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Find each liste item (li) that is a child (>) of an element with an ID of selected-id (#selected-id).
Negation pseudo-class
not

Find each list item that do not have a class of horizontal, which is a child of #selected-id.

XPath Selectors

This is a attribute selector, so use @ symbol inside square brackets. Example means that to select all links that have a title attribute.
Here are more examples about XPath Selectors.
Attribute selectors accept regular-expression-like syntax for identifying the beginning(^) or ending($) of a string. And also take an asterisk(*) to indicate an arbitrary position within a string.

href attribute begins with mailto

href attribute ends with .pdf.

href attribute has mysite.com inside.
Custom Selectors
I just put some sample here.

The most recommended complicated way.

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Sample 1.

$(document).ready(function() {
$('.poem').addClass('emphasized');
});</div>
It is the function to add class 'emphasized' on the class 'poem'.
Sample 2.
<div class="scode">$(document).ready(function() {
$('span:contains(language)').addClass('emphasized');
});

This sample try to find the span which contains “language”, and add a class ’emphasized’ on these span.

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$(document).ready(function(){
$("#commentForm").validate();
});

The latest vesion is 1.1.2
It has following features:
* Easy to setup
* 19 built-in validation methods, more in addition
* Inline-error-message display (no more alerts!), heavily customizable
* Extensible: Add your own validation methods and reuse them
* Use inline metadata or plugin options to specify your validation rules
* Carefully designed interaction: Doesn’t annoy users with errors they hadn’t a chance to fix, but gives them feedback as early as possible when fixing errors, via filtered keyup and blur events on each field
Validation home site

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For me, I just choose the jQuery, which can save my learning time.
How about you?

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