can you explain your code(Dropdown)?How is it work?

$("html").click(function() {

// Any nav item that is not an only child...
$("nav ul li a:not(:only-child)").click(function(e) {
	// will be toggled.

	// Opening a new dropdown will collapse any other dropdown.

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Accepted Answer

$(.dropdown;)... is targeting an element in your DOM with a class of .dropdown

example: <div class="dropdown"></div>