I found this website which has done a great job writing some detection functions for some of the new html5 capabilities. Perhaps this is something that could be added to jQuery.support? I don't know the policies for inclusions, perhaps it's something you rather see people include themselves. However, I thought I'd post a notice here in case it hasn't been discovered already:
http://diveintohtml5.org/detect.html#input-types one example: function supports_input_placeholder() { var i = document.createElement('input'); return 'placeholder' in i; }
