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<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <title>jQuery Select Element by ID</title> <script src="https://code.jquery.com/jquery-3.6.0.min.js"></script> <script> $(document).ready(function(){ // Highlight element with id mark $("#mark").css("background", "yellow"); }); </script> </head> <body> <p id="mark">This is a paragraph.</p> <p>This is another paragraph.</p> <p>This is one more paragraph.</p> <p><strong>Note:</strong> The value of the id attribute must be unique in an HTML document.</p> </body> </html>