajaxian post and some opinion exchange in its comments, I decided to extract the css2xpath function I used inside experiments in vice-versa project , creating a separated project specific for this purpose that some how could be interesting or useful. Bugs, problems, questions, and helps are more than welcome, so far I focused my attention to SlickSpeed test selectors and nothing else but at least for that it seems to be stable and reliable.

I am putting some effort to make vice-versa project a good, production ready, alternative against common libraries, and since these days I am working hard with XML, XSL(T), and XPath I decided to try an experiment implementing CSS to XPath translator for FireFox 3.0 With version 3.1 we will have querySelector and querySelectorAll but version 3.0 is still the most used one, FireFox speaking! The nightly build of vice-versa introduces a new file, mainly used for personal experiments via vice-versa library and the first experiment is an improved document.query for those browsers with document.evaluate support without document.querySelectorAll . Unfortunately Internet Explorer SlickSpeed Selector Speed Test comparing latest version of each library such Dojo , DOMAssistant , Sizzle (congrats for the new site!), Sly , and finally vice-versa project. Here the summary, from faster to slower: vice-versa 760ms Dojo 1.3.1 868ms (2 tests failed) DOMAssistant 880ms (good stuff Robert!)...