Convert all xpath selectors to css selectors when possible

[gabriellima]

They're faster. One thing I can't ensure about them is the possibility to find parent given a child, like on:

//td/../../table

or something like that. But I also think that css selector has another way to do this, by using :parent, or something like that.
Anyway, it's faster.

[gabriellima]

Looking closer, neither css2 nor css3 gives possibility to execute a "parent selection". So I think that, excepting the case when parent selector is needed, css selector's can be used.

According to Wikipedia:

Selectors are unable to ascend

CSS offers no way to select a parent or ancestor of element that satisfies certain criteria. A more advanced selector scheme (such as XPath) would enable more sophisticated stylesheets. However, the major reasons for the CSS Working Group rejecting proposals for parent selectors are related to browser performance and incremental rendering issues.

[bernardobarreto]

i'm working on it