See: Description
| Class | Description | 
|---|---|
| AdjacentSiblingCombinator | 
 An adjacent sibling combinator selects by checking the widget immediate sibling. 
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| AndCombinator | 
 An 'and' combinator selects the widgets selected by both selectors. 
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| ChildCombinator | 
 A child combinator selects by checking the widget direct hierarchy. 
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| Combinator | 
 A combinator is a selector that aggregates two selectors. 
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| DescendantCombinator | 
 A descendant combinator selects by checking the widget hierarchy. 
 | 
| GeneralSiblingCombinator | 
 A general sibling combinator selects by checking the widget sibling. 
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