How do you remove <li> from a <ul> by Id?

Try this:

$('#secondli').remove();

In jQuery, you refer to the ID of an element with a # in front of it. See http://api.jquery.com/id-selector/

This will work for you

$('#secondli').remove();

You need to add a space between the select the li element,

$('#second li').remove(); // when referencing by id

$(".second li").remove(); // when referencing by class

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