baby steps

src/compile/nodes/Element.ts

@@ -473,7 +473,9 @@ export default class Element extends Node {
 					});
 				}
 
-				if (checkTypeAttribute() !== 'checkbox') {
+				const type = checkTypeAttribute();
+
+				if (type !== 'checkbox' && type !== 'radio') {
 					component.error(binding, {
 						code: `invalid-binding`,
 						message: `'${name}' binding can only be used with <input type="checkbox">`

test/runtime/samples/binding-input-radio-checked/_config.js

@@ -20,7 +20,26 @@ export default {
 
 		<p>foo false</p>
 		<p>bar true</p>
-		<p>baz false</p>`,
+		<p>baz false</p>
+	`,
+
+	ssrHtml: `
+		<label>
+			<input type="radio" name="x"> foo
+		</label>
+
+		<label>
+			<input type="radio" name="x" checked> bar
+		</label>
+
+		<label>
+			<input type="radio" name="x"> baz
+		</label>
+
+		<p>foo false</p>
+		<p>bar true</p>
+		<p>baz false</p>
+	`,
 
 	test(assert, component, target, window) {
 		const inputs = target.querySelectorAll('input');
@@ -31,6 +50,7 @@ export default {
 		const event = new window.Event('change');
 
 		inputs[0].checked = true;
+		assert.equal(inputs[1].checked, false);
 		inputs[0].dispatchEvent(event);
 
 		assert.htmlEqual(target.innerHTML, `