I discovered using the autocomplete plugin with jQuery 1.4a1 that it goes into a recursive infinite loop upon initialization. The cause was this line:

$(input).attr('autocomplete', 'off')

Since $.fn.autocomplete exists, this line actually calls $(input).autocomplete('off') for some reason. It seems the only way to set the 'autocomplete' attribute is with this workaround:

$(input).each(function(){ this.autocomplete = 'off' });

The new code that causes this problem is in jQuery.attr:

if ( name in jQuery.fn && name !== "attr" ) {

return jQuery(elem)[name](value);

}

Perhaps this is expected behaviour, but I can imagine it will cause problem with other plugins that have attribute-matching plugin names.