data attribute retrieve method doesn't work

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when yo set data attribute html5 using this way:
$('#element').data('some-att-name', value); 

 it doesn't work to retrieve with this method: $("ul").find("[data-slide='" + current + "']"); so you need use the classic method to add a attribute:

 $('<li>'+name+'</li>').attr('data-name',name);

this note appears in small letters in a stack overflow question.

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