fix: Allow live-region and dialog in region rule

lib/checks/navigation/region.js

@@ -25,27 +25,32 @@ function isSkipLink(vNode) {
 }
 
 // Check if the current element is a landmark
-function isLandmark(virtualNode) {
-	var node = virtualNode.actualNode;
-	var explictRole = (node.getAttribute('role') || '').trim().toLowerCase();
+function isRegion(virtualNode) {
+	const node = virtualNode.actualNode;
+	const explicitRole = axe.commons.aria.getRole(node, { noImplicit: true });
+	const ariaLive = (node.getAttribute('aria-live') || '').toLowerCase().trim();
 
-	if (explictRole) {
-		return landmarkRoles.includes(explictRole);
-	} else {
-		// Check if the node matches any of the CSS selectors of implicit landmarks
-		return implicitLandmarks.some(implicitSelector => {
-			let matches = axe.utils.matchesSelector(node, implicitSelector);
-			if (node.tagName.toLowerCase() === 'form') {
-				let titleAttr = node.getAttribute('title');
-				let title =
-					titleAttr && titleAttr.trim() !== ''
-						? axe.commons.text.sanitize(titleAttr)
-						: null;
-				return matches && (!!aria.labelVirtual(virtualNode) || !!title);
-			}
-			return matches;
-		});
+	if (explicitRole) {
+		return explicitRole === 'dialog' || landmarkRoles.includes(explicitRole);
 	}
+	// Ignore content inside of aria-live
+	if (['assertive', 'polite'].includes(ariaLive)) {
+		return true;
+	}
+
+	// Check if the node matches any of the CSS selectors of implicit landmarks
+	return implicitLandmarks.some(implicitSelector => {
+		let matches = axe.utils.matchesSelector(node, implicitSelector);
+		if (node.tagName.toLowerCase() === 'form') {
+			let titleAttr = node.getAttribute('title');
+			let title =
+				titleAttr && titleAttr.trim() !== ''
+					? axe.commons.text.sanitize(titleAttr)
+					: null;
+			return matches && (!!aria.labelVirtual(virtualNode) || !!title);
+		}
+		return matches;
+	});
 }
 
 /**
@@ -55,7 +60,7 @@ function findRegionlessElms(virtualNode) {
 	const node = virtualNode.actualNode;
 	// End recursion if the element is a landmark, skiplink, or hidden content
 	if (
-		isLandmark(virtualNode) ||
+		isRegion(virtualNode) ||
 		isSkipLink(virtualNode) ||
 		!dom.isVisible(node, true)
 	) {

test/checks/navigation/region.js

@@ -211,6 +211,35 @@ describe('region', function() {
 		assert.isTrue(checks.region.evaluate.apply(checkContext, checkArgs));
 	});
 
+	it('allows content in aria-live=assertive', function() {
+		var checkArgs = checkSetup(
+			'<div aria-live="assertive" id="target"><p>This is random content.</p></div>'
+		);
+		assert.isTrue(checks.region.evaluate.apply(checkContext, checkArgs));
+	});
+
+	it('allows content in aria-live=polite', function() {
+		var checkArgs = checkSetup(
+			'<div aria-live="polite" id="target"><p>This is random content.</p></div>'
+		);
+		assert.isTrue(checks.region.evaluate.apply(checkContext, checkArgs));
+	});
+
+	it('does not allow content in aria-live=off', function() {
+		var checkArgs = checkSetup(
+			'<div aria-live="off" id="target"><p>This is random content.</p></div>'
+		);
+		assert.isFalse(checks.region.evaluate.apply(checkContext, checkArgs));
+	});
+
+	it('treats role=dialog elements as regions', function() {
+		var checkArgs = checkSetup(
+			'<div role="dialog" id="target"><p>This is random content.</p></div>'
+		);
+
+		assert.isTrue(checks.region.evaluate.apply(checkContext, checkArgs));
+	});
+
 	(shadowSupport.v1 ? it : xit)('should test Shadow tree content', function() {
 		var div = document.createElement('div');
 		var shadow = div.attachShadow({ mode: 'open' });