diff --git a/src/validate/html/a11y.ts b/src/validate/html/a11y.ts
index bf58147350..df1a644bf6 100644
--- a/src/validate/html/a11y.ts
+++ b/src/validate/html/a11y.ts
@@ -27,17 +27,19 @@ export default function a11y(
 
 	const attributeMap = new Map();
 	node.attributes.forEach((attribute: Node) => {
+		const name = attribute.name.toLowerCase();
+
 		// aria-props
-		if (attribute.name.startsWith('aria-')) {
+		if (name.startsWith('aria-')) {
 			if (invisibleElements.has(node.name)) {
 				// aria-unsupported-elements
 				validator.warn(`A11y: <${node.name}> should not have aria-* attributes`, attribute.start);
 			}
 
-			const name = attribute.name.slice(5);
-			if (!ariaAttributeSet.has(name)) {
-				const match = fuzzymatch(name, ariaAttributes);
-				let message = `A11y: Unknown aria attribute 'aria-${name}'`;
+			const type = name.slice(5);
+			if (!ariaAttributeSet.has(type)) {
+				const match = fuzzymatch(type, ariaAttributes);
+				let message = `A11y: Unknown aria attribute 'aria-${type}'`;
 				if (match) message += ` (did you mean '${match}'?)`;
 
 				validator.warn(message, attribute.start);
@@ -45,7 +47,7 @@ export default function a11y(
 		}
 
 		// aria-role
-		if (attribute.name === 'role') {
+		if (name === 'role') {
 			if (invisibleElements.has(node.name)) {
 				// aria-unsupported-elements
 				validator.warn(`A11y: <${node.name}> should not have role attribute`, attribute.start);
@@ -61,10 +63,15 @@ export default function a11y(
 			}
 		}
 
+		// no-access-key
+		if (name === 'accesskey') {
+			validator.warn(`A11y: Avoid using the accessKey attribute`, attribute.start);
+		}
+
 		attributeMap.set(attribute.name, attribute);
 	});
 
-	function shouldHaveOneOf(attributes: string[], name = node.name) {
+	function shouldHaveAttribute(attributes: string[], name = node.name) {
 		if (attributes.length === 0 || !attributes.some((name: string) => attributeMap.has(name))) {
 			const article = /^[aeiou]/.test(attributes[0]) ? 'an' : 'a';
 			const sequence = attributes.length > 1 ?
@@ -97,11 +104,11 @@ export default function a11y(
 		shouldHaveContent();
 	}
 
-	if (node.name === 'img') shouldHaveOneOf(['alt']);
-	if (node.name === 'area') shouldHaveOneOf(['alt', 'aria-label', 'aria-labelledby']);
-	if (node.name === 'object') shouldHaveOneOf(['title', 'aria-label', 'aria-labelledby']);
+	if (node.name === 'img') shouldHaveAttribute(['alt']);
+	if (node.name === 'area') shouldHaveAttribute(['alt', 'aria-label', 'aria-labelledby']);
+	if (node.name === 'object') shouldHaveAttribute(['title', 'aria-label', 'aria-labelledby']);
 	if (node.name === 'input' && getStaticAttributeValue(node, 'type') === 'image') {
-		shouldHaveOneOf(['alt', 'aria-label', 'aria-labelledby'], 'input type="image"');
+		shouldHaveAttribute(['alt', 'aria-label', 'aria-labelledby'], 'input type="image"');
 	}
 
 	// heading-has-content
@@ -113,6 +120,11 @@ export default function a11y(
 		}
 	}
 
+	// iframe-has-title
+	if (node.name === 'iframe') {
+		shouldHaveAttribute(['title']);
+	}
+
 	if (node.name === 'figcaption') {
 		const parent = elementStack[elementStack.length - 1];
 		if (parent) {
diff --git a/test/validator/samples/a11y-iframe-has-title/input.html b/test/validator/samples/a11y-iframe-has-title/input.html
new file mode 100644
index 0000000000..2b5060b80e
--- /dev/null
+++ b/test/validator/samples/a11y-iframe-has-title/input.html
@@ -0,0 +1 @@
+<iframe src='{{src}}'></iframe>
\ No newline at end of file
diff --git a/test/validator/samples/a11y-iframe-has-title/warnings.json b/test/validator/samples/a11y-iframe-has-title/warnings.json
new file mode 100644
index 0000000000..8f69f14415
--- /dev/null
+++ b/test/validator/samples/a11y-iframe-has-title/warnings.json
@@ -0,0 +1,10 @@
+[
+	{
+		"message": "A11y: <iframe> element should have a title attribute",
+		"loc": {
+			"line": 1,
+			"column": 0
+		},
+		"pos": 0
+	}
+]
diff --git a/test/validator/samples/a11y-no-access-key/input.html b/test/validator/samples/a11y-no-access-key/input.html
new file mode 100644
index 0000000000..3191d1479e
--- /dev/null
+++ b/test/validator/samples/a11y-no-access-key/input.html
@@ -0,0 +1 @@
+<div accessKey='z'></div>
\ No newline at end of file
diff --git a/test/validator/samples/a11y-no-access-key/warnings.json b/test/validator/samples/a11y-no-access-key/warnings.json
new file mode 100644
index 0000000000..fe09930c29
--- /dev/null
+++ b/test/validator/samples/a11y-no-access-key/warnings.json
@@ -0,0 +1,8 @@
+[{
+	"message": "A11y: Avoid using the accessKey attribute",
+	"loc": {
+		"line": 1,
+		"column": 5
+	},
+	"pos": 5
+}]
\ No newline at end of file