first-child selector
Description: Selects all elements that are the first child of their parent.
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version added: 1.1.4jQuery( ":first-child" )
While :first matches only a single element, the :first-child selector can match more than one: one for each parent. This is equivalent to :nth-child(1).
Example:
Finds the first span in each matched div to underline and add a hover state.
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