fix(matches-selector): don't call matches function if none exist on t…

…he element (#1613)

* fix(find-up): fix IE11 to not pass document element to matchesSelector

* fix test

lib/commons/dom/find-up.js

@@ -52,6 +52,10 @@ dom.findUpVirtual = function(element, target) {
 		parent !== document.documentElement
 	);
 
+	if (!parent) {
+		return null;
+	}
+
 	if (!axe.utils.matchesSelector(parent, target)) {
 		return null;
 	}

lib/core/utils/element-matches.js

@@ -34,6 +34,10 @@ axe.utils.matchesSelector = (function() {
 			method = getMethod(node);
 		}
 
-		return node[method](selector);
+		if (node[method]) {
+			return node[method](selector);
+		}
+
+		return false;
 	};
 })();

test/core/utils/element-matches.js

@@ -49,4 +49,22 @@ describe('utils.matchesSelector', function() {
 
 		fixture.innerHTML = '';
 	});
+
+	it('should return false if the element does not have a matching method', function() {
+		var target,
+			fixture = document.getElementById('fixture');
+
+		fixture.innerHTML = '<div id="test">Hi</div>';
+		target = document.getElementById('test');
+
+		target.matches = null;
+		target.matchesSelector = null;
+		target.mozMatchesSelector = null;
+		target.webkitMatchesSelector = null;
+		target.msMatchesSelector = null;
+
+		assert.isFalse(matchesSelector(target, '#test'));
+
+		fixture.innerHTML = '';
+	});
 });