:contains() Selector

Select all elements that contain the specified text.

event.relatedTarget

The other DOM element involved in the event, if any.

:first-child Selector

Selects all elements that are the first child of their parent.

:has() Selector

Selects elements which contain at least one element that matches the specified selector.

jQuery.isXMLDoc()

Check to see if a DOM node is within an XML document (or is an XML document).

:last-child Selector

Selects all elements that are the last child of their parent.

:nth-child() Selector

Selects all elements that are the nth-child of their parent.

:only-child Selector

Selects all elements that are the only child of their parent.

.slice()

Reduce the set of matched elements to a subset specified by a range of indices.

@jQuery API