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Selectors

Element.matches()

Check if an element would be selected by a particular selector or set of selectors. Returns true if the element is a match, and false when it’s not.

var elem = document.querySelector('#sandwich');
if (elem.matches('.turkey')) {
	console.log('It matches!');
} else {
	console.log('Not a match... =(');
}

Implemented with vendor prefixes in a handful of browsers. Use with a polyfill.