Returns true, because the parent of the input is a form element

Edit code and click me	Your Result (Some examples do not work in Google Chrome):
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <script src="http://code.jquery.com/jquery-1.5.js" type="text/javascript"></script> <script type="text/javascript" language="javascript"> $(document).ready(function(){ var isFormParent = $("input[type='checkbox']").parent().is("form") $("div").text("isFormParent = " + isFormParent); }); </script> <style>div { color:red; }</style> </head> <body> <form><input type="checkbox" /></form> <div></div> </body> </html>
Edit the code above and click to see the result	www.xhtml.co.il - Try it yourself