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jQuery :first-child Selector
The :first-child selector in jQuery is used to select all elements, which are the first child of their parent.
Syntax
The syntax is as follows −
$(":first-child")
Example
Let us now see an example to implement the :first-child() selector −
<!DOCTYPE html> <html> <head> <style> .demo { background-color: red; color: white; font-size: 16px; border: 2px blue dashed; } </style> <script src="https://code.jquery.com/jquery-3.4.1.js"></script> <script> $(document).ready(function(){ $("p:first-child").addClass("demo"); }); </script> </head> <body> <p>This is the first line!</p> <p>This is the second line!</p> <p>This is the third line!</p> <hr> <div> <p>One</p> <p>Two</p> <p>Three</p> <p>Four</p> </div> <hr> <p>This is the last line.</p> </body> </html>
Output
This will produce the following output −
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