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<!DOCTYPE html> <html> <head> <script src="/lib/jquery-1.12.2.min.js"></script> <script> $(document).ready(function(){ $("button").click(function(){ alert("Image width: " + $("img").attr("width")); }); }); </script> </head> <body> <img src="img_pulpitrock.jpg" alt="Pulpit Rock" width="284" height="213"><br> <button>Return the width of the image</button> </body> </html>