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<!DOCTYPE html> <html> <head> <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js"></script> <script> $(document).ready(function(){ $("button").click(function(){ alert($(".hot").index($("#favorite"))); }); }); </script> </head> <body> <p>Click the button to get the index of the element with id="favorite", relative to the jQuery selector (class="hot"):</p> <button>Get index</button> <ul> <li>Milk</li> <li class="hot">Tea</li> <li class="hot" id="favorite">Coffee</li> </ul> </body> </html>
