How can I remove all CSS classes using jQuery/JavaScript?

$("#item").removeClass();

Calling removeClass with no parameters will remove all of the item’s classes.

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You can also use (but it is not necessarily recommended. The correct way is the one above):

$("#item").removeAttr('class');
$("#item").attr('class', '');
$('#item')[0].className = '';

If you didn’t have jQuery, then this would be pretty much your only option:

document.getElementById('item').className = '';