Редактирование кода:
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<!DOCTYPE html> <html> <head> <script src="/lib/jquery-1.12.2.min.js"></script> <script> $(document).ready(function(){ $("p:first").css("background-color", "yellow"); }); </script> </head> <body> <p>This is the first paragraph.</p> <p>This is the second paragraph.</p> <p>This is the last paragraph.</p> </body> </html>