Is it possible to remove the attribute of the first HTML
To remvove it from literally the first element use .removeAttr():
$(":first").removeAttr("style");
or in this case .show() will show the element by removing the display
property:
$(":first").show();
Though you probably want to narrow it down to inside something else, for example:
$("#container :first").removeAttr("style");
If you want to show the first hidden one, use :hidden as your selector:
$(":hidden:first").show();