hi guys,
I would like to know is querySelector supported by all browsers? is not what's alternate for it to use?
I have tested it with IE8, FF3, Chrome 4. Its fine for me. I do not have old browsers. So i would like to know if old browsers will give problem to me or not?
QuerySelector is supported on Firefox 3.1+, IE8+ (only in IE8 standards mode), and Safari 3.1+ browsers.
The best alternative is to use a third-party library that abstracts all that nasty browser-specific code away, like YUI or jQuery (I'm not as familiar with Prototype et al, so I can't say for sure if it uses the query* methods [when available]).
IE7< don't support it and IIRC IE8 has issues with namespaces. There's at least one more esoteric browser out there with major issues but I don't recall which it is.
Basically there is no unified expression-based DOM method, and absolutely your best bet is to use a library (the ubiquitous "use jquery" answer, but you should at least check out Sizzle if you have a problem with large libraries) because rolling your own is more effort than reasonably worthwhile (I speak from experience).