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### Traversing

    $('.box')
      .children()
      .closest('div')
      .filter(':selected')
      .find('div')
      .has('div')
      .first()
      .next('div')
      .nextUntil('div')

## Advanced features

### Extending selectors

    $.expr[':'].inline = function (el) {
      return $(el).css('display') === 'inline'
    }

Enables `$(':inline')`

### Extend CSS properties

    $.cssHooks.someCSSProp = {
      get: function (elem, computed, extra) {
      },
      set: function (elem, value) {
      }
    }

    // Disable "px"
    $.cssNumber["someCSSProp"] = true

### fn.animate() hooks

    $.fn.step.someWhatever = function(fx) {
      // ...
    }

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