no-distracting-elements

src/validate/html/a11y.ts

@@ -130,6 +130,11 @@ export default function a11y(
 		shouldHaveAttribute(['title']);
 	}
 
+	// no-distracting-elements
+	if (node.name === 'marquee' || node.name === 'blink') {
+		validator.warn(`A11y: Avoid <${node.name}> elements`, node.start);
+	}
+
 	if (node.name === 'figcaption') {
 		const parent = elementStack[elementStack.length - 1];
 		if (parent) {

test/validator/samples/a11y-no-distracting-elements/input.html

@@ -0,0 +1,2 @@
+<marquee/>
+<blink/>

test/validator/samples/a11y-no-distracting-elements/warnings.json

@@ -0,0 +1,19 @@
+[
+	{
+		"message": "A11y: Avoid <marquee> elements",
+		"loc": {
+			"line": 1,
+			"column": 0
+		},
+		"pos": 0
+	},
+
+	{
+		"message": "A11y: Avoid <blink> elements",
+		"loc": {
+			"line": 2,
+			"column": 0
+		},
+		"pos": 11
+	}
+]