Child Selector ("parent> child")
Selects all direct child elements specified by "child" of elements specified by "parent".
.child(parent, child)
parent
Selector Any valid selector.
child
Selector A selector to filter the child elements.The child combinator (E > F) can be thought of as a more specific form of the descendant combinator (E F) in that it selects only first-level descendants.
Places a border around all list items that are children of <ul class="topnav"> .
JS
<ul class="topnav">
<li>Item 1</li>
<li>
Item 2
<ul>
<li>Nested item 1</li>
<li>Nested item 2</li>
<li>Nested item 3</li>
</ul>
</li>
<li>Item 3</li>
</ul>
CSS
body {
font-size: 14px;
}
HTML
$("ul.topnav> li").css("border", "3px double red");
DEMO